Journal
POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 94, Issue -, Pages 89-96Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.postharvbio.2014.03.007
Keywords
Optical properties; Inverse adding-doubling; Royal Gala; Acoustic firmness; Penetrometer firmness
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Funding
- New Zealand Foundation of Research, Science and Technology [C06X0808]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [C06X0808] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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Absorption and reduced scattering coefficients were measured between 400 and 1050 nm for 'Royal Gala' apples using the inverse adding-doubling technique. Relationships between penetrometer, acoustic firmness and the optical properties are identified. Carotenoid (400-500 nm), and to a lesser extent chlorophyll-a (680 nm), absorptions were found to correlate with penetrometer firmness, with correlation coefficients equal to -0.69 and 0.52 respectively. The reduced scattering coefficient across all wavelengths increased as fruit softened. An average correlation coefficient of -0.68 was found between the reduced scattering coefficient (550-900 nm) and penetrometer firmness. No correlation was found between the AWETA acoustic firmness and either of the optical properties. A correction was developed to improve the correlation between penetrometer firmness and carotenoid absorption. This compensated for errors introduced by light loss in the inverse adding-doubling system and improved the correlation from -0.68 to -0.78. (c) 2014 Elsevier B.V. All rights reserved.
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