per i cultori del tè, e per chi vuole mantenere una pelle giovane ed elastica, un interessante studio che mostrerebbe la superiorità del tè bianco.
http://www.biomedcentral.com/1472-6882/9/27/abstract
Anti-collagenase, anti-elastase and anti-oxidant activities of
extracts from 21 plants
Tamsyn SA Thring , Pauline Hili and Declan P Naughton
BMC Complementary and Alternative Medicine 2009, 9:27doi:10.1186/1472-
6882-9-27
Published: 4 August 2009
Abstract (provisional)
Background
Owing to their roles in tissue remodelling in health and disease,
several studies have reported investigations on plant extracts as
inhibitors of proteinases and as anti-oxidants.
Methods
The anti-ageing and anti-oxidant properties of 23 plant extracts (from
21 plant species) were assessed as anti-elastase and anti-collagenase
activities and in selected anti-oxidant assays along with phenolic
content.
Results
Anti-elastase activities were observed for nine of the extracts with
inhibitory activity in the following order: white tea (~89%), cleavers
(~58%), burdock root (~51%), bladderwrack (~50%), anise and angelica
(~32%). Anti-collagenase activities were exhibited by sixteen plants
of which the highest activity was seen in white tea (~87%), green tea
(~47%), rose tincture (~41%), and lavender (~31%). Nine plant extracts
had activities against both elastase (E) and collagenase (C) and were
ranked in the order of white tea (E:89%, C:87%) > bladderwrack (E:50%,
C:25%) > cleavers (E:58%, C:7%) > rose tincture (E:22%, C:41%) > green
tea (E:10%: C:47%) > rose aqueous (E: 24%, C:26%) > angelica (E:32%,
C:17%) > anise (E:32%, C:6%) > pomegranate (E:15%, C:11%). Total
phenolic content varied between 0.5 and 0.26 mg gallic acid
equivalents (GAE)/mL with the exception of white tea (0.77 mg GAE/mL).
For anti-oxidant assessment, the Trolox equivalent anti-oxidant
capacity (TEAC) assay revealed activity for all extracts. White tea
had the highest activity equivalent to ~21 microM Trolox for a 6.25
microg aliquot. In addition, seven extracts exhibited activities
[greater than or equal to] 10 microM Trolox with witch hazel (6.25
microg = 13 microM Trolox) and rose aqueous (6.25 microg = 10 microM
Trolox) showing very high activities at low concentrations. A high
activity for white tea was also found in the superoxide dismutase
(SOD) assay in which it exhibited ~88% inhibition of reduction of
nitroblue tetrazolium. High a
http://www.biomedcentral.com/1472-6882/9/27/abstract
Anti-collagenase, anti-elastase and anti-oxidant activities of
extracts from 21 plants
Tamsyn SA Thring , Pauline Hili and Declan P Naughton
BMC Complementary and Alternative Medicine 2009, 9:27doi:10.1186/1472-
6882-9-27
Published: 4 August 2009
Abstract (provisional)
Background
Owing to their roles in tissue remodelling in health and disease,
several studies have reported investigations on plant extracts as
inhibitors of proteinases and as anti-oxidants.
Methods
The anti-ageing and anti-oxidant properties of 23 plant extracts (from
21 plant species) were assessed as anti-elastase and anti-collagenase
activities and in selected anti-oxidant assays along with phenolic
content.
Results
Anti-elastase activities were observed for nine of the extracts with
inhibitory activity in the following order: white tea (~89%), cleavers
(~58%), burdock root (~51%), bladderwrack (~50%), anise and angelica
(~32%). Anti-collagenase activities were exhibited by sixteen plants
of which the highest activity was seen in white tea (~87%), green tea
(~47%), rose tincture (~41%), and lavender (~31%). Nine plant extracts
had activities against both elastase (E) and collagenase (C) and were
ranked in the order of white tea (E:89%, C:87%) > bladderwrack (E:50%,
C:25%) > cleavers (E:58%, C:7%) > rose tincture (E:22%, C:41%) > green
tea (E:10%: C:47%) > rose aqueous (E: 24%, C:26%) > angelica (E:32%,
C:17%) > anise (E:32%, C:6%) > pomegranate (E:15%, C:11%). Total
phenolic content varied between 0.5 and 0.26 mg gallic acid
equivalents (GAE)/mL with the exception of white tea (0.77 mg GAE/mL).
For anti-oxidant assessment, the Trolox equivalent anti-oxidant
capacity (TEAC) assay revealed activity for all extracts. White tea
had the highest activity equivalent to ~21 microM Trolox for a 6.25
microg aliquot. In addition, seven extracts exhibited activities
[greater than or equal to] 10 microM Trolox with witch hazel (6.25
microg = 13 microM Trolox) and rose aqueous (6.25 microg = 10 microM
Trolox) showing very high activities at low concentrations. A high
activity for white tea was also found in the superoxide dismutase
(SOD) assay in which it exhibited ~88% inhibition of reduction of
nitroblue tetrazolium. High a