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[求助]
重金求高手帮忙翻译两段话，食品生物技术方面的，谢谢！
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生物分子的氧化是一个自由基介导的过程，它会对食品和生物系统造成许多不利的影响。在人体器官内，游离自由基会随着氧代谢的过程而不可避免地产生，并且它会引起动脉硬化和癌症等多种疾病。在食品中，食品营养成分的氧化会产生过氧化物，其不仅会影响食品的营养价值，引起食品品质下降，严重的甚至还会导致摄入者的身体发生疾病。因此，寻找安全的抗氧化剂以抑制过氧化物产生一直是生化营养学的研究热点。由于BHT、TBHQ等化学合成抗氧化剂比天然抗氧化剂具有更好的效果和更便宜的价格，因此其已经被广泛应用于食品行业中。但是，目前有研究发现合成抗氧化剂对人体肝、脾、肺等器官具有蓄积性致癌作用，从而引起了人们对其安全性的担忧，并且开始逐渐限制其在食品中的使用。于是人们把目光转向天然抗氧化剂。α-生育酚是一种被最普遍使用的天然抗氧化剂，它能有效保持食品中油脂的稳定性，但是却不利于食品保存。因此，我们有必要寻找一种其它来源的安全的天然抗氧化剂。 现有的研究发现，很多不同来源的水解蛋白都具有一定的抗氧化能力，如酪蛋白、大豆蛋白、牛血清白蛋白、卵白蛋白、油料种子蛋白、小麦醇溶蛋白和玉米蛋白等的水解物都具有一定的抗氧化性。虽然多肽发挥抗氧化活性的机理还不是特别清楚，但是有报道称某些芳香族氨基酸和组氨酸起到了重要作用。明胶中富含疏水性氨基酸以及其它与脂类具有较高亲和性并且可以形成稳定乳化体系的氨基酸，因此，明胶多肽被认为比其它多肽具有更强的抗氧化活性。本文旨在从鲨鱼皮明胶中分离纯化一种新型的抗氧化肽并对其生物活性进行研究。 [ Last edited by asd123xukun on 2011-5-18 at 18:25 ] |
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liqi9673
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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
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
| 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 . |
2楼2011-05-20 09:46:04
zuodg
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asd123xukun(金币+100): 2011-05-23 19:23:37
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Oxidation of biological molecules is a radicals-mediated process, which has many bad influences on food and biological system. In human organ, free radicals, which are inevitably produced through oxidative metabolism, induce several diseases like arteriosclerosis and cancer. In food, oxidation of food components produces peroxide, which affects not only nutritious value of food, but also quality of food, in some cases, intake of which results in diseases. Thus it has been a hot topic to search safe antioxidant in the field of biochemical nutrition. Because of better effect and cheaper prices, chemically synthesized antioxidant such as BHT and TBHQ are widely used in food industry. However, current research shows that synthesized antioxidant induce accumulative carcinogenesis of liver, spleen and lung, thus arousing people’s deep concern. People begin to limit application of synthesized antioxidant. Meanwhile, people pay attention to natural antioxidant. α-Tocopherol, a widely used natural antioxidant, sustains stability of lipid in food but does no good to storage of food. Therefore, it is necessary to search a different safe natural antioxidant from other resources. Available research indicates, hydrolyzed proteins from different resources, such as casein, soy protein, bovine serum albumin, egg protein, oilseeds protein, gliadin and corn protein have some antioxidative capability. Although antioxidative mechanism of polypeptides is not clear, still literature reports some aromatic amino acids and histidine play a major role. Gelatin, which contains rich hydrophilic amino acids and has good affinity with lipid to form stable emulsions, is considered to be better than other polypeptides with regard to antioxidative captivity. This article aims to isolate a new type of antioxidative peptide from skin gelatin of shark and investigate its biological activities. |
3楼2011-05-23 15:22:26
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