甘薯薟平衡相對濕度特性之研究

Abstract

此研究以平衡相對濕度測定法量測兩種乾燥溫度之樣本在五固定溫度環境下之去濕與吸濕數據。以適稱性和預測能力為標準評估適合之ERH模式。修正Halsey公式與修正Oswin公式為適用模式。以此研究結果與文獻資料比較，顯示品種影響了此ERH物性。自文獻所得高澱粉之產品如馬鈴薯與樹薯之ERH數據其適用模式在此研究完成評估比較。由殘差圖顯示GAB公式並不適用，該公式之參數無法以指數函數表示溫度之影響。此研究推導一簡易公式：RH=A+B/M+C×T/M，可做為此研究之甘薯簽ERH/EMC數據之適用模式。 The equilibrium relative humidity of sweet potato slices with two drying temperatures and different history were measured by ERH determining technique at temperatures ranging from 5 to 50℃. The adequate ERH model and its estimated parameters were evaluated by its fitting ability and predictive performance. The Modified-Halsey and Modified-Oswin equations were the adequate models to describe the ERH data. Comparing results of this study with the previously published data, variety of sweet potato have the significant effect on the ERH properties. Sorption data obtained from literature, their adequate models for highly starchy products such as potato and cassava also be evaluated. The GAB model are not valid by checking the residual plots. The parameters of GAB model can not be modified for prediction of the effect of temperature by the exponential function. An empirical linear model RH=A+B/M+C×T/M was proposed to fit the ERH/EMC data of local sweet potato slices for its simplicity.