Citation
Ortiz Sánchez, Mª Coral and Barreiro Elorza, Pilar and Correa Hernando, Eva Cristina and Riquelme Ballesteros, F. and Ruiz-Altisent, Margarita
(2001).
Non destructive identification of wolly peache using impact response near infrared spectroscopy.
"Journal of Agricultural Engineering Research", v. 78
(n. 3);
pp. 281-289.
ISSN 0021-8634.
https://doi.org/10.1006/jaer.2000.0570.
Abstract
A procedure which combines impact response and near-infrared sensing in a two-step classification method has been developed for identification of woolly peaches. Two hundred and seventy Maycrest peaches from three ripeness stages at harvest, stored during 0, 1, 2, 3 and 4 weeks at 1 and 5°C, were tested by non-destructive techniques (non-destructive impact and near-infrared spectroscopy) in order to assess woolliness (also known as mealiness in apples). Destructive mechanical tests (Magness–Taylor, confined compression and shear rupture) were used as a reference method to identify woolly fruits. Non-destructive impact data were processed by discriminant analysis to segregate into two texture categories (crispy–firm–hard and non-crispy–non-firm–soft). In the same way, discriminant analysis techniques were used to classify into three juicy categories (low juicy, medium juicy and high juicy), according to the near-infrared second derivative curve. Combining non-destructive impact and near-infrared spectroscopy, not crispy, not firm and soft fruit from the low juicy group were classified as woolly. The percentage of correctly classified fruits in both categories was 80%. The conditions about the experimental factors which enhance woolliness obtained from the destructive procedures were confirmed by the non-destructive procedure.