New portable optical sensors for the assessment of winegrape phenolic maturity based on berry fluorescence
نویسندگان
چکیده
Grape phenolic maturity is usually analysed by destructive wet chemistry in the laboratory. Yet, for precision agriculture more rapid and nondestructive methods are needed. Therefore, in addition to measurements of fruit colour, a new optical method was recently proposed. It is based on the screening of fruit chlorophyll fluorescence that allows both flavonol and anthocyanin contents of intact berry skin to be assessed. Here we present preliminary results obtained with two commercial devices, Dualex FLAVTM and Dualex ANTHTM, and a prototype, Multiplex, all based on this new method. We found that Multiplex has strong potential for an application in the vineyard for precision viticulture or for crop evaluation at the weighbridge.
منابع مشابه
Assessment of anthocyanins in grape (Vitis vinifera L.) berries using a noninvasive chlorophyll fluorescence method.
Anthocyanins (Anths) in grape (Vitis vinifera L.) berries harvested at véraison from Pinot Noir and Pinot Meunier cultivars were assessed nondestructively by measuring chlorophyll fluorescence (ChlF) excitation spectra. With increasing Anth content, less excitation light was transmitted to the deeper Chl layers, and thus the ChlF signal decreased proportionally. By applying Beer-Lambert's law, ...
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