Fragmentations Compounds proposed 1 141, 109 Protocatechuic acid 2 191, 179, 173 5-O-Caffeoylquinic acid 3 143, 129, 114 Quinic acid
methyl ester 4 191, 173, 85 3-O-Caffeoylquinic acid 5 135, 107, 89 Caffeic acid 6 191, 173, 134, 93, 87 4-O-Feruloylquinic acid 7 301, 179, 151 Quercetin-O-glucoside 8 301 Rutin 9 353, 235,191, 179, 173, 135 3,4-Dicaffeoylquinic acid 10 353, 191, 179, 173, 135 4,5-Dicaffeoylquinic acid 11 298, 283, 255, 163, 117 4',7'-Dimethoxy luteolin Peak no.
One organic acid (quinic acid
) and four hydroxycinnamic acids were detected: two derivates of caffeoylquinic acid and two derivates of coumaroylquinic acid.
The peak (Rt = 4.87) representing 3-CQA glycoside showed fragment ions (Figure 3(d)) at m/z 353 ([[caffeoylquinic acid-H].sup.-]) due to the neutral loss of a glycoside residue (162 Da), 341 ([[caffeoyl glycoside-H].sup.-]) as a result of a loss of a quinic acid
moiety, 191 ([[quinic acid-H].sup.-]) ascribed to the loss of a caffeoyl glycoside moiety, and 179 ([[caffeic acid-H].sup.-]) (bp) due to the loss of the quinic acid
and glycosyl moieties from the caffeoylquinic acid and caffeoyl glycoside groups, respectively.
The effectiveness of chlorogenic acid and its main metabolites, caffeic and quinic acids
, against oxidative stress was investigated.
derivatives, including 3, 5-dicaffeoylquinic acid, are also present in Lychnophora ericoides (Aster-aceae), popularly known as arnica-da-serra.
Chlorogenic acid (8, tR3.57 min), 3,5- dicaffeoyl quinic acid
(3,5-DCQA, 12, tR6.35 min), and 4,5-dicaffeoyl quinic acid
(4,5-DCQA, 13, tR6.73 min) were unambiguously identified after comparing with reference standards.
Some aromatic flavors, namely blueberry, strawberry and sweet aromatic flavors, negatively correlated with quinic acid
. Oxalic acid correlated with sweet aromatic flavor.
Types and quantities of organic acids detected in molasses hydrolysate Organic acid Concentration (mg/L) Lactic acid 3850 Malic acid 1120 Citric acid 90 Fumaric acid 20 Quinic acid
Not detected Table 3.
Organic acids which are found in fruit are malic citric and quinic acid
. These have a significant effect on taste and flavor of fruit.
More than 93% of all strains did not utilize also i-erythritol, L-rhamnose, D-sorbitol, D-galactonic acid lactone, D-gluconic acid, [gamma]-hydroxybutyric acid, p-hydroxy phenylacetic acid, [alpha]-keto-valeric acid, quinic acid
, saccharic acid, L-leucine, L-ornithine, L-phenylalanine, L-pyroglutamic acid, D-serine, thymidine, phenylethylamine, and putrescine and utilized [alpha]-D-glucose, L-fucose, and sucrose.
Being rich in powerful antioxidants such as quinic acid
, chlorogenic acid and caddeic acids, it protects against inflammation, and also contains chlorogenic acid which reduces blood glucose levels.
[10.] Matsushige K, Basnet P, Kadota S and T Namba Potent Free Radical Scavenging Activity of Dicaffeoyl Quinic Acid
Derivatives from Propolis.