Prediction models for assessing anthocyanins in grape berries by fluorescence sensors: Dependence on cultivar, site and growing season. (1st April 2018)

• Record Type: Journal Article
• Authors: Pinelli, Patrizia; Romani, Annalisa; Fierini, Elisa; Agati, Giovanni
• Is Part Of: Food chemistry. Volume 244(2018)
• Page Start: 213
• Page End: 223
• Publication Date: 2018-04-01
• Subjects: Mx multiplex -- Chl chlorophyll -- ANTHR log(1/Chl-fluorescence_R) -- ANTHRG log(Chl-fluorescence_R/Chl-fluorescence_G) -- R red light -- G green light -- Anths anthocyanins -- CdG Casale del Giglio -- CB Castello Banfi -- ME Merlot -- PV Petit Verdot -- SH Syrah -- CS Cabernet Sauvignon -- GDD growing degree-days -- RF red fluorescence -- FRF far red fluorescence -- LED light emitting diode -- HPLC high performance liquid chromatography -- RMSEC root mean square error of calibration -- RMSEP root mean square error of prediction -- RE relative error -- SD standard deviation -- Anthg anthocyanin concentration expressed per berry mass -- Anthm anthocyanin concentration expressed per berry skin mass -- CUBA converter of units of berry anthocyanins -- RSM relative skin mass -- DOY day of the year; Anthocyanins -- Fluorescence -- In-field applications -- Non-destructive measurements -- Optical sensors; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2017.10.021
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Fluorescence sensors were calibrated for in situ assessing grape anthocyanins. Anthocyanin prediction was rather independent of grape cultivar and growing site. ANTHRG index was less sensitive than ANTHR to the seasonal effect on the calibrations. Massive optical samplings differentiated plots even with high anthocyanin variability. Abstract: Fluorescence sensors are useful tools for the non-destructive assessment of grape berry anthocyanins. The Multiplex (Mx) sensor here studied provides two anthocyanin indices: ANTHR = log(1/Chl-fluorescence_R) and ANTHRG = log(Chl-fluorescence_R/Chl-fluorescence_G), based on the chlorophyll (Chl) fluorescence excited with red (R) and green (G) light. These indices were calibrated against wet chemistry. The dependence of anthocyanin prediction models on cultivar, season and site was studied on four cultivars in two Italian regions during three consecutive years. The 2010 global model (all cultivars at both growing sites) gave relative prediction errors on anthocyanin content less than 14.1% (ANTHR ) and 19.0% (ANTHRG ). The ANTHRG was independent of season, maintaining a relative error of about 20% in both 2011 and 2012. In field applications of the calibrated Mx, it showed its ability to detect inter-plot and inter-season differences on both growing sites.