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【答案】应助回帖
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sltmac(金币+1): 感谢应助~~ 2011-05-21 12:48:02
asd123xukun(金币+100, 翻译EPI+1): 2011-05-23 19:23:33
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Biological molecules oxidation is a radical mediated process, it will cause many adverse effects on food and biological systems.In human organs,the free radical produces inevitably in the process of oxygen metabolism , and it causes atherosclerosis ,cancer and other diseases.In food, the oxidation of food nutrients can produces peroxide , it not only affects the food nutrition value, causes food quality drop, seriously even causes intake person the body disease.Therefore, looking for safe antioxidants to suppress peroxide has been hotspot of biochemical nutrition research.Because of BHTand TBHQ chemical synthesis have better effect and cheaper price than natural antioxidants, so they has been widely used in food industry.However, at present, studies have found that synthetic antioxidants affects cancer accumulately on human liver, lienal and lung, which caused people to concern its security, and gradually began to limit the use in ifood.So people turned to natural antioxidants,α-tocopherol is used as a kind of natural antioxidant widely , it can effectively maintain the stability of food in oil, but against food preservation.Therefore, it is necessary for us to find a kind of safe natural antioxidants of other sources.Research found that hydrolysate protein of many different sources have certain antioxidant capacity,such as casein, soy protein, bovine serum albumin, LuanBai protein, oil seeds protein, wheat gliadin and corn protein, etc.Although we are not clear about polypeptide plays antioxidant activity mechanism , there are reports that some aromatic amino acids and l-histidine played an important role.Gelatin contains hydrophobic aminoacids,and can form a stable emulsion system of amino acids high affinity with other lipid. Therefore, gelatin peptide is considered more strong antioxidant activity than other polypeptide.This paper aims to separate and purificatie a new type of antioxidant peptide from sharkskin gelatin and to study its biological activities . |
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