A trimethoxyellagic acid glucuronide from Conocarpus erectus leaves: Isolation, characterization and assay of antioxidant capacity

Figures & data

Compound (6):  3,3′,4′-tri-O-Methylellagic acid 4-O-β-glucupy-ranuronide (3,3′,4′-trimethoxyellagic acid 4-O-β-glucupy-ranuronide).

Table 1.  Isolated known phenolic compounds from Conocarpus erectus.

Compound	Identity	Reference
1	Gallic acid	Nawwar et al., 1982
2	Brevifolin carboxylic acid	Nawwar et al., 1994
3	Quercetin 3-O-glucuronide	Nawwar et al., 1984
4	Myricetin 3-O-glucuronide	Nakanishi et al., 2007
5	Syringetin 3-O-glucuronide	Bohm et al., 1975
7	Ellagitannin, castalagin	Nonaka et al., 1985
8	Quercetin	Nawwar et al., 1984
9	Myricetin	Nakanishi et al., 2007
10	Syringetin	Yasukawa et al., 1990
11	3,4,3′-Trimethoxyellagic acid	Alam et al., 2007
12	3,3′-Dimethoxyellagic acid	Nawwar et al., 1982
13	Ellagic acid	Nawwar et al., 1982

Figure 1.  Inhibitory effect of Conocarpus erectus on the production of dihydroxybenzoic acids (DHBA) from salicylic acid in the hypoxanthine/xanthine oxidase assay.

Figure 2.  Inhibitory effect of purified phenolic compounds on the production of dihydroxybenzoic acids (DHBA) from salicylic acid in the hypoxanthine/xanthine oxidase assay. Compounds and IC₅₀ values are: gallic acid (1) (1.43 μM), myricetin 3-O-β-glucupyranuronide (4) (2.60 μM), quercetin 3-O-glucupyranuronide (3) (3.14 μM), syringetin 3-O-β-glucupyranuronide (5) (7.01 μM), and 3,3′,4′-trimethoxyellagic acid 4-O-β-glucupyranuronide (6) (11.22 μM).

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