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Food proteins and bioactive peptides play a vital role in the growth and development of the body’s structural integrity and regulation, as well as having a variety of other functional properties. Land animal-derived food proteins such as collagen and gelatine carry risks of contamination (such as BSE). Marine-derived proteins, which can provide equivalents to collagen and gelatin without the associated risks, are becoming more popular among consumers because of their numerous health beneficial effects. Most marine-derived bioactive peptides are currently underutilized. While fish and shellfish are perhaps the most obvious sources of such proteins and peptides, there is also the potential for further development of proteins and peptides from sources like algae, sea cucumber and molluscs. Marine-derived proteins and peptides also have potential uses in novel products, with the possibility of wide commercialization in the food, beverage, pharmaceutical and cosmetic industries, as well as in other fields such as photography, textiles, leather, electronics, medicine and biotechnology.
Marine Proteins and Peptides: Biological Activities and Applications presents an overview of the current status, future industrial perspectives and commercial trends of bioactive marine-derived proteins and peptides. Many of the industrial perspectives are drawn from the food industry, but the book also refers to the pharmaceutical and cosmetics industries. There have recently been significant advances in isolating functional ingredients from marine bio-resources and seafood by-products for use in these industries, but little has been published, creating a knowledge gap, particularly with regard to the isolation and purification processes. This book is the first to fill that gap.
Marine Proteins and Peptides: Biological Activities and Applications is a valuable resource for researchers in marine biochemistry field as well as food industry managers interested in exploring novel techniques and knowledge on alternative food protein sources. It will become a standard reference book for researchers involved in developing marine bio-resources and seafood by-products for novel nutraceutical, cosmetics, and pharmaceutical applications. It will also appeal to managers and product developers in the food, pharmaceutical and cosmetics industries, particularly those looking to use marine-derived proteins and peptides as substitutes or replacements for unfashionable or outdated food components.
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Table of Contents
Title Page
Copyright
List of Contributors
Chapter 1: Marine-derived Peptides: Development and Health Prospects
1.1 Introduction
1.2 Development of Marine Peptides
1.3 Health Benefits of Marine Peptides
1.4 Conclusion
References
Chapter 2: Bioactive Proteins and Peptides from Macroalgae, Fish, Shellfish and Marine Processing Waste
2.1 Introduction
2.2 Macroalgal, Fish and Shellfish Proteins: Potential Sources of Bioactive Hydrolysates and Peptides
2.3 Enzymatic Hydrolysis of Macroalgal, Fish and Shellfish Processing Waste Proteins: Bioactive Protein Hydrolysates and Peptides
2.4 Endogenous Bioactive Peptides from Macroalgae, Fish and Shellfish
2.5 Bioactive Proteins from Macroalgae, Fish and Shellfish
2.6 Commercial Products Containing Marine-Derived Bioactive Protein Hydrolysates and Peptides
2.7 Conclusion
Acknowledgement
References
Chapter 3: Lectins with Varying Specificity and Biological Activity from Marine Bivalves
3.1 Introduction
3.2 Lectins
3.3 Isolation, Molecular Characterization and Carbohydrate Specificity of Bivalve Lectins
3.4 Biological Functions of Bivalve Lectins
