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 หัวเรื่อง:ผลของอุณภูมิและความชื้อสัมพันธ์ที่มีต่ออัตราการเหลืองของข้าวเปลือกชื้น ผู้เขียน: Nirachara Srisubati, Somchart Soponronnarit, Tipaporn Yoovidhya สื่อสิ่งพิมพ์:pdf AbstractThe effects of temperature and relative humidity in storage chambers on yellowing rate of paddy were investigated and then an empirical equation for predicting the yellowing rate was developed. Paddy was conditioned using saturated salt solutions at relative humidities from 80 to 95 % and temperatures 35, 45, 55, 60, and 65?C. The yellowing rate was found to follow the zero order kinetics. The yellowing constant values (k) increased exponentially with temperature while increased linearly with water activity. The magnitude of activation energy varied from 130-145 kJ/mol. A predictive equation for determining yellowing rate was ln k = ? - ?aw - ?/T + (?aw)/T where aw is water activity (valid from 0.80 to 0.95), T is absolute temperature (valid from 308 to 338 K) and ?, ?, ? and ? are constants. The results of variance analysis showed that temperature, water activity and their interaction significantly influenced the yellowing rate of paddy. |
หัวเรื่อง:ปัจจัยที่ส่งผลต่อการอบแห้งมะละกอแช่อิ่มในอุโมงค์ ผู้เขียน:Piyarat Noosuk, Somchart Soponronnarit, Tipaporn Yoovidhya, Adisak Nathakaranakule สื่อสิ่งพิมพ์:pdf AbstractThe strategies for papaya glace’ drying in tunnel were investigated. This experiment was performed at the fourth Royal Project Food Processing Section. The optimum conditions of drying, corresponding mathematical models were also evaluate. The criteria set for this stusy included low drying time, low specific enegy consumption and acceptable qualities of papaya glace’. The drying rate obtained from the model of batch tunnel dryer were close to the experimental ones. From the mathematical models, it was found that the optimum conditions of the first step of dyring for the dimension of papaya glace’ of 3.1x7.8x1.4 cm3 and drying temperature of 70oC were specific air flow of 12 kg/h-kg dry papaya glace’ and air recycled of about 70%. In the second step of drying for the dimension of papaya glace’ of 0.98x0.98x0.98 cm3 and drying temperature of 55 oC, it was found that the optimum drying conditions were specific air flow rate of 10 kg/h-kg dry papaya glace’ and air recycled of about 80%. |
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