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There are different methods to conserve foods, and one of them is increasing the acidity. This can be achieved arti…cially with the addition of weak acids or naturally by fermentation, obtaining free additive products....

Bioethanol is one of the most important renewable fuels and it is classified into four different generations (G) based on the feedstocks used for their production: edible food crops such as rice, corn, sugarcane, wheat, ...