The resolution of DL p hydroxyphenylglycine into its D and L isomers was studied by using aromatic sulfonic acid as resolving agent and water as solvent.

以水为溶剂，取代芳磺酸为拆分剂，用诱导结晶法，经成盐、拆分、水解过程，将DL-对羟基苯甘氨酸拆分成D-对羟基苯甘氨酸。

youdao

The following table is based on the guidelines of ASTM D 2855, "Standard Practice for Making Solvent-Cemented Joints with Poly Vinyl Chloride (PVC) Pipe and Fittings".

下表以美国材料实验协会ASTM D 2855“聚氯乙烯（PVC）管道和管件液状粘固剂连接标准规程”有关标准制定。

youdao

The degree of deacetylation of chitosan was determined directly by 1st derivative UV spectrophotometry using hydrochloric acid as solvent and N acetyl D glucosamine (ACGLSM) as standard.

以盐酸为溶剂，N 乙酰基D 葡萄糖胺为标准品，用紫外一阶导数光度法直接测定壳聚糖的脱乙酰度。

youdao