Acknowledgements
References
Chapter 4: Digestive Enzymes from Marine Sources
4.1 Introduction
4.2 Biodiversity and Availability
4.3 Marine Biocatalysts
4.4 Digestive Enzymes
4.5 Lipases
4.6 Industrial Applications
References
Chapter 5: Kamaboko Proteins as a Potential Source of Bioactive Substances
5.1 Introduction
5.2 Creation of Healthier and Safer Foods
5.3 Enzymatic Modification of Food Proteins
5.4 Kamaboko
5.5 Chemical Properties of Kamaboko
5.6 Expression of Health the Function of Kamaboko Proteins
5.7 Antioxidative Activities of Kamaboko Proteins
5.8 Angiotensin I-Converting Enzyme-Inhibitory Activities of Kamaboko Proteins
5.9 Conclusion
References
Chapter 6: Biological Activities of Fish-protein Hydrolysates
6.1 Introduction
6.2 Angiotensin I-Converting Enzyme Inhibitors
6.3 Antioxidative Properties
6.4 Anticancer Activity
6.5 Antimicrobial and Antiviral Activity
6.6 Calcium-Binding Peptides
6.7 Appetite Suppression
6.8 Anticoagulant Activity
6.9 Immunostimulant Activity
6.10 Hypocholesterolemic Activity
6.11 Hormone-Regulating Properties
6.12 Other Biological Activities
References
Chapter 7: Biological Activities of Proteins and Marine-derived Peptides from Byproducts and Seaweeds
7.1 Introduction
7.2 Bioactive Peptides
7.3 Marine-derived Bioactive Peptides
7.4 Isolation and Characterisation of Marine-derived Bioactive Peptides
7.5 Lectins
7.6 Phycobiliproteins
7.7 Other Amino Acids and Peptides Present in and Derived from Macroalgae
7.8 Membrane Processing
7.9 Bioactivities of Marine-derived Peptides—inhibiting Proteases for Health
7.10 Heart-health Bioactive Peptides
7.11 Commercially Available Bioactive Peptides
7.12 Conclusion
References
Chapter 8: Ability of Diverse Marine Invertebrate Lectins to Regulate Cell Functions
8.1 Introduction
8.2 Does a Feather Star Lectin have a Role in Regenerative Biology?
8.3 A Novel Lectin from the Mediterranean Mussel Induces Apoptosis and Glycosphingolipid Interaction
8.4 Downregulation of the Gene Expression of an ABC Transporter by a Novel Lectin-glycosphingolipid Pathway Involving a Suel-type Lectin Domain
8.5 Perspectives on Studies of Invertebrate Lectins and Their Diverse Properties
References
Chapter 9: Routes in Innate Immunity Evolution: Galectins and Rhamnose-binding Lectins in Ascidians
9.1 Animal Lectins
9.2 Ascidians
9.3 Galectins
9.4 Rhamnose-binding Lectins
9.5 Conclusion
Acknowledgements
References
Chapter 10: Production of Lactobacilli Proteinases for the Manufacture of Bioactive Peptides: Part I—Upstream Processes
10.1 Introduction: Bioactive Peptides—Production And Functionalities
10.2 Lactobacilli Metabolism
10.3 The Proteolytic System of The Lactobacilli
10.4 Sources of Proteases and Advantages of Microbial Proteases
10.5 Marine Lactobacilli
10.6 Proteinase Production Requirements
10.7 Effect of Fermentation Modes on Cell Growth and Proteinase Production
10.8 Cell Systems for Proteinase Production
10.9 Statistical Methods and Mathematical Models
10.10 Conclusion
Acknowledgements
References
Chapter 11: Production of Lactobacilli Proteinases for the Manufacture of Bioactive Peptides: Part II—Downstream Processes
11.1 Introduction: Cell Recovery
11.2 Isolation: Proteinase-extraction Methodologies
11.3 Purification of Enzymes
11.4 Enzyme Concentration and Storage
11.5 Characterisation of Proteinase
11.6 Solvent and Enzyme Engineering for Enhanced Stability and Specificity
11.7 Conclusion
References
Chapter 12: Recovery of Proteins and their Biofunctionalities from Marine Algae
12.1 Introduction
12.2 Importance of Proteolytic Enzyme-assisted Extractions
12.3 Marine-algal Functional Proteins and Peptides with Bioactivity
12.4 Marine-algal Proteins: Potential Sources for Future Applications
