Delayed light emission as a means of quality evaluation of fruits and vegetables

摘要: DLE is probably produced by all fruits, vegetables, and plant materials undergoing photosynthesis. However, the intensity duration of emitted light vary widely depending upon many factors. Because strong dependence on chlorophyll content, variation in can be expected among different varieties same product. Therefore, quality evaluation based measurements require careful selection measuring criteria such as illumination, dark period, temperature. It necessary to obtain precise values for a particular product under set condition; measurement conditions should carefully validated establish standard criteria. In general, fruits vegetables three major aspects: maturity and/or ripeness evaluation, composition analysis, internal external defect detection. so far have focused mainly because definite relationship between concentration, which changes with maturity. noted that alone not sufficient; it complex situ related compounds jointly contribute DLE. Composition sugar content has been Recently, applied detect certain physiological stress responses defects chilling injuries. these areas research yet fully explored. Further investigation relating compositional may offer solutions problems. The after excitation involves matter at least several seconds. From mechanical standpoint, this extended period emission offers convenient time separate measurement. exponential decay necessitates very control illumination broad activation spectrum permits wide choice simple design sources. size, shape, varietal variations make uniform difficult. suggested instruments designed over entire surface specimen. An average would reduce effect nature shape Reporting per unit area will eliminate DLE.(ABSTRACT TRUNCATED AT 400 WORDS)