摘要:

A rapid and simple reverse phase liquid chromatographic method has been developed for the simultaneous quantitation of anticancerous drugs vincristine, vinblastine and their precursors catharanthine and vindoline. Peak purity evaluation of these compounds in plant extract has also been studied using photo–diode array–UV detector.

ISSN:1082-6076    

DOI:10.1081/JLC-100101476

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A quantitative method using preadsorbent chemically bonded C18reversed-phase silica gel plates with fluorescent indicator, automated sample application, and computer-controlled UV absorption densitometry has been developed for the determination of the sunscreen ingredient oxybenzone (OB) in lotions. Nine sunscreen lotions were analyzed to test the proposed method and assess the relationship between OB content and the SPF value stated on the labels. It was found that the amount of OB in the lotions tested ranged from 0.796–6.03% (SPF 4–45). Precision (RSD) was 2.2% for replicate analysis of four sample solutions of one lotion on one plate and 4.6% for four analyses of one sample solution on different plates. Errors from spiked blanks and standard addition analyses to validate accuracy were 0 and 0.67% for the two blanks and 1.3% for the standard addition validation.

ISSN:1082-6076    

DOI:10.1081/JLC-100101477

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Several experimental approaches have been considered to address the problem of detecting and quantifying the ionic contamination in semiconductor cleanroom consumables such as wipers. A relatively new analytical technique called capillary ion analysis (CIA) appeared to us as an outstanding and convenient tool for the separation and quantification of both cationic and anionic species present in cleanroom wipers. Multiple wipers were used for extraction in high-purity deionized water to derive better sampling averages, as well as to enhance the levels of ions in solution. The resulting extract solution was preconcentrated by evaporation to further increase the signals from the released ionic species.

ISSN:1082-6076    

DOI:10.1081/JLC-100101478

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor