Studies On The Processing Technology Of Job’s-tears Seed Solid Beverage

Coix Lachryma-jobi kernel(Job’s-tears seed) is the edible and pharmaceutical resources, which is issued by Ministry of Health in China. It has been known as "the king of world gramineae" due to its high nutritional and medicinal value The resources of Coix Lachryma-jobi are very rich in China, however, they are mainly as fresh-eating and less products of deep processing, so their additional value are low. In order to raise the level of Coix Lachryma-jobi kernel processing and supply the needs of the consumer market, using Job’s-tears seed as the raw material to process Job’s-tears seed solid beverage is very meaningful in the reality.Coix lacryma-jobi L.cv. jinsha was used as material in this paper, this subject chose double-enzyme method and spray-drying technology to process the Job’s-tears seed solid beverage. The main research of this paper was to study the processing technology and the product formula. By analyzing the results of the experiments, the main results were as follows:1. After baking and crushing Job’s-tears seed, we used α-amylase and glucoamylase to hydrolyze Job’s-tears seed step-by-step, the single-factor trial test and the L9(34) orthogonal were adopted in the experimental design to optimize the enzymatic hydrolysis conditions of a-amylase and glucoamylase by taking the crude polysaccharide content and soluble solids content of enzymatic hydrolyzate as the evaluation. According to single factor and orthogonal test, the optimal parameters of the Job’s-tears seed enzymatic hydrolysis were as follows:a-amylase content 200U/g, liquefying temperature75℃, liquefying pH 5.2, liquefying time 45 min; saccharifying enzyme content 300 U/g, saccharifying temperature 65℃, saccharifying pH 5, saccharifying time 80 min. In this optimum hydrolysis process condition, the content of crude polysaccharide was 201.11 mg/g and soluble solids content was 8.60%.2. In this study, we took the enzymatic hydrolyzate of Job’s-tears seed in the optimum hydrolysis process condition as the raw material, the study based on the principle of fuzzy mathematics to establish the evaluation model and filter out the best flavorings formula. Through the orthogonal experiment, the results indicated that Job’s-tears seed solid beverage flavoring agent for the best combination were as follows:maltodextrin50%, xylitol 9%, citric acid 0.1% and milk powder with full-fat 8%, the above ratio was the percentage accounting for soluble solids quality.3. With the optimum flavorings formula of the enzymatic hydrolyzate, basing on the single-factor trial test, the stability of Job’s-tears seed beverages were studied by the orthogonal experiment. The results indicated that the optimum stabilizer ratio were sodium alginate 0.55%, CMC 0.45%, distilled monoglycerides 0.3% and sucrose esters 0.4%, the above ratio was the percentage accounting for soluble solids quality.4. Based on the optimum stabilizer and flavorings formula, the powder yield and content of water were taken as indexes. The results indicated that the.,, optimum condition of spray drying of the Job’s-tears seed solid beverage by the single factor experiment and the orthogonal experiment as follows:the soluble solids 16%, the feed flow rate 40% and the inlet temperature 190℃.In this optimum spray drying condition, the powder yield was 52.11% and the content of water was 0.94%.Through the solubility test, the results showed that preparing the water temperature of 80℃ and the Job’s-tears seed solid beverage with the water ratio of 118-1:10g/mL could obtain an acceptable reconstituted effect and flavor.