In this research, the analysis method of cyclic siloxanes including octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in PCPs was developed by using a gas chromatographymass spectrometry (GC/MS) method detection limits and the method quantification limits of individual cyclic siloxanes were ng/g and ng/g, respectively. | VNU Journal of Science: Natural Sciences and Technology, Vol. 34, No. 2 (2018) 56-61 Study on Determination Method of Cyclic Siloxanes in Personal Care Products Collected from Hanoi, Vietnam Tran Manh Tri*, Nguyen Le Hoai Linh Faculty of Chemistry, VNU University of Science, 19 Le Thanh Tong, Hanoi, Vietnam Received 19 March 2018 Revised 06 June 2018; Accepted 06 June 2018 Abstract: Cyclic siloxanes are widely used in beauty products as softener and polisher. However, very few studies have reported the occurrence and amount of cyclic siloxanes in personal care products (PCPs).In this research, the analysis method of cyclic siloxanes including octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in PCPs was developed by using a gas chromatographymass spectrometry (GC/MS) method detection limits and the method quantification limits of individual cyclic siloxanes were ng/g and ng/g, recoveries of surrogate compound(M4Q) and target compounds for the procedural blanks ranged from to . The recoveries of M4Q for real samples ranged from to 120% (RSD: ). The optimal procedure was appliedto measure the amount of D4, D5, and D6 in several samples of PCPs including shampoos, hair gels, and shower gels collected from retail stores in Hanoi, concentrations of D4, D5 and D6 in PCPs rangedof – , – , and – , respectively. Keywords: Siloxanes, PCPs, decamethylcyclopentasiloxane, M4Q, GC/MS. 1. Introduction linear and cyclic siloxanes. Cyclic siloxanes with twomethyl groups regarded as aliphatic chains are also called cyclomethicones. Siloxanesare widely used in consumer products due to their discrete properties like low surface tension and smooth texture. A few studiesreported the occurrence of cyclic siloxanes in personal care products at .
