Effect of technological parameters the process of ethanol production in the saccharification of barley

Abstract

Tenderized saccharification process is a mass of the cores in the production of ethanol from starch-containing raw materials. Saccharification of starchy raw materials needed because main production races alcohol yeast do not synthesize and amylolytic enzymes are not able to use in their metabolism Nepo-starch, facility and internalize only mono – and disaccharides. The main aim is to obtain a mash saccharification with a high content of fermentable carbohydrates. The main objective is to obtain a saccharification wort with a high con-zhaniem fermentable carbohydrates. From the course of the saccharification process, the quality of the alcohol depends on the completeness of the fermentation of starch raw materials and product yield. On saccharification sodden mass affected by temperature, pH, glucoamylase dosage and duration of the process. From these factors depend technical-economic production figures. Saccharification boiled barley weight carried glucoamylase enzyme preparation bios 800 A at the rate of 6.0 units per g starch SFS. Control is tenderized weight obtained using one enzyme preparation Alfaferm 3500 A at a dose of 1.0 units per g starch AS. Saccharification takes place at a temperature of 50–65 0 C and pH 4.0–5.5 for 120 minutes. pH was adjusted weight tenderized by making it in sulfuric acid. The saccharification process dynamics studied glucose accumulation in the barley wort in function of temperature, pH, and the dosage of glucoamylase. Samples for glucose determination were taken every 30 minutes. At a temperature of 65 0 C in the first 30 minutes of the accumulation of glucose goes fast, then suddenly slows down, it is possible due to the inactivation of glucoamylase due to changes in the structure of the enzyme molecule. The maximum amount of glucose stored at a temperature of 60 0 C and 11.1 g / cm3, which corresponds to the optimum action of glucoamylase enzyme preparation used. The concentration of hydrogen ions (pH) has a multifaceted effect on the process of saccharification. On the one hand alter H + ionization of the active site of glucoamylase conformational state and, on the other hand influence the stability of the tertiary structure of glucoamylase. Maximum glucose accumulation is observed at pH 4.5 and 11.9 g / cm3. With increasing the glucoamylase dosage increases the effective formation of enzyme-substrate complexes, and hence the rate of hydrolysis of starch. When applying multienzyme complex observed increase in the amount of glucose by 34.7%, compared with the control. The degree of starch hydrolysis increases as it becomes more accessible to the action of saccharifying enzymes by the hydrolysis of proteins and membranes barley containing hemicellulose. Application of multienzyme composition allows to reduce the consumption of glucoamylase to 4.0 units per g starch SFS, SFS instead of 6.0 units per gram of starch in control.