ZHANG Zhen-yong,LI Dong-yang,XIE Yi-xuan,ZHANG Chen-yuan,CHEN Min-min,XU Rui,YAN Zhen-xin,KANG Jian.Separation and Determination of 3-Cyclohexene-1-carboxylic Acid Methyl Ester and 3-Cyclohexene Carboxylic Acid by Chiral Gas Chromatography[J].Journal of Instrumental Analysis,2025,44(04):714-719.
ZHANG Zhen-yong,LI Dong-yang,XIE Yi-xuan,ZHANG Chen-yuan,CHEN Min-min,XU Rui,YAN Zhen-xin,KANG Jian.Separation and Determination of 3-Cyclohexene-1-carboxylic Acid Methyl Ester and 3-Cyclohexene Carboxylic Acid by Chiral Gas Chromatography[J].Journal of Instrumental Analysis,2025,44(04):714-719. DOI: 10.12452/j.fxcsxb.240729258.
Separation and Determination of 3-Cyclohexene-1-carboxylic Acid Methyl Ester and 3-Cyclohexene Carboxylic Acid by Chiral Gas Chromatography
A gas chromatography method has been developed for the simultaneous separation and determination of chiral 3-cyclohexene-1-carboxylic acid methyl ester(CHCM) and chiral 3-cyclohexene carboxylic acid(CHCA). The racemic CHCM serves as a substrate that can be stereoselectively catalyzed by lipase to produce the product chiral CHCA. By employing the orthogonal experimental design,the effects of chromatographic column type,carrier gas linear velocity,initial column temperature and temperature ramp rate on the enantiomeric separation of CHCM and CHCA were investigated. The analysis of variance(ANOVA) indicated that the optimal separation was achieved using an SH-
β
DEXsm chromatographic column,with a carrier gas linear velocity of 30.0 cm/s,an initial column temperature of 70.0 ℃,and a temperature ramp rate of 1.00 ℃/min. Under these conditions,the separation factor for the enantiomers of CHCM was 2.15,and for CHCA,it was 3.50. The linearity range for(
R
)- and(
S
)-CHCM and(
R
)- and(
S
)-CHCA were determined to be 3.50-350 mg/L and 15.8-315 mg/L,respectively,with correlation coeffici
ents of 0.999. The limits of detection(LODs) for the four compounds ranged from 0.550 mg/L to 3.16 mg/L,and the limits of quantification(LOQs) ranged from 1.85 mg/L to 9.56 mg/L. The recoveries for(
R
)- and(
S
)-CHCM and(
R
)- and(
S
)-CHCA at three different concentrations were between 91.4% to 97.1%,91.4% to 95.7%,89.9% to 95.6%,and 88.6% to 96.0%,respectively,with relative standard deviations(RSDs) not more than 4.7%. This method allows for the simultaneous separation of chiral CHCM and CHCA in a single injection.
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