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前言乳清液为鲜牛奶分出奶油和制取干酪后的剩余物,含有较高的盐分,以前一直当作废液排放掉。这不仅严重污染了环境,而且也造成了很大浪费,后来许多国家把乳清液再经浓缩喷雾干燥后制成含盐的乳清粉,以作它用。但终因高盐含量而使其应用受到很大的限制,一般仅作动物饲料之用。 相似文献
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Isothiocyanates(ITCs) extracts were prepared from fresh broccoli.Their antioxidant properties were evaluated by using the in vitro bioassays,including superoxide anion radical( 2 O·-) ,hydroxyl radical(HO·-) and 2,2-diphenyl-1-picrylhydracyl(DPPH·) radical-scavenging methods,lipid peroxidation assay,and reducing power assay.The ITCs extracts exhibited significant dose-dependent antioxidant activities(P0.01) .Its antioxidant-stability was affected by temperature and storage condition,although it was more stable than vitamin C(Vc) .GC-MS iden-tified sulforaphane in the ITCs extracts.The antioxidant activity of sulforaphane was approximately one tenth to one fifth of that of Vc.Sulforaphane was experimented to be one of dominating contributors to antioxidant capacity of ITCs extracts.However,there was no direct antioxidant activity found for benzyl isothiocyanate(BITC) in vitro. Therefore,it could be concluded that the general group(-N=C=S) was not the essential part for the antioxidant activity of sulforaphane.It is suggested that the ITCs extracts from broccoli can be developed into a promising food additive for healthy food. 相似文献
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响应面设计优化西兰花种子异硫氰酸酯制备技术 总被引:1,自引:0,他引:1
为获取西兰花种子中异硫氰酸酯的提取技术,采用响应面设计(RSD)优化提取工艺参数.通过中心复合试验设计,建立三因素五水平的响应面分析方法和回归模型.经Minitab15软件分析数据,得到西兰花种子中异硫氰酸酯的最佳提取工艺条件:浸提温度42℃,浸提pH 7.2,浸提时间63min.验证试验中异硫氰酸酯得率0.338%,与模型预测结果相符. 相似文献
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通过胰蛋白酶和中性蛋白酶的水解比较实验,以及风味蛋白酶的复合水解实验,研究了乳清蛋白肽的酶解及其产生苦味的修饰方法,并以此进行了发酵饮料的制备.结果表明,最佳水解酶组合为胰蛋白酶和风味蛋白酶,水解条件分别为:胰蛋白酶[E/S]=1%,pH=8.0,温度45℃,时间45 min;风味蛋白酶[E/S]=2%,pH=7.0,时间2 h,温度50℃;而中性蛋白酶与风味蛋白酶组合则不理想,乳清蛋白水解液苦味浓,风味蛋白酶消除苦味效果也不明显;乳清发酵的水解液与发酵液按蛋白质量分数的最佳配比为1:1,能有效解决色泽与风味问题,使饮料保留乳制品特有的乳白色. 相似文献
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