Abstract
The criteria for estimating optimal maturity in red grapes are complex. The ratio sugars/acids do not give enough information to determine precisely the date of harvesting. The accumulation of phenolic compounds depends on climate, soil, genetics and cultural practices. Grape phenolics , which are structurally diverse, therefore have a variable extraction potential (called extractability). This chapter discusses the methods for determining phenolic maturity based on anthocyanin extraction from the whole berries. First, the description and modifications done by different authors are explained. Second, the interpretation of values and indexes is exposed. Finally, the effects of environmental and genetic factors on phenolic content of grapes and the colour extractability are commented.
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Abbreviations
- AOC:
-
Wine county region, (Appellation d’Origine Controlée)
- DAD:
-
Diode Array Detection
- DMACH:
-
p-dimethylaminocinnamaldehyde
- HPLC:
-
High Performance Liquid Chromatography
- HPLC-MS:
-
Liquid Chromathography coupled to Mass Spectrometry
- IPT:
-
Absorbance at 280 nm, Total Phenol Index
- NIR:
-
Near Infrared
- MS:
-
Mass Spectrometry
- PAL:
-
Phenylalanine Ammonia Lyase
- PAR:
-
Photosynthetic Active Radiation
- UV-Vis:
-
Ultraviolet Visible
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Acknowledgments
The author acknowledges the partial financial support of Spanish Ministry of Science and Education through the projects AGL2005-06927-CO2-02 and AGL2008-04525-CO2-02 and to the CDTI project with UNIÓ Cooperatives Company in Tarragona, Spain. We thank the scientific collaboration of Felicidad de Herralde and Josep Valls. We thank the collaboration of Miriam Lampreave and Sumpta Mateos for laboratory work.
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Nadal, M. (2010). Phenolic Maturity in Red Grapes. In: Delrot, S., Medrano, H., Or, E., Bavaresco, L., Grando, S. (eds) Methodologies and Results in Grapevine Research. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9283-0_28
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