Abstract:
The study was about the production of flavoring agent powder from onion oleoresin by encapsulation. In order to improve and develop the production process of noion flavoring.onion was extracted with solvent and hydrating the solution the solution to turn it into powder by comparing 5 technologies of encapsulation :extruder,oven,spray dryer,freeze dryer,and spouted bed. Solvent extraction of onion flavoring was the mixture of ethanol and hexane with 5 ratios of 100:0,75:25,50:50,25:75, and0:100. The results showed that the ethanol:hexane at 100:0 could extract oleoresin in the highest yield of 45.8% and color of the extracted was dark yellow. Major volatile compounds in oleoresin were 2,4-dimethylthiophene,dimethyl sulfide,dipropyl disulfide and dimethyl trisulfide.Althought %yield of encapsulamt of onion oleoresin with spouted bed process was low (39.8%), the onion oleoresin encapsulant had a high dissolve at 69.47% and good appearance of light yellowish coloe.Morphogical characteristic.by the scanning electron microscopy(SEM),showed that encapsulation with spouted bed was round but dent with smooth and uncracked surface.Volatile compound of onion oleorsin encapsulations with the spouted bed gave higher profiles of major compound than those with extruder,oven,spray dryer,freeze dryer,and spouted bed.
Development of noion oleoresin encapsulation with spouted bed showed that oleorsin concentration at 10% and drying temperature at 60 C gave the highest%yield of the encapsulant at
36.63%. Results also showed that the morphological characteristic of encapsulant using high temperature of drying process was round shape and smooth surface ones. Analysis of the proper conditions for encapsulatihg onion oleoresin with response surface methodology (RSM) could be seen that the best condition was the usage of spouted bed with 10% oleoresin and temperature at 60 C. Finally, onion oleoresin power added in soup at 30% and on with seaweed flavored snack of 10% was sensory evaluation. It was found that the soup and snack receive the physical appearance, colour, aroma and overall acceptances scores but not different (p>0.05) from the product added with commercial onion power. Shelf life of onion oleoresin power showed that it could be kept longer than 3 month with no changes in term of solubility, colour, physical appearances, and major volatile compounds such as 2,4-dimethylthiophene, dipropyl disulfide, dimethy trisulfide, acetic acid, pyruvic acid, and furfuryl alcohol.