Journal of Innovative Optical Health Sciences, Volume. 7, Issue 4, 1350034(2014)
Establishment of a comprehensive indicator to nondestructively analyze watermelon quality at different ripening stages
Two nondestructive methods based on visible and near-infrared (VIS-NIR) spectroscopy and X-ray image have been used for the evaluation of watermelon quality. The prediction performance based on partial least squares (PLS) by diffuse transmittance measurement (500–1010 nm) was evaluated for chemical quality attributes SSC (Rc = 0.903; RMSEC = 0.572% Brix; Rp = 0.862; RMSEP = 0.717% Brix; RPD = 1.83), lycopene (Rc = 0.845; RMSEC = 0.266 mg/ 100gFW; Rp = 0.751; RMSEP = 0.439 mg/100gFW; RPD = 1.13) and moisture (Rc = 0.917; RMSEC = 0.280%; Rp = 0.937; RMSEP = 0.276%; RPD = 2.79). The X-ray calibration linear equations developed by extracting the appropriate gray threshold were sufficiently precise for volume (R2 = 0.986) and weight (R2 = 0.993). In order to optimize prediction model of watermelon quality in growth period, multivariate multi-block technique factor analysis enabled integration of these traits: chemical information is related to physical information. Applying principle component analysis to extract common factors and varimax with Kaiser normalization to improve explanatory, the comprehensive indicator based on variances was established satisfactorily with Rc = 0.94, RMSEC = 0.244, Rp = 0.93, RMSEP = 0.344 and RPD = 2.00. A comparison of these models indicates that the comprehensive indicator determined only by portable VIS-NIR spectrometer appears as a suitable method for appraising watermelon quality nondestructively on the plant at different ripen stages. This method contributes to infer the picking date of watermelon with higher accuracy and bigger economic benefits than that by experience.
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Shuye Qi, Shuhui Song, Shengnan Jiang, Yingrui Chen, Wu Li, Donghai Han. Establishment of a comprehensive indicator to nondestructively analyze watermelon quality at different ripening stages[J]. Journal of Innovative Optical Health Sciences, 2014, 7(4): 1350034
Received: Jul. 10, 2013
Accepted: Aug. 3, 2013
Published Online: Jan. 10, 2019
The Author Email: Qi Shuye (qsy_ok@126.com)