首页> 外文期刊>Journal of Food Composition and Analysis >Protease inhibitor activities and isoflavone content in commercial soymilks and soy-based infant formulas sold in Ottawa, Canada.
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Protease inhibitor activities and isoflavone content in commercial soymilks and soy-based infant formulas sold in Ottawa, Canada.

机译:在加拿大渥太华出售的商业豆浆和基于大豆的婴儿配方奶中的蛋白酶抑制剂活性和异黄酮含量。

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The content of isoflavones and residual activities of soybean trypsin (SBTI) and chymotrypsin (SBCI) inhibitors in the major soymilks and soy-based infant formulas sold in Ottawa, Canada were examined. The residual SBTI activities (% whole soybean) measured as the ability to inhibit the release of p-nitroaniline from N-benzoyl-DL-arginine-p-nitroanilide by trypsin were from 6.4% to 55.6% in soymilks (8 brands), 4.2% to 8.8% in liquid formulas (4 brands) and 1.9% to 5.1% in powdered formulas (8 brands). SBCI activities (% whole soybean) measured as the ability to inhibit the degradation of casein by chymotrypsin in soymilks were from 3.5% to 33.7%. Total isoflavones measured as aglycones were from 26.4 +or- 0.18 to 55.3 +or- 3.48 mug/g wet weight in liquid formulas or 137.5 +or- 3.0 to 229.1 +or- 2.3 mug/g dry weight in powdered formulas and 49.8 +or- 0.5 to 279.9 +or- 3.4 mug/g wet weight in soymilks. Compared to soymilks, the residual SBTI activities and total isoflavones in infant formulas were lower. The residual SBTI activities in 6 out of the 8 soymilks measured were higher than the level (10%) considered being safe.
机译:检查了在加拿大渥太华出售的主要豆浆和大豆基婴儿配方食品中异黄酮的含量以及大豆胰蛋白酶(SBTI)和糜蛋白酶(SBCI)抑制剂的残留活性。通过胰蛋白酶抑制从N-苯甲酰基-DL-精氨酸- p -硝基苯胺释放 p -硝基苯胺的能力来衡量的剩余SBTI活性(完整大豆的百分比)为:豆奶(8个品牌)从6.4%到55.6%,液体配方(4个品牌)从4.2%到8.8%,粉状配方(8个品牌)从1.9%到5.1%。通过抑制胰凝乳蛋白酶抑制豆浆中酪蛋白降解的能力来衡量的SBCI活性(完整大豆的百分比)为3.5%至33.7%。异黄酮的总异黄酮含量为26.4 +或-0.18至55.3 +或-3.48杯/克湿重(液体配方)或137.5 +或-3.0至229.1 +或-2.3杯/克干重(粉状配方)和49.8 +或-豆浆湿重0.5至279.9 +或-3.4杯/克。与豆浆相比,婴儿配方食品中的残留SBTI活性和总异黄酮含量较低。测得的8种豆浆中有6种的剩余SBTI活性高于认为安全的水平(10%)。

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