Qualitative and Quantitative Evaluation of Pomelo Maturity Using Multivariate Combination of Chemical and Physical Properties

Abstract

The present study reports the use of multivariate data analysis in combining physical and chemical properties for qualitative and quantitative evaluation of pomelo maturity. Pomelos of "Thong Dee" variety were harvested at four stages of maturity: immature, early mature, late mature and over-mature. The categories of maturity were classified with discriminant analyses on all variables and only nondestructive variables. The accuracy of classification using nondestructive variables (80.0%) was comparable to that using all variables (85.0%). For the estimation of the ratio of soluble solids content to acidity designated as a maturity measure, partial least squares regression models were developed based on either all remaining variables or nondestructive variables. The predictive performances by the two models were not significantly different. The acoustic response characterized by the third resonant frequency was shown to be the most important variable in qualitative and quantitative assessment of pomelo maturity. PRACTICAL APPLICATIONSThe results of the current study present a number of nondestructive parameters that are associated with pomelo maturity. They can be used to develop an on-line grading machine for pomelos.

Evaluation of pomelo maturity based on acoustic response and peel properties

“…The stiffness coefficients based on three frequencies showed an overall decreasing trend which was in agreement with previous work (Terdwongworakul et al ., ). However, in the previous work, which employed a different variety of pomelo, the decrease was more consistent than in this work.…”

“…The fruit response to an acoustic impulse carries information related to the firmness of the whole fruit. The acoustic impulse response of each fruit was conducted, and the impulse sound was recorded by a microphone installed diametrically opposite to the tapped point (Terdwongworakul et al, 2009). The sound signal was amplified through a sound card (Sigmatel 9750, 18-bit analog-to-digital, Austin, TX, USA) using a sampling rate of 32 000 samples per second for a period of 66.7 ms.…”

“…The mechanical properties of mango fruits from five cultivars at four stages of ripeness correlated well with acoustic parameters, obtaining correlation coefficients from 0.81 to 0.93. The acoustic response of pomelo harvested at four stages of maturity was found to be suitable for the estimation of the ratio of the soluble solids content to acidity with a correlation coefficient of 0.79 (Terdwongworakul et al, 2009).…”

Supporting young researchers in food texture studies

“…Since 2002, many research articles on texture of raw or minimum processed vegetables and fruits have been published in the JTS . New methods for precise evaluation of vegetables and fruits were proposed (Barikloo & Ahmadi, ; Boonmung, Chomtee, & Kanlayasiri, ; Camps, Guillermin, Mauget, & Bertrand, ; Dan et al, ; De Oliveira, Corrêa, Botelho, & De Oliveira, ; Desmet, Lammertyn, Verlinden, & Nicolaï, ; Kabas & Ozmerzi, ; Lana, Tijskens, De Theije, Dekker, & Barrett, ; Maury et al, ; Park, Chun, Lee, Lee, & Kim, ; Puangsombut, Pathaveerat, Terdwongworakul, & Puangsombut, ; Solomon & Jindal, ; Terdwongworakul, Puangsombat, & Pathaveerat, ; Trnka, Pavloušek, Medomoca, & Buchar, ; Valero et al, ; Vandenberghe & Claes, ; Vincent, Saunders, & Beyts, ). A specified part of vegetable and fruits, such as single cells from tomato pericarp (Wang, Pritchard, & Thomas, ), cell walls of carrot and potato (Zdunek & Umeda, ), carrot cell walls (Kurita & Masuda, ), epidermal tissue of onion (Hepworth & Bruce, ), and kiwi peelability (Harker, Hallett, White, & Seal, ) were also investigated.…”

Evaluation of Internal Quality of Fresh‐cut Pomelo Using Vis/Nir Transmittance

“…Pomelo (Citrus maxima Merr.) is a healthy fruit and an important export crop from Thailand in the form of both processed and fresh products (Terdwongworakul et al 2009). Fresh-cut pomelo is a Thai export product that generates high income.…”