Estimation of Changes in Mechanical and Color Properties from the Weight Loss Data of “Shine Muscat” Fruit during Storage

Takashi Watanabe,Takeo Shiina,Nobuyoshi Ota,Nobutaka Nakamura

doi:10.1155/2018/7258029

Takashi Watanabe, Takeo Shiina + Show 2 more

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https://doi.org/10.1155/2018/7258029

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Abstract

“Shine Muscat” fruit is a table grape commonly consumed cultivar in Japan; however, the storage characteristics have not been investigated, especially physical properties. The objective of this study was to clarify changes in weight loss, mechanical, and color properties of Shine Muscat fruit during storage and the relationships between them. The storage tests were performed at 15°C under two relative humidity (RH) conditions, i.e., RH 95% and RH 40%. The weight loss of fruit was calculated from the mass changes during storage. The mechanical properties—stress, strain, and elasticity—at the break point were examined by compression tests. The color properties, color differences (ΔE), and chroma (C) were calculated from L∗a∗b∗ scale parameters. The breaking stress did not reflect changes in the mechanical characteristics of samples during storage. Weight loss was highly correlated with the breaking strain and elasticity, ΔE, and C. In addition, the physical properties could be estimated from weight loss data (R2 = 0.81–0.94). We showed the changes in weight loss and other physical properties and proposed equations to estimate the physical properties based on weight loss data. The equations indicated the importance of inhibiting the weight loss to maintain the quality and could be used as a nondestructive and easy method for assessment of storage characteristics of Shine Muscat fruit.

Highlights

“Shine Muscat” fruit is a table grape derived from Vitis labruscana Bailey and Vitis vinifera L. is a commonly consumed cultivar in Japan with increasing demand [1, 2]
We developed equations to estimate the changes in these physical properties from the weight loss data collected during storage. ese results contributed as an assessment data of storage characteristics of the fruit; an easy estimating method for mechanical and color properties was proposed
Shine Muscat bunches were purchased from a fruit sorting center in Yamanashi Prefecture, Japan. e bunches were immediately transported to the Food Research Institute NARO, Ibaraki, Japan. e bunches were subjected to storage tests, and when the physical property tests were performed, each individual fruit was used as a sample (Brix value: 18.75 ± 1.01 °Brix, pH value: 3.69 ± 0.16, diameter: 28.07 ± 2.08 mm, weight: 17.38 ± 2.11 g)

Summary

Introduction

“Shine Muscat” fruit is a table grape derived from Vitis labruscana Bailey and Vitis vinifera L. is a commonly consumed cultivar in Japan with increasing demand [1, 2]. The changes in mechanical properties of Shine Muscat fruit during storage have not been investigated. Because skin color is important for consumer acceptability of table grapes, the color characteristics of several grape cultivars were investigated [6]. E objective of this study was to identify the changes in mechanical and color properties of Shine Muscat fruit during storage. Based on these data, we developed equations to estimate the changes in these physical properties from the weight loss data collected during storage. Ese results contributed as an assessment data of storage characteristics of the fruit; an easy estimating method for mechanical and color properties was proposed We developed equations to estimate the changes in these physical properties from the weight loss data collected during storage. ese results contributed as an assessment data of storage characteristics of the fruit; an easy estimating method for mechanical and color properties was proposed

Methods

Results

Conclusion