水果内部品质近红外光谱无损检测研究进展

近红外(NIR)光谱分级技术正越来越广泛地应用于水果的产后加工和质量评判中.介绍了水果内部品质光学特性检测原理;分析了规则反射、透射和漫反射3种光特性测量方法在水果内部品质不同需求检测中的适用性;化学计量学方法是近红外光谱分析技术的一个重要部分,对一些新的预处理方法和回归算法作了介绍;探讨了水果状态对光谱影响及修正方法,如温度补偿、大小修正等;并阐述了水果的糖度、酸度、硬度等定量检测和褐变、黑心、水心、损伤等定性判别的国内外最新研究进展;分析了近红外技术在水果品质检测和控制方面的应用前景.

Review of Nondestructive Measurement of Fruit Quality by Means of Near Infrared Spectroscopy

An overview of near infrared(NIR) spectroscopy for use in measuring quality attributes of horticultural produce is given.Nondestructive quality inspection and sorting technique based on NIR technique is widely used in post-harvest processing and quality control.Different spectrophotometer designs and measurement principles are compared,and novel techniques for the estimation of light absorption and scattering properties of fruit tissue are reviewed.Chemometrics is an essential part of NIR spectroscopy,and some available preprocessing and regression techniques,including nonlinear ones,are discussed.The effects of orchard state on spectrum,and correction method,such as temperature compensation,are addressed.Most applications of NIR spectroscopy have focused on the nondestructive measurement of soluble solids content of fruit where typically a root mean square error of prediction of Brix can be achieved,and other applications involving texture,acidity or disorders of fruit have also been reported.Finally,the application prospects of this technology were analyzed.