Homemade wine is not "clean"

In recent years, more and more people are trying to buy grapes to make wine at home, so that they can not only taste the good wine, but also enjoy the fun of doing it by themselves However, experts say that home-made wine seems to be healthy and safe, but there are a variety of little-known hidden dangers How about the quality of home-made wine? Bao Xinchun, vice president of Chaoyang District Food Association, said that methanol and fusel oil may be hidden in his own wine, both of which are toxic to the body Methanol and fusel oil are mainly produced from raw materials On the one hand, pectin in grape skin decomposes methanol under the action of pectinase or heat energy, and a large amount of methanol will be produced by mildew The more thorough fermentation, the higher methanol content will be At the same time, the protein in grape is hydrolyzed to amino acid, and then the fusel oil is produced by enzyme catalysis At present, methanol and fusel oil have not been removed in the process of home brewing wine, so it is easy to produce such harmful substances in home brewing At the same time, there will inevitably be a lot of bacteria in the brewing process If it is brewed by large-scale enterprises, it will be totally enclosed disinfection, but home-made can not solve this problem "The whole process of home-made wine did not undergo complete industrial sterilization Strict sanitary disinfection conditions, hand washing has a good sense of hygiene, and it is easy to cause microorganism exceeding the standard; in addition, the wine may not be sealed for storage, and it is easy to cause pollution due to improper storage." Dong Jinshi, an expert on food safety, said Don't drink too much home-made wine Is it safe and delicious? Dong Jinshi introduced that it is very important to choose the grape variety first Many homebrew enthusiasts will choose fresh grapes for wine making instead of grapes for wine making If the sugar content of fresh grape is not enough, the alcohol content may not be enough during fermentation, so it is difficult to inhibit the growth of some miscellaneous bacteria The sanitary condition of home-made wine is also very important One grape should be washed carefully, and then the grapes should be broken up and capped The alcohol in the wine is produced by the action of Saccharomyces cerevisiae It should be placed in a warm place to wait for the first natural fermentation of the grapes, and then it should be changed to another pot or bottle for "second fermentation" after 6-18 days It is better to use glass material The second fermentation time is about one week The wine after static clarification should be stored in a new bottle at low temperature The bottle for storing wine must be clean and sanitary to avoid infection with foreign bacteria However, Dong Jinshi also reminded that due to the constraints of production environment and technology, it is difficult to ensure the quality of home-made wine It is not recommended to make wine at home, and it is better to drink less at ordinary times The famous wine expert Liang Jingzhi recommended the following points for us: 1 Appearance: see if the label printing of wine bottle is clear If the hole on the bottle seal of Mingzhuang liquor turns black, it is likely that the wine has been poured; in many countries, the wine bottle is of special shape or with code, and the appearance of domestic bottle and imported bottle is different 2 Liquor body: the liquor is thick ruby red, without pungent alcohol taste, with serious sour taste, indicating that the liquor body has gone bad (this phenomenon may also occur for the regular liquor due to improper preservation) If there is a little precipitation at the bottom of the bottle, it is normal 3 Wine stopper: whether the name and year of the winery on the oak wine stopper are the same as the words on the bottle label 4 Taste: normal wine is smooth through the throat, full-bodied aroma, clear layers If there is a problem with the wine is there will be an abnormal sense of stimulation, wine body is light, the level is not obvious 5 Precautions: it is very risky to choose an import enterprise engaged in long-term standardized operation to purchase the original bottle of imported wine, and choose an informal channel to purchase the wine in an attempt to be cheap (especially Mingzhuang wine) All imported wines shall have the declaration documents issued by the customs of the people's Republic of China and the health certificate issued by the entry inspection and Quarantine Bureau of the people's Republic of China.