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Future Prospects and Health Benefits of Functional Ingredients from Marine Bio-resources: A review
  • 비영리 CC BY-NC
  • 비영리 CC BY-NC
Future Prospects and Health Benefits of Functional Ingredients from Marine Bio-resources: A review
Marine Bio-resources , Biotechnology advances , Proteins , Molecular biology
  • Introduction

    The life of the earth has been originated from the ocean. The oldest fossil evidences showed that rise of environment oxygen by oxygen producing eukaryotes and cyanobacteria was appeared over 2.45-2.32 billion years ago (Rasmssen et al., 2008). Afterwards, many of organisms or evolutionary forms have been evolved from that primitive age to contemporary state by having extraordinary structural variations (Cracraft and Donoghue, 2005). On the other hand, abiotic factors such as light intensity, temperature, nutrients and salinity levels make much influence for their biological functions. Furthermore, extreme fluctuations of climate according to seasons have been given a major outbreak through the variations and to be survived in the competitive environmental conditions (Plaza et al., 2008). However, the evolution of the diverging forms with respect to their biochemical and morphological traits are still being taking place with the adaptive establishments in the ocean. In that case, marine bacteria, fungi, sponges, algae (macro or micro), crustaceans, mollusks, fish and small vertebrates have been identified as the major classes that comprise the diversity of marine biomass. As the consequences of this diversity, biochemically and ecologically significant differences have brought with the vast marine biomasses and have been associated with a broad spectrum of secondary metabolites. However, the significant gains are continually being improved due to the exploration of novel secondary metabolites from the ocean. Therefore, it is logical to consider that mining of natural products and functional ingredients from the marine biomasses would be a productive commencement in the view point of pharmacology (Imhoff et al., 2011).

    There has been existed long tradition of consuming seafood as a delicacy along with the human diet for many centuries, (Kim and Wijesekara, 2010). Ancient people in many parts of the world would have believed that the steady enhancement of life expectancy and long term health effects, quality and care could be rendered by the marine functional ingredients. Consumption of seafood is considered as a preventive strategy against lifestyle diseases and fruitful solution for the prospective health challenges. Moreover, substantial scientific evidences have been shown that direct consumption of seafood or food supplements may contribute for the health promoting effect (Cencic and Chingwaru, 2010). A sufficient intake of seafood nutrients has been linked for preventing chronic heart disease and relieving from many more health problems. In addition, largely derived human clinical studies have encompassed the vast array of health benefits from marine foods (Hu et al., 2002; Marchioli, 2003; Lavie, 2009). Furthermore, seafood commodities including fish, shellfish and seaweeds are commonly used for delicacies in many parts of the world and highly demanded natural comestibles in the global food market. This can be well understood by the tremendous diversity of the seafood and their nutritional characteristics including poly unsaturated fatty acids (PUFA) such as eicosapentaenoic acids (EPA) and docosahexaenoic acids (DHA) (Lichtenstein et al., 2006; Elvevoll et al., 2008) as well as proteins (Friedman, 1996; Kitts and Weiler, 2003; Samarakoon and Jeon 2012), bioactive peptides (Kawasaki et al., 2000; Kim and Wijesekara, 2010), free amino acids (Elvevoll et al., 2008; Petrosian and Haroutounian, 2009), enzymes (Fernandes, 2010), vitamins (Holick, 2009), minerals (Andersson et al., 2010; Zimmermann, 2010) and other functional ingredients (Kanazawa, 2001; Heo et al., 2005; Wu et al., 2009) which are proven to play significant beneficial roles in human health (Lavigne et al., 2001; Boukortt et al., 2004; Cohen et al, 2005; Elvevoll et al., 2008; Undeland et al., 2009).

    The exploration of marine bio-resources is an indefinite challenge for bio-mining researchers. However, the immersing diversity of marine environment has revealed that the untapped resources are having broad probe to meet the curiosity of the future scientific community. Therefore, this endeavor leads to overview the recent biotechnological aspects on valuable health products, mainly marine proteins and lipids from marine bio-resources through the future prospects, with respect to their increasing sustainability. Hence, this biotechnological and pharmacological scenario will be emphasized due to increasing demands on the marine bio-resources, in order to 276strengthen the development of marine functional foods, nutraceuticals and associated medicinal benefits.

