Abstract:

Purge and trap technique was used for enriching the volatile components of the leaves of different variants of Perilla L. prior to GC-MS analysis. Area normalization method was employed for the subsequent quantification. The results showed that there were significant differences in type and relative contents of volatile components among 4 samples belonging to 3 variants of Perilla L.. Totally 31 volatile components were identified in the samples, 3 of which, namely [Z]-3-hexenal, caryophyllene and santolina triene were contained in all of the samples. The main components of the leaves of wild growing P. frutescens (Linn.) Britt. var. acuta (Thunb.) Kudo included limonene (77.90%), caryophyllene (14.33%), [Z]-3-hexenal (4.9%), and 3-methyl-6-[1-methethyl]-2-cyclohexen-1-one (1.71%), those of the leaves of P. frutescens (Linn.) Britt. var. crispa (Benth.)H. W. Li caryophyllene (30.65%), limonene (24.60%), [Z]-3-hexenal (21.82%) and perilla aldehyde (17.70%), and those of the sample No.1 of P. frutescens (Linn.)Britt. var. frutescen from Anguo, Hebei province 5-ethylidene-1-methyl-cycloheptene (52.79%), [Z]-3-hexenal (19.98%), caryophyllene (13.60%) and perilla aldehyde (9.46%), and those of the sample No.2 of P. frutescens (Linn.)Britt. var. frutescen from Linshan, Guangxi autonomous region perilla aldehyde (31.86%), 5-ethylidene-1-methyl-cycloheptene (31.68%), [Z]-3-hexenal (21.50%) and caryophyllene (10.47%).

Key words: purge and trap technique, GC-MS, Perilla L., volatile substances, relative content