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GENMED乙酸比色法定量检测试剂盒:青出于蓝而胜于蓝
乙酸(CH3COOH)是国际纯粹(理论)与应用化学联合会(IUPAC)建议名称,在化学命名法中的系统称谓是乙醇酸,中文称之为醋酸,而无水纯乙酸则称为冰乙酸.乙酸是一种简单的弱性有机羧酸和典型的脂肪酸,普遍存在于各种食品、饮料,甚至纸业、药业和工业材料中.
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虎尿对类风湿性关节炎患者的免疫学影响
Objective To study immunologic mechanism of tiger's urine on patients of rheumatoid arthritis. Method We used ELISA method to detect TNF values of serum; we also used MTT colorimetric method to detect the inhibition of tiger's urine on T－ cell. Result TNF values of RA patient's serums at both active stage and stationary phase before the therapy were higher than those of healthy group; TNF values of patient's serums after the therapy were lower than those before the therapy; tiger's urine had obvious inhibitive action on proliferation of peripheral blood's T－ cell. Conclusion Tiger's urine could inhibit T－ cell's proliferation and TNF's secretion, which may be the important mechanism of curing RA.
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格里斯试剂比色法测定亚硝酸盐的改进
格里斯试剂比色法又称盐酸萘乙二胺法，其原理是样品经过沉淀蛋白质、除去脂肪后，在弱酸条件下亚硝酸盐与对氨基苯磺酸重氮化，再与盐酸萘乙二胺偶合成紫红色染料，与标准比较定量。GB/T 5009.33-1996食品中亚硝酸盐与硝酸盐的测定方法把格里斯试剂比色法作为第一法。 在实际操作过程中发现，该方法存在一些问题。一是按照GB/T 5009.33-1996配制对氨基苯磺酸溶液(10g/L)在室温下很难完全溶解；二是GB/T 5009.33-1996先将两种显色剂等体积混合后再加入，根据该方法的原理。亚硝酸盐先与对氨基苯磺酸重氮化，再与盐酸萘乙二胺偶合，所以两种显色剂应分别加入。针对上述问题，笔者对此法予以改进，效果良好，现报导如下。
