Induction of erythroid differentiation in K562 cells and natural killer cell-mediated lysis: distinct effects at the level of recognition and lysis in relation to target cell proliferation

The erythroleukemic K562 cell line was induced to erythroid differentiation by a variety of agents, including hemin, bleomycin, and cytosine arabinoside. The sensitivity of induced cells to binding and lysis by non-sensitized peripheral blood mononuclear cells (MNC) in agarose was studied in relation to the target cell division rate. Differentiated K562 cells formed a lower proportion of conjugates with MNC, when compared with non-induced controls. The reduction correlated significantly with the level of differentiation, irrespective of the inducer and the proliferative status. The differentiation-induced alterations of lysis, however, were strongly influenced by the modification of target cell growth rate which was caused by the differentiating agent. These data suggest that target cell differentiation has distinct effects upon the steps of recognition and lysis by natural killer cells.     

Polyamines in Trichomonas vaginalis

Trichomonas vaginalis was grown in a modified Bushby's medium and putrescine, spermidine and spermine levels were determined in extracts from 24- and 48-h cultures and also in the culture media. All three polyamines were present in T. vaginalis extracts; the putrescine level and putrescine/spermidine ratio were much higher than those reported for other protozoa or for mammalian tissues. There were no significant differences between 24-h and 48-h amine levels per mg protein in these extracts, but amine levels per cell were higher at 24 than at 48 h. The spent culture media had a much higher putrescine content than corresponding uninoculated media and it was concluded that T. vaginalis secreted putrescine into the culture medium.     

A TLC screening program for 170 commonly used pesticides using the corrected Rf value (R f c value)

Summary This article reports TLC data (corrected R_f values; R _f ^c values) of 170 commonly used pesticides which are regularly encountered in toxicological analysis. Silica gel was used as the stationary phase and three binary systems were chosen as solvents.     

薄层扫描法测定山茱萸中马钱素的含量

用薄层扫描法直接测定中药山茱萸中马钱素的含量,可作为山茱萸中药的质量评价指标。     

薄层扫描色谱法测定洗剂中苯甲酸苄酯与邻苯二甲酸二丁酯的含量

采用双波长薄层色谱扫描法同时测定复方苯甲酸苄酯洗剂中苯甲酸苄酯与邻苯二甲酸二丁酯的含量，点样后能将本品中两个有效成分很好地分离，在ＧＦ２５４板上，经甲苯∶二氯甲烷（２∶１）混合溶剂展开，反射锯齿扫描测定，λｓ２３５ｎｍ，λＲ２６０ｎｍ，以外标两点法定量。苯甲酸苄酯与苯二甲酸二丁酯测定的线性范围分别为６．０～３０．０μｇ和１０．０～５０．０μｇ。方法可行，结果满意。     

复方丹参胶囊质量控制标准研究

采用 TLC法鉴别复方丹参胶囊中高原丹参、三七及冰片 ;利用薄层扫描法测定高原丹参中丹参酮 A的含量 :甲醇提取液点样 ,石油醚 -醋酸乙酯 -冰醋酸 ( 8∶ 2∶ 0 .5)展开两次 ,4 80 nm扫描法测定。 5批样品每粒胶囊均含丹参酮 A0 .4 59～ 0 .557mg。     

消炎解毒丸质量标准的研究

目的 建立消炎解毒丸的质量标准,为本产品提供完善、可控的质量标准.方法 采用薄层色谱法鉴别消炎解毒丸中的金银花、防风、连翘、甘草;采用HPLC法测定咖啡酸质量分数,色谱柱为DIKMADiamonsil C18柱(250 mm×4.6 mm,5μm),流动相为甲醇-磷酸缓冲盐(体积比23∶77),检测波长为323nm,柱温为40℃.结果 在薄层色谱中检出金银花、防风、连翘、甘草,各药材薄层色谱斑点清晰,阴性无干扰;HPLC法测定中咖啡酸在0.031 2～0.780 0 μg范围内线性关系良好(r=0.999 95),平均回收率为99.52％,RSD值为1.53％(n=6).结论 本方法快速、简便、精密度好、灵敏度高,提高了消炎解毒丸的质量控制标准.     

十八味诃子利尿丸中小伞虎耳草的TLC鉴别及羟基红花黄色素A的HPLC测定

目的：建立十八味诃子利尿丸的定性定量方法。方法：通过薄层色谱对小伞虎耳草进行定性鉴别,采用HPLC测定羟基红花黄色素A的含量。结果：通过TLC法可鉴别小伞虎耳草活性成分原儿茶酸的特征斑点;羟基红花黄色素A在（0.46~2.31）μg范围内线性良好,r=0.999 9。结论：建立的鉴别方法专属性强,定量方法准确,可有效控制该药的质量。     

粉刺净胶囊剂质量控制研究

采用薄层色谱法对制剂中的大黄、赤芍进行了定性鉴别 ;用消化—配位滴定法对硫酸锌进行了含量测定 ,方法简便 ,专属性及重现性好 ,可作为该制剂的质量控制指标。     

归芍通丸的制备及临床应用

目的：研究归芍通丸的制备及质量控制方法，并观察其临床疗效。方法：通过薄层色谱法对处方中当归、赤芍进行定性鉴别，并对638例不孕症患者进行临床观察。结果：制备方法简便，质控方法可行，临床应用总有效率94．98％。结论：归芍通丸质量稳定，疗效可靠。