{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T21:36:40Z","timestamp":1769549800527,"version":"3.49.0"},"reference-count":35,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2011,6,7]],"date-time":"2011-06-07T00:00:00Z","timestamp":1307404800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>NIR spectroscopy was used as a non-destructive technique for the assessment of chemical changes in the main internal quality properties of wine grapes (Vitis vinifera L.) during on-vine ripening and at harvest. A total of 363 samples from 25 white and red grape varieties were used to construct quality-prediction models based on reference data and on NIR spectral data obtained using a commercially-available diode-array spectrophotometer (380\u20131,700 nm). The feasibility of testing bunches of intact grapes was investigated and compared with the more traditional must-based method. Two regression approaches (MPLS and LOCAL algorithms) were tested for the quantification of changes in soluble solid content (SSC), reducing sugar content, pH-value, titratable acidity, tartaric acid, malic acid and potassium content. Cross-validation results indicated that NIRS technology provided excellent precision for sugar-related parameters (r2 = 0.94 for SSC and reducing sugar content) and good precision for acidity-related parameters (r2 ranging between 0.73 and 0.87) for the bunch-analysis mode assayed using MPLS regression. At validation level, comparison of LOCAL and MPLS algorithms showed that the non-linear strategy improved the predictive capacity of the models for all study parameters, with particularly good results for acidity-related parameters and potassium content.<\/jats:p>","DOI":"10.3390\/s110606109","type":"journal-article","created":{"date-parts":[[2011,6,7]],"date-time":"2011-06-07T11:47:49Z","timestamp":1307447269000},"page":"6109-6124","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Optimization of NIR Spectral Data Management for Quality Control of Grape Bunches during On-Vine Ripening"],"prefix":"10.3390","volume":"11","author":[{"given":"Virginia","family":"Gonz\u00e1lez-Caballero","sequence":"first","affiliation":[{"name":"Centro de Investigaci\u00f3n y Formaci\u00f3n Agraria de \u2018\u2018Cabra-Priego\u201d, Instituto de Investigaci\u00f3n y Formaci\u00f3n Agraria y Pesquera (IFAPA), Consejer\u00eda de Agricultura y Pesca, Junta de Andaluc\u00eda, Cabra, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dolores","family":"P\u00e9rez-Mar\u00edn","sequence":"additional","affiliation":[{"name":"Department of Animal Production, University of Cordoba, Campus Rabanales, 14071 Cordoba, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda-Isabel","family":"L\u00f3pez","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n y Formaci\u00f3n Agraria de \u2018\u2018Cabra-Priego\u201d, Instituto de Investigaci\u00f3n y Formaci\u00f3n Agraria y Pesquera (IFAPA), Consejer\u00eda de Agricultura y Pesca, Junta de Andaluc\u00eda, Cabra, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda-Teresa","family":"S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Department of Bromatology and Food Technology, University of Cordoba, Campus Rabanales, 14071 Cordoba, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2011,6,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"676118","DOI":"10.1117\/12.735547","article-title":"In-Field Spectrophotometric Measurement to Estimate Maturity Stage of Wine Grapes","volume":"6761","author":"Menesatti","year":"2007","journal-title":"Proc. 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