12.5 Conclusion
References
Chapter 13: Fish Gelatin: A Versatile Ingredient for the Food and Pharmaceutical Industries
13.1 Introduction
13.2 Structural Features of Fish Gelatin
13.3 Improvement of Functional Properties
13.4 Applications in the Food Industry
13.5 Applications in the Pharmaceutical Industry
13.6 Conclusion
References
Chapter 14: Health Effects of Antioxidative and Antihypertensive Peptides from Marine Resources
14.1 Introduction
14.2 Antioxidative Peptides
14.3 Antihypertensive Peptides
14.4 Conclusion
References
Chapter 15: Potential Novel Therapeutics: Some Biological Aspects of Marine-derived Bioactive Peptides
15.1 Introduction
15.2 Marine-derived Proteins and Biopeptides with Antihypertensive Activity
15.3 Anticancer Effects of Marine-derived Bioactive Peptides
15.4 Antiviral Bioactivities of Marine-derived Bioactive Peptides
15.5 The Future of Marine Peptides as Therapeutics
References
Chapter 16: Hormone-like Peptides Obtained by Marine-protein Hydrolysis and Their Bioactivities
16.1 Introduction
16.2 Growth Hormone-Release Peptides
16.3 Opioid-Like Peptides
16.4 Immunomodulating Peptides
16.5 Glucose Uptake-Stimulating Peptides
16.6 Secretagogue and Calciotropic Activities
16.7 Limitations on the use of Hormone-like Peptides as Nutraceuticals
16.8 Further Development and Research Needs
References
Chapter 17: Antimicrobial Activities of Marine Protein and Peptides
17.1 Introduction
17.2 Preparation, Purification and Characterization
17.3 In Vitro Antimicrobial Studies
17.4 Antimicrobial Mechanisms
17.5 Applications and Prospects in Food Preservation
17.6 Conclusion
References
Chapter 18: Production and Antioxidant Properties of Marine-derived Bioactive Peptides
18.1 Introduction
18.2 Production of Antioxidant Peptides
18.3 Antioxidant Mechanism and Structure–activity Relationship
18.4 Industrial Applications and Perspectives
References
Chapter 19: Marine Peptides and Proteins with Cytotoxic and Antitumoral Properties
19.1 Introduction
19.2 Current Pipeline of Oncological Drugs Based on Natural Products
19.3 Current Pipeline of Marine Peptides with Antitumoral Activity
19.4 Major Biological Sources of Marine Cytotoxic Peptides and Proteins
19.5 Structural Motifs in Cytotoxic Peptides
19.6 Cytotoxic Acyclic Peptides
19.7 Cytotoxic Cyclic Peptides
19.8 Cytotoxic (Poly)Peptides Obtained by Enzymatic Hydrolysis of Seafood
19.9 Cytotoxic Polypeptides
19.10 Conclusion
19.11 Acknowledgments
References
Chapter 20: ACE-inhibitory Activities of Marine Proteins and Peptides
20.1 Introduction
20.2 Determination of ACE-inhibitory Peptide Activity
20.3 ACE-inhibitory Peptides from Marine Sources
20.4 Types of ACE-Inhibitor Peptide
20.5 Structure–Activity Relationships of ACE-Inhibitory Peptides
20.6 Conclusion
References
Chapter 21: Isolation and Biological Activities of Peptides from Marine Microalgae by Fermentation
21.1 Introduction
21.2 Utilization of Fermentation to Hydrolyze Protein
21.3 Microalgae As a Source of Protein
21.4 Metabolites of Proteolytic Hydrolysis by Fermentation
21.5 Hydrolyzed Microalgal Peptide Application
21.6 Conclusion
References
Chapter 22: Antioxidant Activities of Marine Peptides from Fish and Shrimp
22.1 Introduction
22.2 Production, Isolation, and Purification of Antioxidant Peptides
22.3 Methods Used to Measure Antioxidant Activity
22.4 Antioxidant Activity of Peptides
22.5 Antioxidant Mechanisms of Peptides
22.6 Applications and Prospects
References
Chapter 23: Fish-elastin Hydrolysate: Development and Impact on the Skin and Blood Vessels
23.1 Introduction
23.2 Starter Materials for Fish-elastin Hydrolysate
23.3 Preparation of Skipjack-elastin Hydrolysate
23.4 Impact of Ingestion of Skipjack-elastin Hydrolysate on Skin Conditions
