Analysis of Organic Acids and Flavoring Compositions Extracted from Distiller's Grains

The flavoring compositions of the distiller's grains were analyzed by headspace solid phase micro-extraction-gas chromatography-mass spectrometer(HS-SPME-GC-MS),44 flavoring compositions were identified. The extracts of the distiller's grains(3.87% acids content)was clear after membranes clarification. The flavoring compositions of the extracts were analyzed by HS-SPME-GC-MS,20 flavoring compositions were identified. 8 organic acids of the extracts were analyzed by high performance liquid chromatography(HPLC),and the lactic acid content was 1.84%. The lactic acid was further extracted by molecular distillation,and the distilled product were analyzed by HPLC,and the lactic acid content reached 24.1%. The results showed that the lactic acid can be extracted by molecular distillation.