硫代异硫氰酸

The reaction of calcium L-threonate with hydrogen bromide in acetic acid readily yields (2S, 3S)-2, 4 -dibromo-3 -hydroxy butanoic acid which was further converted into methyl (2s, 3S)-2,4-dibromo-3-hydroxybutanoate by treatment of methanol.

在化合物12上引入氨基甲酰基可用二氯磷异氰酸酯、氯乙酰异氰酸酯或氯磺酰异氰酸酯，随之引入的二氯磷酰基、氯乙酰基或氯磺酰基可分别用碳酸氢钠、N-甲基二硫代氨基甲钠或亚硫酸钠脱去。

This is because of the high concentration in Brassicas of substances known as glucosinolates which are metabolized to cancer preventive substances known as isothiocyanates.

这是因为其中含有高浓度的硫代葡萄糖酸盐，它可以代谢成癌症的预防性物质：异硫氰酸盐。

This is because of the high concentration in Brassicas of substances known as glucosinolates which are metabolized to cancer preentie substances known as isothiocyanates.

这是因为其中含有高浓度的硫代葡萄糖酸盐，它可以代谢成癌症的预防性物质：异硫氰酸盐。

However before this research it was not known how the glucosinolates and isothiocyanates were influenced by storage and cooking of Brassica vegetables.

而在本研究之前，并不清楚硫代葡萄糖酸盐和异硫氰酸盐会因为甘蓝菜的储存和烹饪而受影响。

Isothiocyanates are their degradation products,which have shown a series of biological and chemical characteristics.

硫代葡萄糖甙是存在于十字花科植物中的次生代谢产物，可作为杀虫剂、抗微生物制剂和天然熏蒸消毒剂，其降解产物异硫氰酸酯除具有强烈的辛辣气味可作为调味品外，还具有抑菌、抗病毒和抗癌活性。

Howeer before this research it was not known how the glucosinolates and isothiocyanates were influenced by storage and cooking of Brassica egetables.

而在本研究之前，并不清楚硫代葡萄糖酸盐和异硫氰酸盐会因为甘蓝菜的储存和烹饪而受影响。

Furthermore, recent res earches have found out that isothiocyanates have the anticancer effects by usi ng the inhibiting and repressing factors.

近年来的研究发现，异硫代氰酸盐以阻遏和抑制因子发挥抗癌作用。

Glucosinolates and myrosinase are present in the vacuoles and in the de finite protosome in intact cell and tissues respectively. but when tissues and c ells are damaged, myrosinase will release and hydrolyze glucosinolates to genera te degraded products, such as isothiocyanates and so on.

在完整的植物中，硫代葡萄糖苷存在于细胞的液泡中，葡萄糖硫苷酶存在于特定的蛋白体中，两者相互分离，但当组织和细胞受到损伤时，葡萄糖硫苷酶就会被释放出来，葡萄糖硫苷酶将硫代葡萄糖苷水解，产生异硫代氰酸盐等降解产物。

Objective: to extract pungent flavours from the abandoned mustard skin.To study in the optimum hydrolytic conditions of glucosinolates in mustards skin.

目的：从废弃的芥菜皮中提取辛辣风味物质(硫代葡萄糖苷酶解产物异硫氰酸酯)，研究其最佳水解条件，为天然调味品生产提供新的原料来源和理论参考。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。