Study On Fermentation Process Of Beer Production With Syrup As Adjunct Material

China has become the largest country of beer production and sales.However,there are many problems existed in the beer industry,such as extensive production mode and low economic benefit.The technology content of beer industry should be improved to transform the existing production processes and equipments,then to enhance the quality of beer and achieve the sustainable development.Syrup is rich in monosaccharides,which could be utilized by beer yeast.In this thesis,syrup would be substituted for barley and other accessories for beer production to reduce the cost and increase the economic benefits.Firstly,several accessories were compared and it was found that syrup was the most cost-efficient accessory.Syrup brewing beer could meet the requirements of beer production,such as color,leaching rate,alpha amino nitrogen and other indicators.The addition ratio of syrup was optimized as 50%.During the fermentation process,sugar content decreased quickly,yeast cell could sedimented fastly,and diacetyl content was low,which meet the requirements of beer quality,The color,foam and other indicators of beer product could fit the international standard.In addition,the content of higher alcohol was moderate.The taste and appearance of beer product tasted good.Secondly,based the original techniques,the beer fermentation process with syrup addition was optimized.The best fermentation conditions were as follows,temperature of 13 ?,initial sugar degree of 12 °P,inoculation amount of 10%,syrup addition amount of 50%,initial alpha amino nitrogen content of 190 mg/L.After 8 days fermentation under these conditions,sugar degree was 3 °P,diacetyl content was 0.2 mg/L,yeast cell number was 5.8*108/mL,the higher alcohol content was 52.5 mg/L.The shelf life of syrup beer was longer than that of ordinary beer by one month.And the appearance,taste,physical and chemical indicators could meet the needs of fresh beer product.Finally,the bubble holding property of syrup beer was optimized.By comparing five common foaming agent with single factor and variance analysis,the best addition ratio was found as Protease A inhibitor 50 mg/L,Arabia gum 200 mg/L,soybean protein 800 mg/L.Under these conditions,the bubble holding capacity was 523 S.The results of cost analysis indicated that the beer fermentation with syrup addition could reduce the cost and improve the economic benefits significantly.