23.5 Impact of Skipjack-elastin Hydrolysate on Blood Vessels
23.6 Safety of Skipjack-elastin Hydrolysate
23.7 Identification of Food-derived Elastin Peptide in Human Blood
23.8 Effect of Food-derived Elastin-peptide Pro-gly on Cells
23.9 Conclusion
References
Chapter 24: Free Radical-scavenging Activity of Marine Proteins and Peptides
24.1 Introduction
24.2 Formation of Free Radicals and Methods of Assaying Antioxidant Activity
24.3 Free Radical-scavenging Activity of Marine Proteins and Peptides
24.4 Conclusion
References
Chapter 25: Marine-derived Bioactive Peptides: Their Cardioprotective Activities and Potential Applications
25.1 Introduction
25.2 Cardiovascular Diseases and Nutraceuticals
25.3 Sources of Marine Peptides
25.4 Development of Marine Bioactive Peptides
25.5 Oxidative Stress
25.6 Antihypertensive Activity
25.7 Anticoagulant Activity
25.8 Conclusion
References
Chapter 26: Biological Activities of Marine Bioactive Peptides
26.1 Introduction
26.2 Physiological Properties of Marine Bioactive Peptides
26.3 Conclusion
Acknowledgement
References
Chapter 27: Shark Fin Cartilage: Uses, Extraction and Composition Analysis
27.1 Introduction
27.2 History
27.3 Uses
27.4 Shark-fin Processing
27.5 Extraction of Elastoidin and Chondroitin Sulfate
27.6 Composition Analysis
References
Chapter 28: Marine Bioactive Peptide Sources: Critical Points and the Potential for New Therapeutics
28.1 Introduction
28.2 Marine Bioactive Peptide Sources
28.3 Critical Points and the Potential for New Therapeutics
28.4 Conclusion
References
Chapter 29: Applications of Marine-derived Peptides and Proteins in the Food Industry
29.1 Introduction
29.2 Marine-derived Proteins and Peptides Used in the Food Industry
29.3 Collagen and Gelatin
29.4 Extraction and Isolation of Marine-derived Proteins and Peptides
29.5 Food-related Applications of Marine-derived Proteins and Peptides
29.6 Conclusion
References
Chapter 30: Processing and Industrial Aspects of Fish-scale Collagen: A Biomaterials Perspective
30.1 Introduction
30.2 Structure and Composition of Collagen
30.3 Synthesis of Collagen
30.4 Type-i Collagen
30.5 Recombinant Collagen
30.6 Fish's Potential as an Alternative Source of Collagen
30.7 Emerging Applications of Type-I Collagen
30.8 Conclusion
Acknowledgement
References
Chapter 31: Properties, Biological Advantages and Industrial Significance of Marine Peptides
31.1 Introduction
31.2 Marine-peptide Properties
31.3 Industrial Development of Marine Bioactive Peptides
31.4 Biological Applications of Marine Peptides
31.5 Conclusion
References
Chapter 32: Muscle Proteins of Fish and Their Functions
32.1 Introduction
32.2 Fish Muscles
32.3 Myoglobin and Myofibrillar Proteins of Fish Muscle
32.4 Sarcoplasmic Protein
32.5 Antifreeze Proteins
References
Chapter 33: Marine-derived Collagen: Biological Activity and Application
33.1 Introduction
33.2 Sources of Marine Collagen
33.3 Applications of Marine Collagen
References
Chapter 34: Marine Antifreeze Proteins: Types, Functions and Applications
34.1 Introduction
34.2 Types of Marine AFP
34.3 Preparation of Fish AFPS
34.4 AFP Applications
34.5 Conclusion
References
Chapter 35: Antimicrobial Peptides in Marine Mollusks and their Potential Applications
35.1 Introduction
35.2 Characteristics of AMPS
35.3 Diversity Of Amps In Marine Mollusks
35.4 Applications of Mollusk-derived AMPS
References
Chapter 36: Protein Hydrolysates and Bioactive Peptides from Seafood and Crustacean Waste: Their Extraction, Bioactive Properties and Industrial Perspectives
36.1 Introduction
36.2 Overall Chemical Composition of Seafood and Crustaceans
36.3 Extraction of Protein Hydrolysates and Bioactive Peptides from Seafood and Crustacean Waste
