chapter5determinationofmoisture(參考版)
2024-10-28 17:59本頁面
【正文】 紅外水分測量儀 ? 一般的樣品的話，只要十幾分鐘就能完成測量。使用近紅外線水分分析儀時，必須預先制作標準曲線。Chapter 5. Determination of moisture Section 1. General ? Moisture determiantion is one of important and most widely used measurements in the processing and testing of foods. ? Dry matter ? Stability and quality of foods ? Chemical reactions 1. Water forms ? Free water ? Absorbed water ? Bound water 2. Methods of moisture determination ? Direct determinantion: remove the moisture in sample by the methods of drying, distillation and extration. ? Indirect detremiantion: using sample’s density, refraction, conductivity or capacitance to measure the moisture content. ? Direct determination: good accuracy and repetition, but spending long time. ? Indirect de
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