1、Shanxi Liuqing Pharmaceutical Co., Ltd is the Largest phenolphthalein manufacturing factory in China. Produce 1000 tons of phenolphthalein, yellow phenolphthalein is 1000 tons per year.
2、Acid calibration potassium hydroxide, to phenolphthalein as indicator.
3、Objective:To set up a method for the detection of the content of phenolphthalein in phenolphthalein tablets and elimination of the foreign matter fluorane and excipients.
4、Soluble in water, its aqueous solution is strongly alkaline, can phenolphthalein red.
5、Heated absic urine contained phenolphthalein,the red color disappeared,the cloudy degree dropped,after cooled down,the red color recovered.
6、In order to increase reliability using phenolphthalein solution to detect alkaline cell sealing characteristics, the water in the alcohol was decreased, environment humidity were requisite.
7、The solubility parameter of phenolphthalein poly (ether sulfone) (PES-C) was determinated by using turbidity titration method, and estimated by using group contribution method.
8、A kinetic method for the direct determination of CO_2 in gaseous phase is proposed, based on fading the phenolphthalein when CO_2 dissolves in dilute aqueous solution of NaOH.
9、Methods: a model of cathartic colon was constructed by gastric infusion with rhubarb or phenolphthalein in rats. the transit function of colon was measured by chinese ink expulsion test;
10、After added to acetic acid or hydrochloric acid,there was trace air bubble,if added to over acid,it would appear white cloudy,the acid urine contained phenolphthalein was heated,the cloudy did not disappear,added to acetic acid or hydrochloric acid,the cloudy degree did not change.