36.4 Characterization of Fish-protein Hydrolysates and Bioactive Peptides
36.5 Functional and Bioactive Properties of Proteins and Peptides from Seafood and Crustacean Waste
36.6 Conclusion
References
Chapter 37: Production and Health Effects of Peptides from Fish Proteins
37.1 Introduction
37.2 Sources of Fish Peptides
37.3 Production of Fish Peptides
37.4 Health-promoting ability of fish peptides
37.5 Future Trends of Peptides from Fish Proteins
37.6 Conclusion
References
Index
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Library of Congress Cataloging-in-Publication Data
Kim, Se-Kwon, author.
Marine proteins and peptides : biological activities and applications / Se-Kwon Kim.
p. ; cm.
Includes bibliographical references and index.
Summary: ‘‘This book will provide cutting edge content on both the human health benefits of marine proteins and peptides, and their industrial applications’’ – Provided by publisher.
ISBN 978-1-118-37506-8 (cloth)
I. Title.
[DNLM: 1. Dietary Proteins– pharmacology. 2. Aquatic Organisms. 3. Drug Discovery. 4. Food Industry. 5. Peptide Hydrolases – pharmacology. 6. Seafood. QU 55.4]
615.1$′9–dc23
2012048619
A catalogue record for this book is available from the British Library.
Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books.
Cover image: iStock © Olga Khoroshunova
Cover design by Meaden Creative
List of Contributors
Se-Kwon Kim1,2 and Isuru Wijesekara2
1Marine Bioprocess Research Center, Department of Chemistry, Pukyong National University, Busan, Republic of Korea
2Department of Chemistry, Pukyoung National University, Nam-Gu, Busan, Republic of Korea
The role of protein in the human diet has been acknowledged recently worldwide. Dietary proteins have become a source of physiologically active components, which have a positive impact on the body's function after gastrointestinal digestion. Bioactive peptides may be produced by one of three methods: solvent extraction, enzymatic hydrolysis and microbial fermentation of food proteins. Marine-derived bioactive food proteins and biopeptides are often effective in promoting health and lead to a reduction in the risk of disease. Recently, much attention has been paid by consumers to natural bioactive compounds as functional ingredients. Hence, it can be suggested that marine-derived bioactive food proteins and biopeptides are alternative sources for synthetic ingredients that can contribute to consumers' well-being, as a part of functional foods, pharmaceuticals and/or cosmetics. Furthermore, they can be utilized in other industries such as medicine, animal feed, printing, textile and so on. This chapter presents an overview of the development, health effects, industrial perspectives and commercial trends of marine-derived bioactive food proteins and biopeptides used in the food, pharmaceutical and cosmetic industries.
Enzymatic hydrolysis of marine-derived proteins allows preparation of bioactive peptides, which can be obtained by in vitro hydrolysis of protein substrates using appropriate proteolytic enzymes. The physicochemical conditions of the reaction media, such as the temperature and pH of the protein solution, must then be adjusted in order to optimize the activity of the enzyme used. Proteolytic enzymes from microbes, plants and animals can be used for the hydrolysis process of marine proteins in order to develop bioactive peptides. Enzymatic hydrolysis is carried out under optimal conditions to obtain a maximum yield of peptides. For example, α-chymotrypsin, papain, Neutrase and trypsin have been applied to the hydrolysis of tuna dark muscle under optimal pH and temperature conditions for each by Qian et al. (2007).