    Possible applications on extractions and isolation of functional ingredients

    Marine functional materials can elicit positive health benefits with long term efficacy. Therefore, these materials are believed to be implemented a novel strategy for the functional foods in the marine biotechnology. Over the many years, a vast array of structural and biochemical diversity in terms of the various marine organisms might have targeted for the screening projects (Plaza et al., 2008). Effective ways of screening, bio-mining and advancing of bioactive natural products using appropriate techniques, in order to commercialize the respective products are highly concerned matters in the modern field of marine biotechnology. Furthermore, the development of functional materials for the functional foods and identification of possible extraction methods are performed with the respective parameters such as heat resistance, solubility, molecular weights. In this regard, two possible extraction methods are described preliminary, designated as enzymatic hydrolysation and organic solvent extraction (Kim and Wijesekara, 2010). Even though numerous extraction methods are currently employed, only few of them are suitable for industrial scale. In addition, solid-liquid extraction (SLE), liquid-liquid extraction (LLE) and soxhlet extraction (SE) techniques are characterized as less economical strategies. Furthermore, high volumes of solvents should be used with long time proceedings in those procedures, which may in turn lead to remain toxic residues with the final extracts. Therefore, sophisticated green methodologies are described to increase the yield, purity and reproducibility of the target compounds (Wang et al., 2010). However, enzymatic hydrolysation can be preferred to isolate proteins, lipids and their bioactive constituents, with the safe, time and cost effective way from the heterogeneous sources. Despite the fact, chemical extractions (using organic solvents) are also applicable as a popular method to isolate bio-functional materials in the traditional way. For example, recovering of PUFA as free fatty acids from the marine oil followed by saponification, isolation, purification and crystallization techniques were performed depending on the solubility of the particular chemical and available distillation methods (Shahidi and Wanasundara, 1998). However, purification of proteins, mainly enzymes, peptides and free amino acids can be purified with the ultra-membrane filtration (UF), gel or size exclusive column chromatography and couple with the high performance liquid chromatography (HPLC). The mass determination and structure elucidations may further subjected using liquid chromatography-mass spectrophotometer (LC-MS) or mass-mass spectrophotometer (MS-MS) along with the nuclear magnetic resonance spectrophotometer (NMR) (Chabeaud et al., 2009).

    However, the commercialization of proteins and lipids would become an interesting view for the functional and medicinal industries as new chemical-entities for leadcompounds or innovative drugs from marine bio-resources. Therefore, in recent years, the pharmaceutical firms have a look towards the investigation and utilization of new isolation methodologies under optimized conditions, which would become efficient with respect to the time consumption and cost in industrial scale, rather than the laboratory-scale. The technological advances in industrial-scale (i.e. combining conventional membrane filtration with electrophoresis on separating highly charged bioactive peptides) might render fast separation rather than chromatography (Bargeman et al., 2002). In addition, the highest degree of technologies such as supercritical fluid extraction (SCFE), pressurized liquid extraction (PLE), pressurized hot water extraction (PHWE), accelerated solvent extraction (ASE) as well as ultrasound-assisted (UAE) and microwave-assisted (MAE) extraction have been used in recent marine bio-resource extractions and functional food formulations (Herrero et al., 2006a). Moreover, bioactivity guided fractionations lead to determine the fastest and accurate way to reach the last step of separation procedures. However, the sequential chromatographic steps involve further purification and characterization of innovative secondary metabolites from the marine natural sources. Moreover, the purified functional materials can be used to scale up the activities, testing the efficacy of in vitro assays, analytical techniques to quantify minor components and animal or human clinical studies may further needed to establish the health prospects before the development and commercialization (Fig. 1).

