One, introductive
As the ceaseless development of Chinese economy, of people living standard rise ceaselessly, bigger and bigger to the demand of beer, also rising ceaselessly to the requirement of beer quality. The stand or fall that microzyme plants is having crucial effect to the quality of beer, can say yeast is the soul of beer. The beer of high quality needs the microzyme with good performance to plant of course.
Choose admirable microzyme to plant, want to consider its character integratedly, include progenitive faculty, ferment content of speed and ability, metabolization is opposite the integrated gust of the beer of the stability that the influence of beer gust, yeasty viability, microzyme plants and production. Because admirable microzyme plants this seed selection,become the need of the beer line of business that current high speed expands. The breeding to microzyme individual plant and choose experienced by shallow to difficult process, from the growth with yeasty basis metabolization and it is better to ferment ability departs bacterium is planted, arrive to change through luring undertake filtration, the cross that goes up to cellular level again. Current, develop as the high speed of biology technology, on the foundation that analyses yeasty metabolization adequately, come through molecular method the project bacterium that compose builds yeast, the function that makes yeast has more people to hope is undertaking. This is improving the quality of beer greatly, brought very big advantage and opportunity to beer industry.
General to the operation of yeasty gene component is two paces: It is the metabolization process that will analyse a cell through metabolization project, will seek the most possible the most probable cause, undertake through gene project gene is operated next, alter the gene structure, gene that delete gene or guides. Recombine a technology to change the genetic character that microzyme plants through gene at present, make it has the certain and good character that produces a need, obtained very great progress in a lot of respects. The gene that has to yeast transforms have below a few sides:
1.To carbolic source make full use of
aspergillus bacterium (Aspergillus Niger) with lactic acid Ke Luwei yeast (Kluyveromyces Marxianus) B- breeds partly carbohydrate glucoside is enzymatic turn into brew yeast, make yeast OK efficient alcohol of lactose translate into.
Will crack breed yeast (Schizosaccharomyces Pombe) malic acid connects fully enzymatic gene to turn into beer yeast, the degradation apple that makes yeast OK and successful is acerbity.
gemma bacili (Bacillus Amyloliquefaciens) the gene of encode amylase and bacterium of pneumonic Ke Lei (Klebsiella Pneumoniae) the gene of amylase of encode Pu candy turns into beer yeast, make yeast uses starch and artificial gum effectively.
Will truncal Bi Chi is yeasty (Pichia Stipitis) xylose is reductive enzymatic gene XYL1 and XYL2 turn into beer yeast, make its can use xylose.
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