One of the most important factors in producing bioactive peptides with desired functional properties for use as functional materials is their molecular weight (Deeslie & Cheryan, 1981). Therefore, for efficient recovery and in order to obtain bioactive peptides with a desired molecular size and functional property, an ultrafiltration membrane system can be used. This system's main advantage is that the molecular-weight distribution of the desired peptide can be controlled by adoption of an appropriate ultrafiltration membrane (Cheryan & Mehaia, 1990). In order to obtain functionally active peptides, it is normal to use three enzymes in order to allow sequential enzymatic digestion. Moreover, it is possible to obtain serial enzymatic digestions in a system using a multistep recycling membrane reactor combined with an ultrafiltration membrane system to separate marine-derived bioactive peptides (Jeon et al., 1999). This membrane bioreactor technology has recently emerged for the development of bioactive compounds and has potential for the utilization of marine proteins as value-added neutraceuticals with beneficial health effects.
Marine-derived antihypertensive peptides have shown potent antihypertensive effect with angiotensin-I-converting enzyme (ACE)-inhibition activity. The potency of these marine-derived peptides has been expressed as an IC50 value, which is the the ACE-inhibitor concentration that inhibits 50% of ACE activity. The inhibition modes of ACE-catalyzed hydrolysis of these antihypertensive peptides have been determined by Lineweaver–Burk plots. Competitive ACE-inhibitory peptides have been reported most frequently (Lee et al., 2010; Zhao et al., 2009). These inhibitors can bind to the active site in order to block it or to the inhibitor-binding site remote from the active site in order to alter the enzyme conformation such that the substrate no longer binds to the active site. In addition, a noncompetitive mechanism has been observed in some peptides (Qian et al., 2007; Suetsuna & Nakano, 2000). Numerous in vivo studies of marine-derived antihypertensive peptides in spontaneously hypertensive rats have shown potent ACE-inhibition activity (Fahmi et al., 2004; Zhao et al., 2009).
Recently, a number of studies have observed that peptides derived from different marine-protein hydrolysates act as potential antioxidants; these have been isolated from marine organisms such as jumbo squid, oyster, blue mussel, hoki, tuna, cod, Pacific hake, capelin, scad, mackerel, Alaska pollock, conger eel, yellow fin sole, yellow stripe trevally and microalgae (Kim & Wijesekara, 2010). The beneficial effects of antioxidant marine bioactive peptides in scavenging free radicals and reactive oxygen species (ROS) and in preventing oxidative damage by interrupting the radical chain reaction of lipid peroxidation are well known. The inhibition of lipid peroxidation by marine bioactive peptide, isolated from jumbo squid, has been determined by a linoleic acid model system; its activity was much higher than α-tocopherol and was close to the highly active synthetic antioxidant BHT (Mendis et al., 2005b).
Marine-derived antimicrobial peptides have described in the hemolymph of many marine invertebrates (Tincu & Taylor, 2004), including the spider crab (Stensvag et al., 2008), oyster (Liu et al., 2008), American lobster (Battison et al., 2008), shrimp (Bartlett et al., 2002) and green sea urchin (Li et al., 2008). Antibacterial activity has been reported in the hemolymph of the blue crab, Callinectus sapidus; it was highly inhibitory to Gram-negative bacteria (Edward et al., 1996). Although there are several reports of antibacterial activity in seminal plasma, few antibacterial peptides have been reported in the mud crab, Scylla serrata (Jayasankar & Subramonium, 1999).