    Pharmacological and nutritional view of marine proteins and lipids

    The very long evolutional period of marine life than the terrestrial life has generated a massive biodiversity throughout the species at genomic level. Thus marine bio-resources are showing a broad spectrum of biomedical constituents. Therefore, it is believed that the vast number of reports have encountered the significances of medicinal effects from marine bio-resources (Dufosse et al.,2005; Ward and Singh, 2005; Zengler et al., 2005; Chang et al., 2008; Rodriguez et al., 2010; Ivanchina et al., 2011; Senni et al., 2011; Sperstad et al., 2011). Furthermore, various interests over the pharmacological and nutraceutical effects of the proteins including enzymes, peptides and free amino acids, and also lipids including saturated and unsaturated fatty acids from marine organisms will be discussed in the next part of this review.

    Marine proteins and protein-derived constituents

    Proteins, bioactive peptides and free amino acids derived from marine sources have gained a much attention due to promising health benefits (Samarakoon and Jeon, 2012). Basically most of the marine bio-resources are comprised of high content of proteins than the other functional materials. Interestingly, marine microalgae, muscle tissues of fish, shellfish and other invertebrates showed the range of 15-65% (w/w) proteins. In addition, marine fish and shellfish waste along with processing by-products are also considered to be consisted with high quality and quantities of proteins [10-23% (w/w)]. These sources are targeted as a potential source for mining of active components (Kim and Mendis, 2006; Harnedy and Fitzgerald, 2012). In fact, extractions of these proteins or protein-derived constituents from different sources have been extensively studied (Rutherfurd and Moughan, 2005). Usual extraction protocols of those proteins from organisms are initiated by the disruption of cells of the source and releasing proteins (Patil et al., 2008; Ko et al., 2011; Lee et al., 2011). However, the bioactivity of the proteins may not directly correlate with the intact form of parent proteins.

    Free forms of amino acids are also used in high levels of production of food supplements, energy formulations and nutraceuticals in the infant and adult food industries (Stapletonet al., 1997). Taurine and creatine are two main amino acids used commonly in those industries (Petrosian et al., 2009). In terms of the bio-functionalities of the taurine, it showed very high activity and found in most of the organisms as dominant free form. Furthermore these authors have reported that the both amine and sulphonic subunits of taurine can undergo ionization and involve in biological and physiological activities by their dissociation components. Moreover, they were known to be involved in antioxidative reactions (Métayer et al., 2008) immune stimulations (Redmond et al., 1998) homeostasis (Takahashi et al., 1997) cell membrane stabilizations (Han et al., 2000) anti-inflammatory (Chiarla and Giovannini, 2004) developmental regulation of renal functions (Han et al., 2000) endocrine and metabolic effects (Rose, 1996) in humans. In fact, raw flesh fish, raw clams and raw mussels are also known to contain high taurine levels, among the marine organisms (Stapleton et al., 1997). On the other hand, creatine is also being considered as an important free or phosphorylated form of amino acid that furnishes positive physiological effects for humans. Moreover, skeletal muscle regeneration, contraction by performing on cardial muscles (Gordon et al., 1995) and fat-free mass promotion (Sullivan et al., 2000) has also been encountered by creatine level in human body.

    Importantly, bioactive peptides showed much significant roles in the pharma-nutraceutical applications (Shahidi and Zhong, 2008). Marine food sources have exerted many of bioactive peptides and the peptide sequences may short and consisted of 3-20 amino acid residues. Therefore, isolation and purification of bioactive peptides could be described by facilitating upon the proteolytic enzyme hydrolysation and follow the activity guided fractionations (Sheih et al., 2009). Moreover, the composition and number of amino acid residues of the isolated peptides exert their bioactivity (Pihlanto-Leppala, 2001). Hence, the identified bioactivities have given a wide range of physiological applications.

