基于串联SPE净化和GC-HRMS技术测定母乳中溴代二噁英/呋喃

[背景]溴代二噁英/呋喃(PBDD/Fs)主要来源于溴代阻燃剂的排放。随着近几十年来溴代阻燃剂的大量使用,环境中的溴代二噁英/呋喃的含量逐渐增高。[目的]建立快速、准确测定母乳中13种溴代二噁英/呋喃的气相-高分辨质谱(GC-HRMS)检测方法。[方法]将母乳冷冻干燥后,经加速溶剂萃取仪提取,分散固相萃取除脂,串联固相萃取净化和气相-高分辨质谱检测,同位素稀释法定量。[结果]本方法的检出限为0.002~0.012 pg/g(以50 g样品计);具有良好的线性范围,决定系数(R2)>0.99;准确度和精密度实验结果显示,低浓度和高浓度的加标回收率分别为71.8%~101.8%、80.5%~97.8%,相对标准偏差(RSD)< 10%。基于本方法,测定了40份上海地区的母乳样品,PBDDs没有检出,PBDFs有2,3,7,8-四溴代二苯并呋喃(2,3,7,8-TetraBDF)、1,2,3,4,6,7,8-七溴代二苯并呋喃(1,2,3,4,6,7,8-HpBDF)和八溴代二苯并呋喃(OBDF)共3种化合物检出,检出率分别是72.5%、100%和67.5%。[结论]所建方法用于测定母乳样本中PBDD/Fs,结果表明该方法快速、准确、高效、可靠,为开展PBDD/Fs暴露风险评估和毒理学研究提供了方法学支持。

超临界CO_2萃取法与水蒸气蒸馏法提取垂丝海棠叶挥发油成分及其抗氧化活性的比较

目的比较以超临界CO2萃取与水蒸气蒸馏法提取的垂丝海棠叶挥发油成分及其抗氧化活性的差别。方法采用超临界CO2萃取法和水蒸气蒸馏法从垂丝海棠叶中提取挥发油,气相色谱-高分辨质谱(GC-HRMS)法对其成分进行分析,归一法确定其相对百分含有量。结果从超临界CO2萃取的挥发油中鉴定出30个成分,占总离子流图峰面积的65.72%;从水蒸气蒸馏法提取的挥发油中鉴定出27个,占91.96%。两种挥发油中有9种共同成分。另外,超临界CO2萃取法所得的挥发油对DPPH自由基和Na NO2的清除能力均强于水蒸气蒸馏法所得的挥发油和维生素C。结论两种不同提取工艺下垂丝海棠叶挥发油成分的差别较大,超临界CO2萃取中挥发油成分抗氧化活性较强。

Biologically active components for cosmeceutical use extracted from Chaetomorpha aerea

Background:The utilization of seaweed-based biologically active components in cosmeceutical formulations has been extensively rising due to skin health-promoting effects.Seaweeds have varieties of biologically active components and possess potential benefits in skincare products.Methods:Hence,the present study was done to characterize the bioactive constituents of green seaweed Chaetomorpha aerea by using the gas chromatography coupled with high-resolution mass spectrometry technique in ethanolic and methanolic extracts for presenting its cosmetic potential.Results:In analysis,a total of twenty-one different components were found in both the extracts.Their cosmetic potentials have been studied based on previous research studies.In addition,we characterized 9-octadecenoic acid[Z]-,phenylmethyl ester which belongs to benzyloxycarbonyls class.This compound exhibits promising applications in the cosmeceutical sector.This compound has a target peak percentage area(16.64%)with a retention time(39.1 min)in methanolic extract.Conclusion:The incorporation of seaweed-based bioactive components in cosmetics has been extensively growing due to its skin health-promoting effects.