利用近紅外線光譜儀檢測甘藷台農57號烤藷品質之研究

Measuring Baking Quality of Root Tubers of Sweet Potato (Ipomoea Batatas) Variety TNG 57 by Near Infrared Reflectance

利幸貞(Hsin-Chen Li) ； 廖大經(Dah-Jing Liao)

《台灣農業研究》 60卷3期 (2011/09) Pp. 178-184

https://doi.org/10.6156/JTAR/2011.06003.03

摘要

本試驗利用近紅外線光譜儀（InfraAlyzer 450），對甘藷台農57號烤藷之澱粉與可溶性糖含量之傳統分析值，以不同波長吸光值（λ）之換算值log（1／λ）進行逐步回歸模式估算成分含量，檢量線選用3至7個波長數組合。甜味值是烤藷品質重要指標，結果顯示鮮藷重量小於100 g及大於300 g之烤藷，利用近紅外線光譜儀檢測僅澱粉含量之檢量線具較佳的相關係數值，但在可溶性糖含量檢測上有困難。塊根鮮重100－200 g之烤藷於澱粉、可溶性糖含量之檢量線有較佳的相關係數值，鮮重201－300 g之烤藷於可溶性糖含量之檢量線有較佳的相關係數值，因此，塊根重量會影響近紅外線光譜儀對台農57號烤藷甜味品質檢測的應用性。樣品前處理的均質度亦影響照射光的擴散與反射；藷泥因其殘存的澱粉糊化顆粒影響，樣品前處理之均勻程度較差，對吸光情況影響大。近紅外線分析技術雖然快速、省工、操作簡易，但其對精確度與準確性要求嚴格，藉由選擇檢測光譜之波長範圍、改善樣品前處理之均質度與塊根重量分級，應可提高近紅外線光譜分析台農57號烤藷甜味品質檢測之應用。

關鍵字

甘藷台農57號 ； 烤藷 ； 近紅外線光譜儀 ； 甜味值

並列摘要

Sweetness is considered an important indicator of baking quality of sweet potato (Ipomoea batatas). The objective of this study was to determine sweetness of baked root tubers of sweet potato, variety TNG 57, using Near Infrared Reflectance Spectrometer (NIRS; InfraAlyzer 450). The sweetness of baked root tubers was estimated by stepwise regression analyses using the data of starch and soluble sugar contents obtained from conventional analysis and the conversion values log (1/λ) of the absorbance at different wavelengths (3-7 sets) obtained from NIRS. Results showed that the fresh weight of root tubers between 100-300 g had a better correlation coefficient with their calibration curve for soluble sugar contents, whereas the fresh weight of tubers below 100 g or above 300 g had a better correlation coefficient only for the content of starch. Starch particles remaining in the baked root tubers affected the diffusion and reflection of NIRS. The NIRS is easy to operate, low labor input and low cost, but it demands high precision and high accuracy in the tests of baked root tubers of sweet potato. Therefore, choosing correct wavelengths and baked root tubers size for testing are important in the application of NIRS for testing quality of baked root tubers of sweet potato variety TNG 57.

並列關鍵字

Sweet potato ； Ipomoea batatas ； Baked root tubers ； Near Infrared Reflectance Spectrometer (NIRS) ； Sweetness