Yeast Production

Yeast Production

 

the production of bakers’ yeast, based on the reproduction of yeasts in liquid nutrient media prepared from molasses (a by-product of sugar manufacture).

Molasses is diluted with water (in the ratio 1:4), treated with bleaching powder to disinfect it, and acidified with sulfuric acid; after nutrient salts containing nitrogen and phosphorus are added, the mixture is heated to boiling and, after precipitation of the colloids (in ten to 12 hours), it is decanted (poured off the sediment) and a transparent solution is filtered out. Yeasts reproduce in several stages and in each succeeding one the size of the yeast mass increases severalfold. Yeasts accumulated in a laboratory by the cultivation of pure cultures on malt wort then go to a pure cultures section, from which the yeast mass enters a yeast-growing apparatus to produce mother yeasts. The concentration of nutrients in the fermented medium is regulated by the entry of wort. The inflow of molasses wort and nutrient salts varies from seven to ten hours. Air is forced through an air-distributing system on the bottom of the yeast-growing apparatus (60-80 cu m per hour for 1 cu m of liquid, depending on the stage of yeast accumulation). Cold water is passed through coils in the apparatus in order to keep the medium at an optimum temperature. The process of growing commercial yeasts takes 12 hours.

Yeasts are isolated from fermented wort by separators with a capacity of 12-20 cu m per hour. The resulting thick yeast cream is diluted with cold water and separated again. The moisture from the yeast concentrate is removed by filter presses or vacuum filters. The pressed yeasts are mixed in a mixer until the mass is homogeneous and then shaped in a molding machine into 50, 100, and 1000 g bars. The packages of yeast are wrapped in paper in an automatic machine, packed in boxes, and then chilled in a refrigerator to -2°C.

References in periodicals archive ?
FILE- Minister of Manpower Mohamed Saafan - Egypt Today/Ahmed Maarouf BENI SUEF, Egypt, Dec 23 (MENA) - Manpower Minister Mohamed Saafan inspected on Sunday a yeast production factory in the medium-scale industrial zone in Beni Suef, south of Cairo, The plant's chairman welcomed Saafan during the visit, where he reviewed the production process.
Treatment aims to stop the dandruff by slowing down the reproduction of skin cells or counteracting the yeast production that might be the cause.
Gelinas, "In search of perfect growth media for Baker's yeast production: Mapping patents," Comprehensive Reviews in Food Science and Food Safety, vol.
1977 "A study of must nitrogen content in relation to incomplete fermentation, yeast production and fermentation activity." Proc.
Yeast production company Lallem and GB have installed two Babcock Wanson BWD fire tube boilers with integral economiser and BW72H control system into its Felixstowe plant--the UK's largest fresh yeast production facility for the UK baking industry.
The potential importance of yeasts in food formulations to improve human nutrition and to meet the demands in a world of low food production and rapidly growing population depicts the significant magnitude of yeast production. Keeping in view these facts and importance of single cell protein, the present study was planned to assess the potential utilization of some agricultural wastes to produce single cell protein and to determine the biological quality of produced biomass for food value-addition.
We accommodate batch and fed-batch fermentation processes for bacterial and yeast production systems.
Yeast production company Lallemand GB has installed two BABCOCK WANSON BWD fire tube boilers with integral economiser and BW72H control system into its Felixstowe plant--the UK's largest fresh yeast production facility for the UK baking industry.
Data for the knowledge analysis of industrial baker's yeast production were collected during a few years in one of the baker's yeast factory producing yeasts with higher content of ergosterol.
The major part of the non-sugar substances in molasses (molasses residuals), however, is not utilized by the yeast production and discharged unchanged to the processed wastewater, which represents the principal waste in the yeast production process.
AB Foods, which has food businesses around the world, has invested GBP586 million over the last year, expanding its fast growing Primark retail chain, grow its sugar operations in southern Africa, bioethanol production in the U.K., and yeast production in China.