Determinación microanálitica de colesterol total en tejidos

En los estudios clínicos de drogas hipolipemiantes y en otros, se describe1,2 que los incrementos de colesterol total y el asociado a las LDL-C constituyen factores de riesgo principales para padecer de atereosclerosis y enfermedades asociadas a ellas, tales como infarto cardíaco, accidentes vasculares encefálicos, etc

Validation of an analytical methodology for the quantitative analysis of petroleum hydrocarbons in marine sediment samples

This work describes a validation of an analytical procedure for the analysis of petroleum hydrocarbons in marine sediment samples. The proposed protocol is able to measure n-alkanes and polycyclic aromatic hydrocarbons (PAH) in samples at concentrations as low as 30 ng/g, with a precision better than 15% for most of analytes. The extraction efficiency of fortified sediments varied from 65.1 to 105.6% and 59.7 to 97.8%, for n-alkanes and PAH in the ranges: C16 - C32 and fluoranthene - benzo(a)pyrene, respectively. The analytical protocol was applied to determine petroleum hydrocarbons in sediments collected from a marine coastal zone