    Most of these bioactive peptides have been obtained from enzymatic hydrolysation of marine organisms including algae, fish, shellfish (Suetsuna and Chen, 2001; Je et al., 2008) fermented marine food sources processed by microorganisms (Je et al., 2005; Je et al., 2008) and marine processing by-products (Kim et al., 2000; Kim et al., 2001). These peptides demonstrated the overall effect of the human health claims and the knowledge of the diet make the awareness of functional foods and nutraceuticals (Erdmannet et al., 2008; Elias et al., 2008; Samaranayaka and Li-Chan, 2011). Interestingly, bioactive peptides and amino acids may act as alternative molecules to small molecular drugs. Moreover, those have shown a great advantage over the conventional drugs with high bioavailability and bio-specificity to the targets. The desirable properties of these molecules, such as low toxicity, structural diversity and least or no accumulations in the body tissues have rendered the interest of many scientists to use for the therapeutic purposes. Furthermore, during the gastrointestinal digestion, bioactive peptides may not be broken down and can provoke the positive health effects that have confirmed by in vivo studies (Ko et al., 2012). Anti-ACE and anti-obesity studies have linked with the active peptides and mediated through stimulation of hormones and regulatory satiety. In addition, Quantitative Structure-Activity Relationship (QSAR), that is modeling information, can be used to predict the peptide structures with the ability to cross membrane barriers in the specific target sites (Jimsheena and Gowada, 2010). Furthermore, the improvement of the structures, stabilities and binding capacities of the bioactive peptides with the respective binding sites of human model systems incorporation with synthetic peptides can be strengthen the knowledge of peptides.

    Enzymes based biotechnologies have been emphasized and released a broad range of functional metabolites from marine bio-resources over the last few years. With the growing interest of industrial applications and development of new extractions protocols, the exploration of new enzymes or enzyme sources have given a new era for the future biotechnology. In particular, a high specificity and a very high reactivity even at low concentrations have been facilitated in different enzymes to use in multiple purposes (Gudmundsdottir and Bjarnason, 2008). In this regard, marine organisms have targeted to isolate stable novel enzymes at hyperthermal and extremely acidic conditions even from the coldest habitats of the marine organisms which are being extensively studied (Debashish et al., 2005). Especially enzymatic applications in food processing, diagnostics, molecular biology research, pharmacological and health care as well as environment monitoring applications have been developed (Shahidi and JanakKamil, 2001). Some of the isolated and purified marine enzymes which were biochemically characterized as for future applications were summarized in Table 1.

    [Table 1.] Isolated enzymes and their functional potentials for future food and medicinal applications


    Isolated enzymes and their functional potentials for future food and medicinal applications

    Marine Lipids

    Marine bio-resources are characteristically comprised of a significant lipid composition which takes a greater attraction for many lipids, including monogalactosyl diacylglycerols (MGDG), digalactosyl diacylglycerols (DGDG), and phosphatidylglycerols (PG). In addition, Bruno et al. (Bruno et al., 2005) have shown that these bio-molecules are attributed with health promotion effects. Over the many years, the extensive studies have documented that the lipid fractions of marine food sources are primarily consisted of poly unsaturated fatty acids (PUFA). This represents omega-3 and omega-6 fatty acids, including eicosapentaenoic (EPA) or docosahexaenoic acids (DHA).

    Consumption of seafood is proven to be preventing the life style diseases and giving a long term health claims. It has been noticed and widely accepted that the long chain omega-3 fatty acid molecules help to prevent cardiovascular diseases (Ward and Singh, 2005; Calzolari et al., 2009; Zuliani et al., 2009; Schuchardt et al., 2010; Stengel et al., 2011). In addition, abundant evidences have shown that fish oil, shellfish and seaweed PUFA can reduce the risk of certain cardiovascular diseases (Saremi and Arora, 2009; Marik and Varon, 2009). Furthermore, consumption of fish for one or two times per week may enhance the protective effect against coronary heart diseases; especially reducing the death risk by 36% and 17% from total mortality due to high content of DHA and EPA in the diet (Mozaffarian and Rimm, 2006). A noteworthy finding is that intake of EPA and DHA at 250 mg or range from 850 ~ 4000 mg per day can expected to provide promising health protective effects by primary and secondary prevention levels (Jacobson, 2006). In addition, the intake of a sufficient amount of these functional ingredients also has been associated to relieving effects of some symptoms or medical conditions such as inflammatory diseases (Rosell et al., 2009), physiological conditions (Appleton et al., 2010), diabetes (Patel et al., 2007) and cancers (Szymanski et al., 2010). Basically, Riediger et al. (Riediger et al., 2009) have reported that the development of protective effect was mechanistically being proven by epidemiological studies due to pleiotropic effects including inflammation, platelet aggregation, hypertension and hyperlipidemia.

