Determination of diacetyl in liquors by high performance liquid chromatography coupled with precolumn derivatization using 3,3'-diaminobenzidine

doi:10.3724/SP.J.1123.2017.04031

Abstract

Abstract:

A method was developed for the determination of diacetyl in liquors by high performance liquid chromatography-ultraviolet (HPLC-UV) coupled with precolumn derivatization using derivatization reagent 3,3'-diaminobenzidine (DAB). Diacetyl reacted with DAB at room temperature for 10 min. Then the separation was carried out on a high performance liquid chromatograph equipped with a diode array detector (DAD). A Shim-pack VP-ODS (250 mm×4.6 mm, 4.6 μ m) column was employed using water-methanol mobile phases for gradient at a flow rate of 0.7 mL/min and detection wavelength of 254 nm. The method showed a good linearity at diacetyl concentrations from 0.20 μ mol/L to 180 μ mol/L with the correlation coefficient (R²) of 0.999. The limit of detection (S/N=3) and limit of quantification (S/N=10) were 0.09 μ mol/L and 0.20 μ mol/L, respectively. The intra-day precision (RSD) was 1.28% (n=6). The method was further evaluated in the analysis of liquor samples with the recoveries ranging from 92.0% to 103.6% and RSDs from 0.69% to 3.45% (n=3). The method is well suitable for the measurement of diacetyl in liquor samples.

Key words: 3,3'-diaminobenzidine (DAB), diacetyl, high performance liquid chromatography (HPLC), liquors, pre-column derivatization

CLC Number:

O658

WANG Xinjie, WANG Jiyu, LI Heng, HUI Xian, GAO Wenyun. Determination of diacetyl in liquors by high performance liquid chromatography coupled with precolumn derivatization using 3,3'-diaminobenzidine[J]. Chinese Journal of Chromatography, 2017, 35(8): 837-842.

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