Spectrophotometeric determination of phenols using gallic acid and iron in different samples of tea. | ||
| journal of kerbala university | ||
| Article 1, Volume 8, Issue 2, June 2012, Pages 80-88 PDF (0 K) | ||
| Abstract | ||
| This research is dealing with seven sample of black tea that were respectively as follows: Ahmad Tea-London, Al-Otuor Tea-Ceylon, Mahmood Tea-Ceylon, Apple Tea-Srilanka, Alwazah Tea-Ceylon, Jawhart Alrabea-India, and unpacked mixed Local - Tea. Samples were extracted by distilled deionized water and by using standard calibration curve of gallic acid as a reference material in determination of phenols in tea solutions so the concentrations of phenols were determined and by using UV-Visible spectrophotometer working at 280 nm. Results have shown that the higher concentration of phenols was recorded for Alwazah Tea 3758 mg/L in other word equal to 75.2 mg GAE /gm of dry tea and at pH equal to 4.71. While a higher concentration of phenols was recorded for black tea in United Kingdom at 2002 equal to 103 mg GAE /gm of dry tea. The results have also shown that the Lowest concentration of phenols was recorded for Jawhart Alrabea Tea 3164 mg/L in other word equal to 63.3 mg GAE /gm of dry tea and at pH equal to 4.51. While a lowest concentration of phenols was recorded for black tea in United Kingdom equal to 80.5 mg GAE /gm of dry tea. Samples were also tested for metal (Fe) content using atomic absorption spectrophotometer depending on standard calibration curve, results have shown that samples which have been subjected to analysis few concentrations of iron were existed in some of the samples and the range was from 0.1 mg/L to 2.8 mg/L, while the other samples the concentrations were not detected. | ||
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