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将甜菊叶去梗并粉碎，有利于除去梗中所含部分杂质；粉碎后的粉末与叶子比，增加了接触面积，更有利于浸提。温度选择60℃为佳，高于60℃可能促进甜菊糖苷水解而降低得率；且热水加样比冷水加样更有利于浸提。这是因为细胞中的水解酶和微生物对甜菊糖苷有分解作用，热水加样可以杀菌、杀酶、避免了甜菊糖苷水解，从而提高提取率 活性炭加入过多，会使部分甜菊糖被吸附掉，造成损失；若加入过少，则脱色效果不明显。按糖液体积2%的量加入活性炭，用磁力搅拌器搅拌40min。用滤纸，微滤膜各抽滤2次，除去活性炭。得到的糖液近似为无色。 |
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alvarohao
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【答案】应助回帖
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爱与雨下(金币+1): 2011-12-16 11:04:36
zwly(金币+15, 翻译EPI+1): 感谢您的帮助 2011-12-16 11:17:40
爱与雨下(金币+1): 2011-12-16 11:04:36
zwly(金币+15, 翻译EPI+1): 感谢您的帮助 2011-12-16 11:17:40
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The stevia leaves were smashed with their peduncles removed, which would eliminate the impurities contained in the peduncles; comparing with the leaves, the powders had more contact areas, being easy to be leached. 60℃ is the best temperature, above which the hydrolyses of the stevia glucosides could be improved, decreasing the yield; and the hot-water is better than the cold-water, in the aspect of improving the leaching. This is because the hydrolases and the microbes in the cells had a decomposition action to the stevia glucosides, and the hot-water could kill the bacteria and the enzymes, which avoided the hydrolyses of the steiva glucosides and improved the extraction ratio. Too much activated carbon would absorb some stevias and cause a loss; but too little activated carbon would make the decoloration less obvious. The activated carbon was added by 2% of the volume of the sugar liquid, stirred for 40 min using the magnetic stirrers. The activated carbon was eliminated by filterations two times each using the filter papers and micro filter membranes, getting the almost colorless sugar liquid. |
2楼2011-12-16 10:41:13