The anticoagulant marine bioactive peptides have rarely been reported, but have been isolated from marine organisms such as marine echiuroid worm, starfish and blue mussel. Moreover, marine anticoagulant proteins have been purified from blood ark shell and yellow fin sole. The anticoagulant activity of these peptides has been determined by prolongation of activated partial thromboplastin time (APTT), prothrombin time (PT) and thrombin time (TP) assays and compared with heparin, the commercial anticoagulant.
Biologically active marine peptides are food-derived peptides that exert a physiological, hormone-like effect beyond their nutritional value, and have a possible role in reducing the risk of cardiovascular diseases by lowering plasma cholesterol level and show anticancer activity through a reduction in cell proliferation on human breast-cancer cell lines. Moreover, calcium-binding bioactive peptides derived from pepsin hydrolysates of the marine fish species Alaska pollock (Theragra chalcogramma) and hoki frame (Johnius belengerii) can be introduced to Asians with lactose indigestion and intolerance as an alternative to dairy products (Kim & Wijesekara, 2010).
Marine-derived proteins and bioactive peptides have potential for use as functional ingredients in neutraceuticals and pharmaceuticals due to their effectiveness in both prevention and treatment of diseases. Moreover, cost-effective and safe drugs can be produced from marine bioactive proteins and peptides. Further studies and clinical trials are needed for these bioactive proteins and peptides.
Cheryan, M., Mehaia, M. A. (1990). Membrane bioreactors: enzyme process. In: Schwartzberg, H., Rao, M. A. eds. Biotechnology and Food Process Engineering. Marcel Dekker: New York.
Deeslie, W. D., Cheryan, M. (1981). Continuous enzymatic modification of proteins in an ultrafiltration reactor. Journal of Food Science, 46, 1035–1042.
Jeon, Y. J., Byun, H. G., Kim, S. K. (1999). Improvement of functional properties of cod frame protein hydrolysates using ultrafiltration membranes. Process Biochemistry, 35, 471–478.
Lee, S. H., Qian, Z. J., Kim, S. K. (2010). A novel angiotensin I converting enzyme inhibitory peptide from tuna frame protein hydrolysate and its antihypertensive effect in spontaneously hypertensive rats. Food Chemistry, 118, 96–102.
Qian, Z. J., Je, J. Y., Kim, S. K. (2007). Antihypertensive effect of angiotensin I converting enzyme-inhibitory peptide from hydrolysates of bigeye tuna dark muscle, Thunnus obesus. Journal of Agricultural and Food Chemistry, 55, 8398–8403.
Pádraigín A. Harnedy and Richard J. FitzGerald
Department of Life Sciences, University of Limerick, Limerick, Ireland
The marine environment, which makes up more than 70% of the earth's surface, represents a vast, relatively untapped resource for biofunctional compound mining. To date, numerous nitrogenous components (protein, peptides and amino acids) with diverse biological activities have been identified in macroalgae, fish and shellfish. Furthermore, macroalgae, fish, shellfish and marine processing waste contain significant quantities of high-quality protein (10–47% (w/w)), which represents a good candidate raw material for further biofunctional peptide mining.
Significant quantities of waste are generated annually from onshore processing of fish and shellfish and during the processing of aquacultured fish and shellfish. For example, in Norway 800 000 metric tonnes of byproducts were generated by fish processing industries in 2009 (Rustad et al., 2011). It has been estimated that up to 25% of fish and shellfish can end up as waste. In general, this waste material consists of trimmings, viscera, fins, bones, head, skin, undersized fish and shellfish, damaged shellfish and shells. These waste components contain significant levels of protein with potential biofunctional and technofunctional properties. The mining and subsequent exploitation of marine byproducts/waste streams for components with bioactive properties represents a specific strategy for added-value generation. Furthermore, it provides a solution to the legal restrictions, high costs and environmental problems associated with disposal of such waste material. However, regulations concerning the treatment, storage and transport of fish and shellfish byproducts must be carefully adhered to if these raw materials are to be used as sources of functional food ingredients.
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