User profiles for V. A. P. De Freitas
Victor de FreitasProfessor of Chemistry, University of Porto Verified email at fc.up.pt Cited by 21778 |
[HTML][HTML] A review of the current knowledge of red wine colour.
VAP de Freitas, A Fernandes, J Oliveira, N Teixeira… - Oeno One, 2017 - oeno-one.eu
Anthocyanins are the main compounds present in young red wines, being responsible for
their intense red colour. These pigments are mainly located in grape skins and their …
their intense red colour. These pigments are mainly located in grape skins and their …
Characterisation of oligomeric and polymeric procyanidins from grape seeds by liquid secondary ion mass spectrometry
VAP de Freitas, Y Glories, G Bourgeois, C Vitry - Phytochemistry, 1998 - Elsevier
Several fractions of oligomeric and polymeric procyanidins have been obtained from grape
seeds by gel chromatography on Fractogel TSK. Their molecular weights (Mw) were directly …
seeds by gel chromatography on Fractogel TSK. Their molecular weights (Mw) were directly …
Antioxidant protection of low density lipoprotein by procyanidins: structure/activity relationships
…, JAN Laranjinha, VAP de Freitas - Biochemical …, 2003 - Elsevier
The antioxidant activity of catechins and oligomeric procyanidins against low density
lipoproteins peroxidation was studied by means of three distinct methods: cis-parinaric acid …
lipoproteins peroxidation was studied by means of three distinct methods: cis-parinaric acid …
Developmental changes of procyanidins in grapes of red Vitis vinifera varieties and their composition in respective wines
VAP De Freitas, Y Glories… - American Journal of …, 2000 - Am Soc Enol Viticulture
Merlot and Cabernet Sauvignon grapes were sampled during the growing season until
harvest. The content of catechins ((+)-catechin, (-)-epicatechin and (-)-epicatechin gallate, …
harvest. The content of catechins ((+)-catechin, (-)-epicatechin and (-)-epicatechin gallate, …
Hydrolysis of epigallocatechin gallate using a tannase from Paecilomyces variotii
V Battestin, GA Macedo, VAP De Freitas - Food Chemistry, 2008 - Elsevier
Epigallocatechin (EGC) and gallic acid (GA) were prepared by the degalloylation of an
epigallocatechin gallate (EGCG) extract from green tea. EGCG was entirely hydrolyzed using a …
epigallocatechin gallate (EGCG) extract from green tea. EGCG was entirely hydrolyzed using a …
Influence of procyanidin structures on their ability to complex with oenin
B Berké, VAP de Freitas - Food chemistry, 2005 - Elsevier
Intermolecular copigmentation between malvidin-3-O-glucoside (oenin) and several
procyanidins of a homogeneous series in a wine model solution (pH 3.6, in hydroalcoholic (12%) …
procyanidins of a homogeneous series in a wine model solution (pH 3.6, in hydroalcoholic (12%) …
Incidence of molecular structure in oxidation of grape seed procyanidins
VAP de Freitas, Y Glories… - Journal of agricultural and …, 1998 - ACS Publications
The kinetics of decomposition of the following flavan-3-ol derivatives isolated from grape
seeds under oxidative conditions by airing and using metal ion catalysis (iron and copper) are …
seeds under oxidative conditions by airing and using metal ion catalysis (iron and copper) are …
Chemicals with sweet aroma descriptors found in Portuguese wines from the Douro region: 2, 6, 6-trimethylcyclohex-2-ene-1, 4-dione and diacetyl
…, Z Azevedo, A Macedo, VAP De Freitas - Journal of Agricultural …, 2001 - ACS Publications
2,6,6-Trimethylcyclohex-2-ene-1,4-dione (TMCHD), a norisoprenoid with a sweet honey
aroma descriptor, is reported for the first time as a minor constituent of single-varietal table and …
aroma descriptor, is reported for the first time as a minor constituent of single-varietal table and …
Identification of some volatile descriptors of the rock-rose-like aroma of fortified red wines from Douro demarcated region
VAP de Freitas, PS Ramalho, Z Azevedo… - Journal of agricultural …, 1999 - ACS Publications
2,2,6-Trimethylcyclohexanone and ethyl dihydrocinnamate, known sensorial descriptors of
rock-rose (Cistus ladaniferus) aroma, are reported as minor constituents of young fortified …
rock-rose (Cistus ladaniferus) aroma, are reported as minor constituents of young fortified …
Fortification spirit, a contributor to the aroma complexity of Port
FSS Rogerson, VAP De Freitas - Journal of food science, 2002 - Wiley Online Library
Five 1999 varietal Douro table wines (Touriga Nacional, Touriga Francesa, Tinta Roriz,
Tinto Căo, Tinta Amarela/Tinta Barroca mixed), one aguardente and five model Ports (…
Tinto Căo, Tinta Amarela/Tinta Barroca mixed), one aguardente and five model Ports (…