    Very recently marine algae have been demanded as materials for production of oil due to the content of lipids for the potential of biodiesel production (Williams and Laurens, 2010). As reported, the content of lipids exists within the range of (1-5%) and (15-50%) in the dry weight of seaweed and microalgae, respectively (Burtin, 2003; Williams and Laurens, 2010). For example, a marine diatom, Phaeodactylum tricornutum showed 30-45% of PUFA, accounted for EPA up to 20- 40% of the total fatty acids (Plaza et al., 2009). However, the same significant value has been taken on the fish waste and processing by-products with the prolific lipid sources (Ferraro et al., 2010). For example, fish by-product commodities such as sardine, mackerel, shark, and cod contain more than 30% of PUFA including essential omega-3 and 6 lipids for commercialization (Chakraborty and Raj, 2007). In particular, salmon head consider as a good source of PUFA as major part of the by-products. However, most of these by-products have marketed by recovering their essential lipids as nutraceutical or food supplements recently (Mondello et al., 2006) (Table 2). These evidences suggest that the future biotechnology on functional foods and health products may directly depend upon the marine waste and processing by-products. Thus the understanding of the sustainability of the marine bio-resources might be performed much significant role in future (Bimbo, 2007).

    [Table 2.] Isolated some of functional ingredients from marine bio-resources and possible health effect for future applications


    Isolated some of functional ingredients from marine bio-resources and possible health effect for future applications

    Impact of biotechnological advances on marine bio-resources

    The idea of an implementation of the green chemistry and biotechnology for the isolation of marine bioactive components is to sustain, design and develop in environmental friendly way with focusing on new protocols, methods, procedures and systems. The above mentioned technologies have come up with new trends in the future biotechnology and pharmacology applications, in order to improve health benefits without damage to the bio-resources and marine environment as well. Progress of the biotechnology is currently being served for the exploration of new functional materials from marine life. Thus, this can cure health disorders and consider as a challenge to the upcoming diseases as well. However, recent biotechnological aspects are expected to hold the promising effects against the numerous disciplines, where it can be approached to focus on research tools and strategic importance, such as algae biomass culturing, aquaculture, harnessing biomaterials, bioremediation, bioinformatics, marine genomics, genetic engineering and research infrastructures. These evidences suggest that the importance of the utilization of sustainability of marine bio-resources and protection of marine environment along with its biodiversity for the future benefits of mankind (Baerga-Ortiz, 2009).

    Molecular Biological approaches on investigation and development of marine bio-resources

    Molecular biology is a remarkable field of biology, which is basically dedicated to study on structures and functions of macro molecules like nucleic acids and proteins, with respect to their roles in life processes. However, applications of this promising discipline on marine bio-resources such as microorganisms, algae, invertebrates, vertebrates including economically important fish species have become precious recently. In fact, tremendous collaboration with other related disciplines including marine biology, chemistry and microbiology lead to the sustainable exploration of marine life, mainly for human health and welfare. As described in previous sections, marine eco-system consisted of a huge diversity of organisms and that is a prominent source of wide array of therapeutic agents which can be developed as pharmaceuticals. Novel propagations of molecular biology, including genomics, metagenomics, transcriptomics, proteomics and bioinformatics, along with development of its technologies, such as genetic engineering and bio-activity screening offers a unique opportunity to establish marine natural products as interesting drug candidates (Fig. 2).

    Most of the microorganisms present in the marine environments are not readily cultivable (Streit and Schmitz, 2004). Therefore culture independent technique is needed for the yielding of natural products from those organisms. This bottleneck can be overcome by metagenomic approaches, which can further maximize the diversity of libraries of marine natural products, through direct accessibility of DNA from marine organisms (Martinez et al., 2005; Zengler et al., 2005). Basically in these genetic strategies, genomic DNA from the interested microorganisms is isolated and digested into large fragments using restriction enzymes. Subsequently, the fragments are cloned into artificial vector systems and sequenced through high throughput sequencing techniques to screen the putative clones for the potent genes or gene clusters encoding the protein components involved in biosynthetic pathways of the corresponding natural products. After detecting particular genes or gene clusters, gene sequence can be analyzed using bioinformatics tools to reveal chemical structure of the desired genes (Zazopoulos et al., 2003; Farnet and Zazopoulos, 2005). This approach may in turn leads to investigate the regulatory mechanisms of the gene expression with respect to the existing biosynthetic pathways of natural products or to combine them with genes in other pathways, to synthesize novel compounds (Gust, 2009).

    Single cell genomics is an another extension of molecular biology, which can be used as an promising tool to study the entire biochemical potential of single uncultured microbes from complex microbial communities, using a strategy known as multiple displacement amplification (Woyke et al., 2009). Several explorations have been made based on the genomic and metagenomic approaches, including the identification of putative bryostatin polyketide synthase gene cluster from the marine bacterium Candidatus Endobugulase ertula, which encodes crucial constituents in biosynthesis of pharmaceutically potent bioactive compounds, known as bryostatins (Sudek et al., 2007) and characterization of polyketide biosynthesis with respect to the corresponding genes, such as polyketide synthase (PKs) and non-ribosomal peptide synthetase (NRPS), which is responsible for the production of antitumor molecules, from an uncultivated bacterial symbiont of the marine sponge, Theonellaswinhoe (Li and Piel, 2002; Zengler et al., 2005;Teta et al., 2010). In addition, polyketides coding genes were identified in Streptomyces species, convincing the antitumor and antibiotic secretary possibility of marine bacteria as their secondary metabolites (Streit and Schmitz, 2004). Particularly, PKs and NRPS can be used in screening approaches to pre-select new isolates with promising bioactivities for natural product analysis.

    Genome sequence tags (GST) are identified genes, involved in natural product biosynthesis, which can be employed as probes to screen clonal libraries, in order to select putative clones for further screening for novel natural product gene clusters in marine organisms. Restriction fragment length polymorphism (RFLP) is a basic molecular biological technique, which is now applied in screening of marine microbial genomic libraries and especially in identification of microbes exhibiting bio-active potential, using PCR amplified fragments of 16S and 18S rRNA coding genes in marine microbial drug discovery programs (Thakur et al., 2008). Nevertheless, more efforts are in progress to identify and analyze a set of genes present in the genome of marine organisms that encodes a chain of enzymes, further synthesizing bioactive compounds to disclose the hidden potential biosynthetic pathways of marine organisms.

    Discovering novel anti-microbial peptides (AMP) can be originated from marine invertebrates; For instance penaedin, crustin and defensing etc, have been facilitated by molecular iological approaches, especially through isolation of cDNA transcripts or express sequence tag (EST) clones which show homology with already characterized AMP sequences, furnishing ease and successful investigations as desirable features (Patrzykat and Douglas, 2003). For an example, Ls-stylclin was able to be identified in shrimp Litopenaeus stylirostris using sequence information of its transcripts (Rolland et al., 2010). Using this strategy, around 20 peptide sequences were found to be potentially antimicrobial peptides, including iPAP-A and ci-MAM-A which exhibit broad spectrum of antimicrobial activity (Fedders et al., 2010).

    Large scale extractions and supply of the complex natural chemicals from marine bio-resources are environmentally unsound and economically unviable. In this regard, genetic engineering provides a better solution through production of recombinant purified compounds. Purity, safety and effective positive impact on human health care are some of the prevailing advantages of recombinant products against natural extracts, with respect to the pharmaceutical compounds obtained from marine biomasses. Intriguingly, a successful attempt was made by researchers from Australian Institute of Marine Science and London School of Pharmacy, on shotgun cloning and heterologous expression of the patellamide gene cluster, to produce antineoplastic metabolites, patellamides (Long et al., 2005).

