Abstract:In order to determine rapidly and non-destructively the quality of pear fruit taking advantage of an non-destructive determination equipment, DA-Meter, quality indexes of different pear cultivars (Early-maturing: “Lvbaoshi”, “Zaosu”. Mid-maturing: “Xinli No.7”, “Huangguan”, “West green”, “Xueqing”. Late-maturing: “Yuluxiang”, “Hongxiangsu”, “Yali”, “Xuehua”) fruit and index of absorbance difference (IAD) of fruit surface based on DA-Meter were determined at different maturity stage, and correlation analysis was made between IAD value and different quality indexes. The results showed that there were linear correlations between IAD value and soluble solid content (SSC), soluble sugar, titratable acid (TA) and vitamin c (Vc) contents, as well as peel saturation C value, respectively, during fruit maturation in different cultivars of pears. Furthermore, IAD value had extremely significant linear correlations with firmness, seed browning rate and peel H value of color ratio at p<0.01 level. It indicated that IAD value could effectively response to the fruit quality and maturity. Thus, the DA-Meter could be used in the postharvest classification process under non-destructive determination in pear fruits.
