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Forecast of Apple Internal Quality Indices at Harvest and During Storage by VIS-NIR Spectroscopy

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Abstract

Harvest date is generally established by monitoring small batches of fruit prior to harvest for changes in maturity parameters such as firmness, starch index, and total soluble solid content using destructive methods. Substituting this method with nondestructive visible-near infrared (VIS-NIR) spectrophotometers could save manpower hours and improve accuracy for harvesting for prolonged storage. Six hundred apples (Malusdomestica Borkh.) from three different orchards for each of three cultivars, “Granny Smith,” “Pink Lady,” and “Starking” were used to build calibration and validation models in different spectral regions. Two instruments, VIS-NIR (340–1,014 nm) and short-wavelength near-infrared (SWIR) (850–1,888 nm) spectrophotometers, measured the apples at harvest both in a static position and on a moving cell conveyer, and these measurements were used to predict total soluble solid (TSS) content, titratable acidity (TA), and firmness at harvest and after 2, 4, and 6 months of 0 °C storage. Starch was also predicted at harvest. The best R 2 values were for TSS and starch (0.86 to 0.91) while TA and firmness predictions were less precise (0.53 to 0.78). The findings of the study indicate that the method offers potential for nondestructive prediction of ripeness and quality parameters of different cultivars of apples originating from different orchards. Moreover, the method enables forecasting of apple internal composition changes during storage based on the spectral signature at the time of harvest. Application of the results of this study could serve as a basis for the development of an automatic system for forecasting of apple internal composition change and of a sorting system.

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Acknowledgments

This is publication 745/13 from the Agricultural Research Organization, Volcani Center. We thank the packing house Perot Golan for supplying the apples.

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Authors and Affiliations

  1. Institute of Agricultural Engineering, Volcani Center, Agricultural Research Organization, P.O. Box 6, 50250, Bet Dagan, Israel

    Timea Ignat, Viacheslav Ostrovsky, Haim Egozi, Aharon Hoffman & Ze’ev Schmilovitch

  2. Department of Postharvest Science, Volcani Center, Agricultural Research Organization, 50250, Bet Dagan, Israel

    Susan Lurie, Juliana Nyasordzi, Haya Friedman & Asya Weksler

Authors
  1. Timea Ignat
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  2. Susan Lurie
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  3. Juliana Nyasordzi
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  4. Viacheslav Ostrovsky
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  5. Haim Egozi
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  6. Aharon Hoffman
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  7. Haya Friedman
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  8. Asya Weksler
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  9. Ze’ev Schmilovitch
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Correspondence to Ze’ev Schmilovitch.

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Ignat, T., Lurie, S., Nyasordzi, J. et al. Forecast of Apple Internal Quality Indices at Harvest and During Storage by VIS-NIR Spectroscopy. Food Bioprocess Technol 7, 2951–2961 (2014). https://doi.org/10.1007/s11947-014-1297-7

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  • DOI: https://doi.org/10.1007/s11947-014-1297-7

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