    Metabolic engineering is a remarkable extension of genetic engineering, which is commonly experienced in terrestrial plants and microorganisms which stands for modification of cellular metabolic pathways to enhance the metabolic composition. Complying with the basic objective, improvement of the metabolic composition can be accomplished through producing new compounds, enhancing the production of existing compounds and eliminating undesirable products of the biosynthetic pathways through introducing novel genes or total pathway and over expression of endogenous pathways. These modifications can be achieved by several possible genetic manipulations, such as up-regulation of transcriptional factors, which in turn enhance the transcription of genes involve in biosynthetic pathway, down regulation of endogenous genes, using anti-sense RNA technology or RNA interference (RNAi) technique to eliminate the obstructive regulation of the synthesis of desired product and increasing the copy number of the gene or genes cluster of interest or driving the expression of the desired genes under strong promoters to over express the genes. In most of the above approaches, transgenic technology is commonly used to introduce the exogenous gene into the desired organism (Tuteja et al., 2012). Among the marine organisms, especially marine microorganisms, algae and sponge like invertebrates can also be considered as prospective candidates to be subjected to the genetic improvements, as described above, to improve them as sustainable resources of bioactive compounds. Eventually, the overall insights into the impact of molecular biology on the field of investigation and development of marine bio-resources convince us a flourishing future, especially with respect to the drug discovery programs.

    Future challenges and prospective marine biotechnology

    Marine organism cultivation has been practiced long time ago; however, marine micro and macro algae (seaweeds) are much significant and mainly cultivated by two systems such as open culture and closed (photobioreactors) or artificial culture (Fernandez et al., 2013). Particularly, each one of the culturing systems has either desirable or undesirable, since the photosynthetic organisms and their mass production may directly correlate with the source of energy. Open culture systems can be established for seaweed or some of the microalgae farming. and can be achieved by low cost, high capacity and free access solar energy for high photosynthetic efficiencies with long term durability (Robertsonet et al., 2008; Chen et al., 2011). However, impossibility to control temperature, invasion of parasitic algae or other algae strains may result in negative drawbacks. Despite these situations, only selected few microalgae strains can be used in controlled conditions for the cultivation in particular environments like, high alkaline environment for Spirulina splatensis and high salinity condition for Dunaliella salina (Garcia et al., 2003; Harun et al., 2010). However, the production of β-carotene from D. salina is interested in closed culturing system over the open system (Heakal et al., 2010; Prieto et al., 2011). Therefore the closed culture system is preferable for culturing particular microalgae (Sánchez et al., 2008). The controlled optimum condition with the operational inputs such as salt, dissolved CO2, water, nutrients, pH and O2 provide a great opportunity for the steady environment without being contaminated in the closed cultures. However, a certain type of conditions may lead to the high cost of the closed system than the open system. In fact, these cell factories have gained many opportunistic advantages and still remain a competitive cultivation options for the production of marine algae. In addition, production of marine functional ingredients from marine algae sources is one of the leading industries that correlate with mass culture techniques and uses for the applications in food, pharmaceuticals and cosmetics (Dufosse et al., 2005). For an example, marine pigments, mainly carotenoids including β-carotene, astaxanthine, lutein, zeaxanthin as well as phycocyanin and chlorophyll have been documented along the production and extraction parameters recently (Gonzalez et al., 2005; Sánchez et al., 2008). In addition, there is a growing awareness on the single cell oils (SCO) due to the richness of PUFA in marine microalgae (Ward and Singh, 2005). Therefore, optimizing photobioreactors for cultures and scaling up approaches have been shown a great deal against different microalgae while opening up a wide market place for them.

