It was also observed that TAC of plasma affected by the presence
of lipophilic antioxidants (ORACL) increases in 2 h and
remained above baseline even at 4 h after meal (Fig. 4) [26]. It is
believed that the antioxidants in bilberries that are responsible
for the attainment of high antioxidant capacity of human blood
plasma are primarily a chlorogenic acid, with substantial contribution
of anthocyanins and proanthocyanidins [27]. Specific
antioxidant properties of blueberry probably are also a result
of high concentrations of total anthocyanins [24]. Antioxidants
from this group of polyphenols especially prevalent in fruits
of many species and varieties of blueberries are delphinidin,
occurring in form of galactosides and glucosides. They are given a
substantial share of TAC increase in plasma after consuming large
amounts of fruit. It is believed that a significant effect of blueberry
consumption compared with red grapes fruit on plasma TAC increase
may be due to the higher concentration of anthocyanin in
these fruits. Red grapes are characterized by the presence of large
amounts of resveratrol, a stilbene polyphenol derivative, a compound
that blueberries do not contain, and which in the opinion
of experts, shows a much weaker free-radical scavenging properties
of oxygen than anthocyanins. Research on the effects of
blueberry on organisms have shown that to effectively prevent
decline of TAC in the plasma of human blood, this fruit should be
eaten in larger doses of 100 to 200 g [18].
It was also observed that TAC of plasma affected by the presence
of lipophilic antioxidants (ORACL) increases in 2 h and
remained above baseline even at 4 h after meal (Fig. 4) [26]. It is
believed that the antioxidants in bilberries that are responsible
for the attainment of high antioxidant capacity of human blood
plasma are primarily a chlorogenic acid, with substantial contribution
of anthocyanins and proanthocyanidins [27]. Specific
antioxidant properties of blueberry probably are also a result
of high concentrations of total anthocyanins [24]. Antioxidants
from this group of polyphenols especially prevalent in fruits
of many species and varieties of blueberries are delphinidin,
occurring in form of galactosides and glucosides. They are given a
substantial share of TAC increase in plasma after consuming large
amounts of fruit. It is believed that a significant effect of blueberry
consumption compared with red grapes fruit on plasma TAC increase
may be due to the higher concentration of anthocyanin in
these fruits. Red grapes are characterized by the presence of large
amounts of resveratrol, a stilbene polyphenol derivative, a compound
that blueberries do not contain, and which in the opinion
of experts, shows a much weaker free-radical scavenging properties
of oxygen than anthocyanins. Research on the effects of
blueberry on organisms have shown that to effectively prevent
decline of TAC in the plasma of human blood, this fruit should be
eaten in larger doses of 100 to 200 g [18].
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