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Non-invasive techniques for measurement of fresh fruit firmness

journal contribution
posted on 06.12.2017, 00:00 authored by Phul SubediPhul Subedi, Kerry WalshKerry Walsh
A sound velocity technique and visible–short wave near infrared (400–1100 nm) interactance spectroscopy were considered in the context of the assessment of fruit firmness in intact banana, mango and peach fruit. The velocity of a vibration (‘sound’) wave moving through the fruit decreased during ripening of mango (from 84 to 39ms−1), banana (29 to 14) and peach (28 to 15) fruit. Fruit firmness assessed using a penetrometer (Fpen) was linearly correlated (R2 > 0.8) with sound velocity in mango, but not peach or banana. Spectra were related to the penetrometer and sound velocity readings using partial least squares regression. A cross-validation result of R2 = 0.92, 0.86 and 0.79 for the penetrometer reading and R2 = 0.88, 0.77 and 0.58 for the sound velocity reading was achieved for banana, mango and peach fruit,respectively. However, these results are likely to be a peel-related attribute for banana, potentially a skin pigment, as the optical geometry used would primarily optically sample the peel, rather than pulp tissue. Prediction results, involving independent data sets, were very poor (R2 < 0.75) for both the penetrometerand sound velocity readings in all three commodities, with the marginal exception of that for the penetrometer reading for banana (R2 = 0.76). The visible–short wave near infrared interactance spectroscopy technique is therefore not recommended for assessment of fruit firmness. The sound velocity technique is recommended for measurement of an index descriptive of the stage of ripening of mango, banana and peach fruit, although it does not assess the same character as a penetrometer reading.Crown Copyright © 2008 Published by Elsevier B.V. All rights reserved.

Funding

Category 3 - Industry and Other Research Income

History

Volume

51

Start Page

297

End Page

304

Number of Pages

8

eISSN

1873-2356

ISSN

0925-5214

Location

Netherlands

Publisher

Elsevier

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Plant and Water Science; Institute for Resource Industries and Sustainability (IRIS);

Era Eligible

Yes

Journal

Postharvest biology and technology.