Nondestructive Monitoring of Ripeness in Mango Cultivars by Acoustic Resonance Spectroscopy

Abstract

Mango cultivars, i.e. Neelam, Alphonso, Banganapalli, Totapuri, and Mallige were subjected to acoustic resonance spectroscopy at unripe, semi-ripe, and ripe stages, as well as in case of ripe bruised fruits. The Neelam variety of mango was screened for internal infestation by means of acoustic spectroscopy. Acoustic data on dominant and first frequencies, damping ratio, and firmness indices were obtained and correlated with mechanical penetration tests as well as a/b values of the tristimulus color profile. The correlations between mechanical tests and acoustic parameters varied from 0.81 to 0.933. However, damping ratio and dominant frequency along with firmness index showed a better correlation with penetration test vis-à-vis first frequencies. The correlations between acoustic parameters and a/b tristimulus color values showed lesser extent and significance of correlations ranging from 0.416 to 0.667. The correlations were found to be positive or negative depending on the specific acoustic parameters. However, in the case of internally infested Neelam, the drop in the first frequency was found to be a significant acoustic indicator. Nondestructive quality monitoring by acoustic spectroscopy was found as such to be consistent as far as the tissue softening and bruising are concerned.

Effect of Cultivar and Ripening Stage on Quality and Microstructure of Frozen Mangoes (Mangifera indicaLinn.)

“…Similar results were found in different mango cultivars during fruit ripening. [23] Chok Anan had a significantly higher firmness value than Nam Dok Mai at all ripening stages except the ripe stage (P ≤ 0.05). In addition, Jarimopas and Kitthawee [24] also found that the Chok Anan cultivar was firmer than the Nam Dok Mai throughout the development period.…”

Classification of Selected Citrus Fruits Based on Color Using Machine Vision System

“…Raju et al [6] have conducted studies on nondestructive monitoring of ripeness in different varieties of mangoes by acoustic resonance spectroscopy for online sorting of fruits. According to Vivek Venkatesh et al, [7] the maturity of fruits for a particular fruit variety can be estimated based on mass and volume, as they are indirectly correlated to the density of the fruits.…”

Combination of visible reflectance and acoustic response to improve non‐destructive assessment of maturity and indirect prediction of internal quality of red‐fleshed pomelo

“…Raju et al . (2006) reported a good correlation (correlation coefficients from 0.81 to 0.93) between the mechanical properties of mango fruit from five cultivars at four stages of ripeness and acoustic parameters. In citrus fruit, the acoustic impulse response was found be a good indication of firmness change (Wang et al ., 2006).…”