The present invention provides a production method of bioethanol for providing a method of producing biofuel from green laver which comprises the following steps: a saccharifying step processing the green laver using a hydrolysis catalyst and a hydrolysis enzyme to obtain monosaccharides; and a fermentation step fermenting the monosaccharides with Saccharomyces cerevisiae or Pichia stipites. [Reference numerals] (AA,CC) Reducing sugar(g/L); (BB,DD) Ethanol(g/L); (EE) Time(h)
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