TY - JOUR 
A1 - Olego, M. A.
AU - Álvarez, J. C.
AU - Tobes, A.
AU - De-Paz, José M.
AU - Coque, J. J. R.
AU - Garzón-Gimeno, Enrique
T1 - Determining optimum harvest time under Mediterranean conditions: developing a new model for measuring L-malic acid concentration in red grapes
Y1 - 2016
SN - 1755-0238
UR - http://hdl.handle.net/20.500.11939/6790
AB - Background and Aims: Malic acid concentration varies as berries develop, reaching its highest value just before veraison.
Objective criteria for choosing the optimal harvest time require chemical or physicochemical measurements; the determination of
malic acid concentration is one of these. The main aim of this work was to develop a predictive model to determine the malic acid
concentration in grapes at harvest time as an alternative to commonly used methods, such as HPLC and enzymatic analysis.
Methods and Results: The red grape cultivar Vitis vinifera L. Tempranillo was used in this study. Of the 11 predictive parameters
measured, titratable acidity (TA) had the greatest relative importance as a predictor variable for estimation of the concentration of
malic acid in must at harvest time.
Conclusions: The daily average rainfall from harvest time to the next season sampling time, pH and TA and TA raised to the second
power have been shown to be significant contributors in predicting malic acid concentration in grapes at harvest time.
Significance of the Study: This work describes a multiple regression model that explains malic acid concentration in red grapes
at harvest time.
KW - Akaike Information Criteria
KW - Cross-validation
KW - Multiple regression model
KW - Titratable acidity
KW - F01  Crop husbandry
KW - F60  Plant physiology and biochemistry
KW - Malic acid
LA - en
PB - Wiley Online Library
ER -