Comparative quantification of chlorophyll and polyphenol levels in grapevine leaves sampled from different geographical locations.

ABSTRACT: Near infrared spectroscopy (NIRS) and mid-infrared spectroscopy (MIRS) in combination with chemometric analysis were applied to discriminate the geographical origin of grapevine leaves belonging to the variety "Touriga Nacional" during different vegetative stages. Leaves were collected from plants of two different wine regions in Portugal (Dão and Douro) over the grapes maturation period. A sampling plan was designed in order to obtain the most variability within the vineyards taking into account variables such as: solar exposition, land inclination, altitude and soil properties, essentially. Principal component analysis (PCA) was used to extract relevant information from the spectral data and presented visible cluster trends. Results, both with NIRS and MIRS, demonstrate that it is possib

SUBMITTER: Martin-Tornero E 

PROVIDER: S-EPMC7148322 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature