Assessment of internal quality attributes of mandarin fruit. 1. NIR calibration model development
J. A. Guthrie A B C , K. B. Walsh B , D. J. Reid A and C. J. Liebenberg BA Delivery, Queensland Department of Primary Industries and Fisheries, PO Box 6014, CQ Mail Centre, Rockhampton, Qld 4702, Australia.
B Plant Sciences Group, Central Queensland University, Rockhampton, Qld 4702, Australia.
C Corresponding author. Email: john.guthrie@dpi.qld.gov.au
Australian Journal of Agricultural Research 56(4) 405-416 https://doi.org/10.1071/AR04257
Submitted: 3 November 2004 Accepted: 23 February 2005 Published: 26 April 2005
Abstract
The utility of near infrared spectroscopy as a non-invasive technique for the assessment of internal eating quality parameters of mandarin fruit (Citrus reticulata cv. Imperial) was assessed. The calibration procedure for the attributes of TSS (total soluble solids) and DM (dry matter) was optimised with respect to a reference sampling technique, scan averaging, spectral window, data pre-treatment (in terms of derivative treatment and scatter correction routine) and regression procedure. The recommended procedure involved sampling of an equatorial position on the fruit with 1 scan per spectrum, and modified partial least squares model development on a 720–950-nm window, pre-treated as first derivative absorbance data (gap size of 4 data points) with standard normal variance and detrend scatter correction. Calibration model performance for the attributes of TSS and DM content was encouraging (typical Rc2 of >0.75 and 0.90, respectively; typical root mean squared standard error of calibration of <0.4 and 0.6%, respectively), whereas that for juiciness and total acidity was unacceptable. The robustness of the TSS and DM calibrations across new populations of fruit is documented in a companion study.
Additional keywords: spectral window, non-invasive.
Acknowledgments
Funding support was received from Horticulture Australia (Citrus Marketing and Development Group) and Central Queensland University-Research Training Scheme. Fruit was supplied by Steve Benham of Joey Citrus, Munduberra, and by Jim and Deslea Yeldham, Citrus Farm, Dululu, Qld. This manuscript represents an extension of work reported at the 10th International Conference of Near Infrared Spectroscopy, Konju, Korea, June 2001.
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