ABSTRACT
Abstract The aim of this study was to investigate whether anaerobic metabolites could induce volatile compounds and improve aroma of dried jujube (Ziziphus jujuba Miller). Jujube fruits were incubated in a polyvinyl chloride bag containing 5% CO2 and 95% N2 for up to 168 h at 25 °C and 3 samples were randomly removed every 6 h and oven dried to a moisture content of ≅ 20%. The volatile compounds of control and 5% CO2-pretreated Chinese jujube fruits were extracted by simultaneous distillation extraction and identified by gas chromatography-mass spectrometry(GC-MS). The acetaldehyde and ethanol contents were determined by gas chromatography (GC). The results indicated that a large accumulation of acetaldehyde and ethanol caused changes in aroma composition of dried jujube products and 5% CO2 pretreatment led to an increase in the levels of some compounds, particularly esters, acetaldehydes, and ethanol, whereas the amount of acids were decreased significantly. Principal component analysis showed that integrative scores of 5% CO2 pretreatment at 120 h were the highest, and aroma quality was better than that of the control. Relatively low concentrations of anaerobic respiration metabolites are good for jujube fruit aroma composition.
ABSTRACT
Objective To extract the volatile oil of Ramulus Mori and analyze the chemical composition of the volatile oil. Methods The volatile oil of Ramulus Mori was extracted by simultaneous distillation extraction(SDE)and direct distillation extraction(DDE)method, and the chemical composition was identified by GC-MS. Results Nineteen compounds were identified in the volatile oil extracted by SDE, which accounted for 94.49% of the total amount of detection. There were alkyl, acids, aldehydes, ketones, esters, alcohols and other substances in the volatile oil. And 16 compounds were determined in the volatile oil extracted by DDE, accounting for 97.12% of the total amount detected. There were furan, carboxylic acids, esters, aldehydes, alcohols, phenols, ketones, alkene and acyl halide. The chemical compositions of the volatile oil extracted by SDE were more than those extracted by DDE. Conclusion The chemical constituents of volatile oil of Ramulus Mori can be more fully identified by the combination of the two extraction methods.
ABSTRACT
Objective To extract the volatile oil of Ramulus Mori and analyze the chemical composition of the volatile oil. Methods The volatile oil of Ramulus Mori was extracted by simultaneous distillation extraction(SDE)and direct distillation extrac?tion(DDE)method,and the chemical composition was identified by GC-MS. Results Nineteen compounds were identified in the vol?atile oil extracted by SDE,which accounted for 94.49%of the total amount of detection. There were alkyl,acids,aldehydes,ketones, esters,alcohols and other substances in the volatile oil. And 16 compounds were determined in the volatile oil extracted by DDE,ac?counting for 97.12 % of the total amount detected. There were furan,carboxylic acids,esters,aldehydes,alcohols,phenols,ke?tones,alkene and acyl halide. The chemical compositions of the volatile oil extracted by SDE were more than those extracted by DDE. Conclusion The chemical constituents of volatile oil of Ramulus Mori can be more fully identified by the combination of the two ex?traction methods.