Study On Reducing The Content Of Higher Alcohols In Semi-dry Yellow Wine

As the traditional brewing wine,yellow wine is loved by consumers and has high nutritional value.However,the higher alcohols are inevitable by-products in the process of yellow wine brewing.Drinking rice wine is more likely to be drunk than white wine and red wine,Long term consumption of alcoholic beverages containing higher alcohol,will lead to chronic poisoning.In this paper,the new semi-dry yellow wine was taken as the research object.The main content of this study was to reduce the content of higher alcohols in the newly semi-dry yellow wine without changing the technology and quality of traditional yellow wine.(1)A method for simultaneous determination of isopropyl alcohol,isobutyl alcohol and isoamyl alcohol in yellow wine by gas chromatography was established.Chromatographic column is PE Elite-WAX ETR(30×0.25 mm×0.25 ?m)capillary column,The column temperature starts at 40?,maintaining this temperature for 4 min;heating up to 100 ? at the rate of 15?/min,maintaining this temperature for 4 min;heating up to 220 ? at the rate of 15?/min.The temperature of inlet is 250 ?,the temperature of FID detector is set as 280 ?,The flow rate of carrier gas(He)is 1 m L/min,the flow rate of hydrogen is 40 mL/min,the flow rate of air is 400 mL/min,the shunt ratio is 20:1.The method is used to detect the content of higher alcohols in yellow wine,the RSD was between 2.03%~3.96%,and the recovery rate was more than 95%,the method is effective and accurate.The content of higher alcohols in different years of natural aging semi-dry yellow wine were detected.The content of newly yellow wine was as high as 520 mg/L.Compared to the newly yellow wine,the higher alcohol content of 1 years yellow wine decreased by 15.7%,3 years yellow wine decreased by 24.8%,5 years yellow wine decreased by 29.2%,6 years yellow wine decreased by 32.5%,8 years yellow wine decreased by 35.2%.(2)Through single factor and orthogonal test,the optimum ultrasonic processing conditions were obtained: 40 min,300 W,60 kHz,30 ?.Compared with the newly brewed yellow wine,the higher alcohol content of yellow wine optimized by ultrasonic treatment can be decreased by 22.3%,slightly higher than that of 3-ageing years' yellow wine(24.8%),but less than that of 1-ageing years' yellow wine(15.7%).The newly brewed yellow wine treated by the optimal ultrasonic process,aldehydes decreased by 36%,acids decreased by 26%,esters increased by 40%,phenols decreased by 17%,The content of various volatile substances is close to1-ageing years' yellow wine,conventional physical and chemical indexes are close to 1-ageing years' yellow wine;there was no significant difference between the seven kinds of organic acid content,compareing the wine optimized by ultrasonic treatment with newly brewing yellow wine;After three weeks of storage,the wine was not found there is retrogradation phenomenon.On the whole,ultrasonic technology can reduce the content of higher alcohols in the newly brewed rice wine,preserve the original quality of rice wine,and accelerate the aging rate of yellow wine.(3)X-5 macroporous resin was selected as the adsorption material from 8 kinds of weak polar resins.In the condition of 80 rpm,30 ?,two hours of adsorption: when the content of resin is 5 g/L,higher alcohols decreased by 17.08%,decreased slightly more than 1-ageing years' yellow wine,the descend of alcoholic strength,esters,non-sugar solids were all lower than 5%,which had little effect on the quality of newly yellow wine;when the content of resin is 10g/L,the higher alcohols decreased by 29.69%,decreased slightly more than 5-ageing years' yellow wine,the decline in alcoholic strength less than 5%,non-sugar solids decreased by 6.45%,esters decreased by 15%,the quality of yellow wine within acceptable limits;when the content of resin is 15 g/L,the decline in alcoholic strength was close to 10%,non-sugar solids decreased by more than 10%,esters decreased bymore than 20%,having a significant impact on the quality of newly yellow yine.X-5 macroporous adsorption resin with excellent static adsorption conditions: 80 rpm,30 ?,10 g/L,2 h.The elution conditions of X-5 macroporous adsorption resin were as follows: 3% HCL solution was used as eluent,the rate of elution flow was 2 mL/min.After elution,the adsorption rate of X-5 macroporous adsorption resin reached 83.45%,The performance of reuse is excellent.