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  • 學位論文

稻米碾白度與表面脂肪酸及白度之關係探討

The Relationship between the Degree of Milling of Rice and Surface Lipid Content with Whiteness

指導教授 : 盧福明

摘要


本研究目的主要在探討稻米之碾白度與白度和脂質含量的關係,所使用之樣本為來自台中區農業改良場之98-2期台梗九號。稻穀之含水率約為13%,以農富牌小礱穀機(THM-1)將稻穀脫殼,所得到之糙米以McGill No.2精米機進行精米處理以取得8種不同碾白度之樣本,並以密保諾保鮮袋密封儲存於25℃。白度量測以Color Tester LFM1進行,表面脂肪酸含量以粟式萃取法(Soxhlet extraction)獲得,團粒樣本之紅外光吸收光譜以FOSS NIRS 6500掃描。碾白度對白度與脂質含量的決定係數分別為0.98和0.99。光譜的吸收度差異在波長1400nm以後較為明顯。以逐步回歸分析得到1436nm及806nm兩波長,其所組成預測方程式之決定係數為0.99。LED光源模擬預測選用epitex公司之L1450-66-60 以及PD1450-35T52感測器,預測電流對碾白度、白度與脂質含量之決定係數分別為0.97、0.96及0.96。

關鍵字

碾白度 白度 脂質含量 近紅外光

並列摘要


The objective of this research was to investigate the relationship between the degree of milling and surface lipid content of white rice. The sample was the 98-2 TK No.9 rice from Taichung District Agricultural Research and Extension Station. The rice sample with approximately 13% moisture was dehulled with a Long-Good dehuller(THM-1). The brown rice was milled with a laboratory no. 2 McGill mill to provide 8 different degree of milling of samples. The sample was put in Ziploc Storage Bags and stored at 25℃. The whiteness was measured by Color Tester LFM1, and surface lipid content was extracted through Soxhlet extraction. The near-infrared absorbance spectrum for whole kernel rice was obtained from FOSS NIRS 6500. The coefficients of determination (R2) of regression of degree of milling were 0.98 and 0.99 for whiteness and surface lipid content respectively. The difference of absorbance for different samples was more clear after 1400nm. The wavelength selected by step-wise regression were 1436nm and 806nm, and the determination (R2) of regression for prediction equation is 0.99. In the simulation study, LED light source L1450-66-60 was chosen from epitex, and the sensor was PD1450-35T52. The coefficients of determination (R2) of regression of prediction current were 0.97、0.96 and 0.96 for degree of milling、whiteness and surface lipid content respectively that suggested the feasibility to develop a whiteness measurement instrument using NIR LED as the light source.

參考文獻


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