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asd123xukun銅蟲 (小有名氣)
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[求助]
重金求高手幫忙翻譯兩段話，食品生物技術(shù)方面的，謝謝！
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生物分子的氧化是一個自由基介導(dǎo)的過程，它會對食品和生物系統(tǒng)造成許多不利的影響。在人體器官內(nèi)，游離自由基會隨著氧代謝的過程而不可避免地產(chǎn)生，并且它會引起動脈硬化和癌癥等多種疾病。在食品中，食品營養(yǎng)成分的氧化會產(chǎn)生過氧化物，其不僅會影響食品的營養(yǎng)價值，引起食品品質(zhì)下降，嚴(yán)重的甚至還會導(dǎo)致攝入者的身體發(fā)生疾病。因此，尋找安全的抗氧化劑以抑制過氧化物產(chǎn)生一直是生化營養(yǎng)學(xué)的研究熱點。由于BHT、TBHQ等化學(xué)合成抗氧化劑比天然抗氧化劑具有更好的效果和更便宜的價格，因此其已經(jīng)被廣泛應(yīng)用于食品行業(yè)中。但是，目前有研究發(fā)現(xiàn)合成抗氧化劑對人體肝、脾、肺等器官具有蓄積性致癌作用，從而引起了人們對其安全性的擔(dān)憂，并且開始逐漸限制其在食品中的使用。于是人們把目光轉(zhuǎn)向天然抗氧化劑。α-生育酚是一種被最普遍使用的天然抗氧化劑，它能有效保持食品中油脂的穩(wěn)定性，但是卻不利于食品保存。因此，我們有必要尋找一種其它來源的安全的天然抗氧化劑。 現(xiàn)有的研究發(fā)現(xiàn)，很多不同來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、油料種子蛋白、小麥醇溶蛋白和玉米蛋白等的水解物都具有一定的抗氧化性。雖然多肽發(fā)揮抗氧化活性的機理還不是特別清楚，但是有報道稱某些芳香族氨基酸和組氨酸起到了重要作用。明膠中富含疏水性氨基酸以及其它與脂類具有較高親和性并且可以形成穩(wěn)定乳化體系的氨基酸，因此，明膠多肽被認為比其它多肽具有更強的抗氧化活性。本文旨在從鯊魚皮明膠中分離純化一種新型的抗氧化肽并對其生物活性進行研究。 [ Last edited by asd123xukun on 2011-5-18 at 18:25 ] |
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liqi9673
木蟲 (正式寫手)
- 翻譯EPI: 24
- 應(yīng)助: 0 (幼兒園)
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【答案】應(yīng)助回帖
★
sltmac(金幣+1): 感謝應(yīng)助~~ 2011-05-21 12:48:02
asd123xukun(金幣+100, 翻譯EPI+1): 2011-05-23 19:23:33
sltmac(金幣+1): 感謝應(yīng)助~~ 2011-05-21 12:48:02
asd123xukun(金幣+100, 翻譯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樓2011-05-20 09:46:04
zuodg
鐵桿木蟲 (正式寫手)
有為青年
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【答案】應(yīng)助回帖
asd123xukun(金幣+100): 2011-05-23 19:23:37
|
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樓2011-05-23 15:22:26
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