Determination of Reasonable Technical Parameters for Heat Treatment Oolong Tea by Microwave
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leanhduc@hcmuaf.edu.vnKeywords:
Oolong tea, microwave power, temperature, enzyme, tannin, polyphenolAbstract
The study aims to determine the relationship of technical parameters for heat treatment oolong tea by microwave (including processing time, temperature and microwave power) and inactivate enzyme, quality, nutrient of processed tea leaves (including enzyme, tannin and polyphenol content) and determine of the reasonable technical parameters for the heating process. The Kim Tuyen oolong tea is heat treated by the microwave heat treatment machine with processing time range from 280 to 380 second, temperature range from 67 to 83oC, microwave power range from 1.200 to 1.600 W. Three quadratic regression equations describe the influence of the technical parameters on inactivating enzyme and quality of product such as tannin and polyphenol were determined. The reasonable technical parameters for heat treatment oolong tea by microwave are processing time of 5.6 minutes, temperature of 73oC, microwave power of 730 W/kg of tea. At the regime, the objective functions reached the optimum including enzyme polyphenol oxidase of 11.69%, tannin reaches 21% and polyphenol reaches 22.13%. The effectiveness of heat treatment oolong tea by microwave is significantly better than by traditional method.
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