TY - JOUR
T1 - Integration of nondestructive techniques with destructive analyses to study postharvest water stress of winegrapes
AU - Bellincontro, Andrea
AU - Nicoletti, Isabella
AU - Valentini, Massimiliano
AU - Tomas, Alejandro
AU - De Santis, Diana
AU - Corradini, Danilo
AU - Mencarelli, Fabio
PY - 2009
Y1 - 2009
N2 - Red Cesanese grapes were harvested at 21 Brix. Berries were destemmed manually and placed in perforated plastic trays inside a small ventilated tunnel at 10°C with 1.5 m/sec of air flow, 10°C with 2.5 m/sec of air flow, and 20°C with 1.5 m/sec of airflow as a control. Relative humidity was 45%. The experiment was stopped at 20% berry weight loss, after 26, 22, and 16 days for 10°C at 1.5 m/sec, 10°C at 2.5 m/sec, and 20°C at 1.5 m/sec, respectively. Sugar content rose to 24-25 Brix. Carbon dioxide production from chilled berries under a higher air flow rate was constantly higher (-30%) than at a lower ventilation, and similar to that of the 20°C sample. Berries lost firmness (higher deformation), increased hue angle, and decreased chroma, regardless of treatment. Berries kept at a higher flow rate had magnetic resonance images similar to those of the berries kept at 20°C, with diffuse dark areas in the mesocarp. Analysis of alcohol dehydrogenase in the direction of the oxidation of ethanol to acetaldehyde revealed significantly higher activity at 20°C than at 10°C at 20% of weight loss, and ethanol was lower. The fluorescence (Fa) pattern confirmed a different stress rate depending on temperature and flow rate. Near-infrared-acousto-optic tunable filter (N1R-AOTF) analysis revealed a different absorbance level at a specific wavelength range depending on the treatment and the rate of weight loss. A significant decrease in polyphenols occurred in 10°C samples. Flavonols and stilbenes increased significantly at 20°C, confirming a supposed higher rate of water stress at 20°C.
AB - Red Cesanese grapes were harvested at 21 Brix. Berries were destemmed manually and placed in perforated plastic trays inside a small ventilated tunnel at 10°C with 1.5 m/sec of air flow, 10°C with 2.5 m/sec of air flow, and 20°C with 1.5 m/sec of airflow as a control. Relative humidity was 45%. The experiment was stopped at 20% berry weight loss, after 26, 22, and 16 days for 10°C at 1.5 m/sec, 10°C at 2.5 m/sec, and 20°C at 1.5 m/sec, respectively. Sugar content rose to 24-25 Brix. Carbon dioxide production from chilled berries under a higher air flow rate was constantly higher (-30%) than at a lower ventilation, and similar to that of the 20°C sample. Berries lost firmness (higher deformation), increased hue angle, and decreased chroma, regardless of treatment. Berries kept at a higher flow rate had magnetic resonance images similar to those of the berries kept at 20°C, with diffuse dark areas in the mesocarp. Analysis of alcohol dehydrogenase in the direction of the oxidation of ethanol to acetaldehyde revealed significantly higher activity at 20°C than at 10°C at 20% of weight loss, and ethanol was lower. The fluorescence (Fa) pattern confirmed a different stress rate depending on temperature and flow rate. Near-infrared-acousto-optic tunable filter (N1R-AOTF) analysis revealed a different absorbance level at a specific wavelength range depending on the treatment and the rate of weight loss. A significant decrease in polyphenols occurred in 10°C samples. Flavonols and stilbenes increased significantly at 20°C, confirming a supposed higher rate of water stress at 20°C.
KW - ADH
KW - Air flow
KW - Dehydration
KW - Grape
KW - MRI
KW - NIR
KW - Polyphenols
KW - Temperature
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M3 - Article
AN - SCOPUS:62949200894
SN - 0002-9254
VL - 60
SP - 57
EP - 65
JO - American Journal of Enology and Viticulture
JF - American Journal of Enology and Viticulture
IS - 1
ER -