    Over the many years, there is a new trend behind the cultivation of microorganisms or microorganism associated to invertebrate symbionts by marine scientists. Besides the knowledge of the both open sea-based aquaculture and alternative growing methods are likely to be an important with requiring the detailed information about the biology and life cycle of the culturing organisms and the different symbiotic associations. It is not a surprised fact that the marine organisms and symbiotic associations are important for new functional materials. In fact, the way of applying biotechnology upon the marine eukaryotes and prokaryotes, along the cultivation is believed as a new research for feeding sources on desired organism and improving the growth rate as well as disease prevention. On the other hand, bioremediation is also an important discipline associated with the marine microorganisms. It is basically degradation of toxic pollutants into non-toxic products through marine microbial community. Marine pollutants including, heavy metals, oil spills, industrial wastes and other nuclear contaminants have become more problematic issues and exerts the bad effects always on marine enviornments. However, marine biotechnology and marine bio-resources can be provided sustainable solutions along the bioremediation (Deng and Wang, 2012). This is an effective and efficient treatment for cleaning up hazardous materials than the conventional methods. Microbial communities and biological remediation will be not damage to the fragile marine ecosystems and described as natural phenomenal approaches. Hence, identification and isolation of specific marine microbes which could accumulate toxic contaminants for bioremediation would be the key successor. In fact, characterizing the culture conditions for surviving in affected areas and for the habitat protection would be expected.

    Despite the fact, the aquaculture industry has been developed fast enough to produce more than 16 million tons of fish and shellfish annually for the world food market. FAO (F.A.O., 2010) has noted that the total aquacultural fish production was reported to be increased the range from 15.3 to 21 million tons during the year 2004 to 2009. Moreover, in terms of the utilization for human consumption, nearly 15.7% of world population accounted for fish proteins and fish production has been exponentially increased in recent past years. On the other hand, the total marine functional ingredients have been grown faster than the other food ingredients by 8-12% since 2005. Importantly, marine functional ingredients have attributed in the utilization at pharmaceutical, nutraceutical, health care, food and feed markets. In fact, this market value was reached to approximately 43.5 billion USD in 2010 and showed a 7.3 billion USD growth rate after year 2005 (Elvevoll et al., 2006; Sharma, 2009). Therefore, a wide range of social, economical, institutional and biotechnological considerations are implemented for the development of fish, shellfish and marine microbes cultures. This has been further flourished due to the new vaccine therapies, hormone therapies for gaining resistance and transgenic techniques in advancing on the establishment of aquaculture. However, this would spread more by introducing new species in extensive cultivation, raising the diversity of marine foods or biomedical products and also developing the sustainable practices through the physiological health benefits (Slocombe et al., 2013).

    As a consequence, the rapid growth of marine bio-resources and a significant expansion of marine biotechnological aspects are expected within the next few decades, In fact, marine genomics research may involve generating new tools, functional molecular markers, bioinformatics, and new knowledge about statistics as well as inheritance phenomena that could increase the efficiency and precision of marine biotechnological applications. In addition, in order to meet the requirements of better understanding with the infrastructures of scientific communities, integrations are needed to fulfill through the collaborative researches. Collectively, capitalizing the knowledge and experience of the marine biotechnologists and strengthening the awareness of interdisciplinary expertise can secure the sustainability of marine bio-resources.

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이미지 / 테이블
  • [ Fig. 1. ]  Flow chart of the possible exploration and development of the functional ingredients from marine bio-resources through the conventional and green extraction technologies for future pharma-nutra applications.
    Flow chart of the possible exploration and development of the functional ingredients from marine bio-resources through the conventional and green extraction technologies for future pharma-nutra applications.
  • [ Table 1. ]  Isolated enzymes and their functional potentials for future food and medicinal applications
    Isolated enzymes and their functional potentials for future food and medicinal applications
  • [ Table 2. ]  Isolated some of functional ingredients from marine bio-resources and possible health effect for future applications
    Isolated some of functional ingredients from marine bio-resources and possible health effect for future applications
  • [ Fig. 2. ]  Flow chart of the investigation and development of functional ingredients via Molecular Biology studies for future biotechnology.
    Flow chart of the investigation and development of functional ingredients via Molecular Biology studies for future biotechnology.
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