Determination of Benzaldehyde in Plant Protein Drinks by HP-SPME-GC

A method of headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography (GC) analysis was used to determine benzaldehyde in plant protein beverage. The mixture of 5.00 mL of sample and 1.50 g of sodium chloride was heated at 40 ℃ for 20 min in a 10 mL headspace-vial. The headspace gas was extracted by polydimethylsiloxane-divinyl-benzene (PDMS-DVB) extraction fiber for 50 min. Then the fiber was immediately inserted into the GC injector. The extract was desorbed at 250 ℃ for 1.0 min and separated with RTX-5 column and detected with FID. The linear relationship between the peak area and the mass concentration of benzaldehyde was in the range of 10.00-500.0 μg·L-1, with limit of quantification (10S/N) of 1.0 μg·L-1. Recovery rate measured by standard addition method was 92.6% with RSD (n=5) of 1.4%. The method was used for the analysis of benzaldehyde in commercially available plant protein beverages.