The present invention is related to production of retinyl acetate generated via enzymatic conversion of retinol, said process including the use of modified enzymes with improved activity.

The present disclosure discloses a method for preparing natural delta-decalactone and delta-dodecalactone by bioreduction of Massoia Oil, which comprises (1) Strain activation, (2) Preparation of seed culture solution, (3) Fermentation and conversion, (4) Extraction, (5) Solvent recycle, and (6) Rectification.

The disclosure relates to a strain of high-temperature sensitive S. pastorianus and application thereof and belongs to the technical field of microorganisms. In the disclosure, the S. pastorianus Pilsner is mutagenized by ARTP, based on the principle that yeast intracellular alkaline phosphatase reacts with BCIP to produce blue precipitates, screening of high-temperature sensitive mutant strains can be carried out according to the appearance time and shade of the blue, and finally a strain of high-temperature sensitive S. pastorianus P-510 is obtained after screening and quickly autolyzed at 37° C. Autolysis of P-510 at 37° C. can promote the dissolution of autolysates to obtain highly flavored nucleotides, glucan and antioxidant active substances, which can be used for production of S. pastorianus autolysates with high nutritional values.

The present invention relates to a yeast strain likely to be obtained by hybridizing a strain S1 with a strain S2, said yeast strain presenting, according to test A, the following characteristics: fermentation kinetics from 15 to 22 days at a temperature of 24° C.; and resistance with an alcoholic strength of more than or equal to 15% v/v; and a nitrogen requirement of less than or equal to 200 ppm,
to the method of producing this strain and to its use.

The present invention relates to a composition for ameliorating diabetes or enhancing antioxidant activity including a yeast extract and a method for preparing the yeast extract.

The present disclosure relates to processes for producing fermentation products from starch-containing material, wherein a triacylglyceride lipase (e.g., a thermostable triacylglyceride lipase) is present and/or added during liquefaction, pre-saccharification, saccharification, fermentation, simultaneous saccharification and fermentation, or any combination thereof, to increase enzymatically accessible starch, for example by reducing starch retrogradation, and/or increase fermentation product yield, such as ethanol yield. The disclosure also relates to the use of a triacylglyceride lipase in processes of the disclosure, for example, to increase enzymatically accessible starch and/or fermentation product yield, such as ethanol yield.

A method for making a chitosan product from yeast cells is disclosed herein. Yeast cells are cultured to form a biomass of yeast cells. The yeast cells are induced to undergo meiosis causing the yeast cells to form asci containing ascospores wherein each ascospore contains a chitosan protective layer in the ascospore wall. Chitosan is extracted from the ascospores, purified to form purified chitosan, and precipitated and dried to form a chitosan product.

The present disclosure is related to the fields of biology, molecular biology, genetics, microbial fermentation, alcohol production and the like. The present compositions and methods relate to yeast strains comprising genetic modifications that results in modified yeast strains thereof comprising enhanced stress tolerance. Certain embodiments of the disclosure are therefore related to compositions and methods for increasing the efficiency of alcohol production using such modified yeast strains in fermentation reactions/processes.

The present invention is directed to compositions comprising hydrolase-secreting bacteria and fermenting microorganisms and use thereof, such as for fermentative production of ethanol.

Methods of and system for growing and maintaining an optimized/ideal active yeast solution in the yeast tank and fermenter tank during the fermentation filling cycle are provided. A new yeast stage tank is used between the yeast tank and the fermenter tank allowing yeast to rapidly produce a huge amount of active young yeast cells for a fermenter during the filling period. A measurable and useful controlling factor, % DT/% Yeast by weight ratio (or food to yeast ratio), is used (e.g., % DT=glucose), which offers information on the health status of the yeast. The controlling factor is used to control the status of the yeast throughout the entire process.