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Phenol contents were expressed as mg of gallic acid equivalents (GAEs) per g of extract.
A calibration curve was obtained using 0 4000 mg of gallic acid per milliliter and used to calculate the total phenolic content of the tea seedling leaves.
The results are reported as the mean ± standard deviation and expressed as mg of gallic acid equivalents (GAEs) per kg of honey.
The TPC, TFC and proanthocyanidin values found were: 501.76 ± 14.47 mg of gallic acid equivalents per g, 61.53 ± 0.83 mg of rutin equivalents per g and 10.76 ± 0.89 mg of catechin equivalents per g, respectively.
Under these optimal conditions, the experimental values for total phenolics and flavonoids of Curcuma zedoaria leaves were 125.75 ± 0.17 mg of gallic acid equivalents and 6.12 ± 0.23 mg quercetin/g of extract, which closely agreed with the predicted values.
The total phenolic contents of flesh (42.4 ± 0.04 mg of gallic acid equivalents (GAE /100 g of flesh fresh weight) and peel (39.7 ± 5.39 mg of GAE/100 g of peel fresh weight) were similar.
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LD powder was prepared as described under Section 2. LD extract showed high polyphenol (65 mg equivalent of gallic acid/g of the extract) and flavonoids (80 mg equivalent of rutin/g of the extract) content.
We found high polyphenol (65 mg equivalent of gallic acid/g of the extract) and flavonoid (80 mg equivalent of rutin/g of the extract) content in the LD extract.
Higher absorbance indicates greater antioxidant activity cData expressed in mg equivalent of gallic acid (GAE) to 1 g of extract dData expressed in mg equivalent of quercetin to 1 g of extract eNo activity fReferences are quercetin for DPPH and DMPD scavenging effect, EDTA for metal-chelating capacity, chlorogenic acid for FRAP, and quercetin for PRAP.
The relative standard deviations were found to be in the ranges 0.46 1.96% for 1, 10, 30 mg L−1 of gallic acid (n=11).
The amount of total phenol and flavonoid contents ranged from none to 79.67 ± 2.09 for total phenols as expressed in mg equivalent of gallic acid to 1 g of extract, whilst total flavonoid amount was found to differ from none to 83.63 ± 2.38 as expressed in mg equivalent of quercetin to 1 g of extract (Table 5).
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