Study On Acetaldehyde Monitoring And Parameters Controlling In The Process Of High Fructose Syrup Production

High fructose syrup is mixed syrup constituted of glucose and fructose,which is widely used in food industry.It's source from starch.The starch is saccharified by enzymes to be saccharification liquid,and a part of glucose is isomerized to be fructose via glucose isomerase.The acetaldehyde producing in high fructose syrup was mainly due to the biochemical reaction of the microorganisms.The key control parameter in the high fructose syrup production is to control acetaldehyde content.Gas chromatography method is applied to test acetaldehyde,the resolution,limit of detection,limit of quantification,repeatability,precision,accuracy and linearity is researched to obtain the accurate and efficient parameter to test acetaldehyde.Samples at different operational units in production were collected to monitor the microorganism and acetaldehyde to find the change trend of acetaldehyde in production and the relation between microorganism and acetaldehyde.Perform research on production process for acetaldehyde to explore the method to control acetaldehyde in industrial production.The research on microorganism monitoring to vacuum-type drum filter operation environment,the feed temperature of glucose ion-exchange process,temperature of flash evaporation before isomate process,SO₂ concentration,pH after isomate process,temperature of decoloring process,and vacuum value when evaporation and concentration.Eventually to determine the optimized production process to control acetaldehyde is as:The operation environment microbial test of vacuum-type drum filter is less than 150cfu/g,the feed temperature of glucose ion-exchange process to be 58?,temperature of flash evaporation before isomate process to be 68?,SO₂ concentration to be 110ppm,pH after isomate process to be 4.0-4.5,temperature of decoloring process to be 58?,and the vacuum for evaporation and concentration to be-0.08Mpa.The above can effectively control the acetaldehyde content.The key for process control is to improve the accuracy and reliability of test method to ensure the material flow rate and production continuity to prevent the glucose liquid staying long time in the intermediate tanks to reduce and prevention the growth of microorganism to ensure the control of acetaldehyde.The study result provides guidance to make high fructose syrup production process better and improve product quality.It will have a good application prospect.