Browsing by Author "Taha Khider Mohamed Bashir"

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    Total Polyphenols and Flavonoids in Sudanese Honey Samples and their Antibacterial Activities
    (جامعة النيلين - كلية الدراسات العليا, 2017-01-16) Taha Khider Mohamed Bashir
    Abstract The total polyphenols of black and green tea samples were detected and quantified by developing a thinspectrophotometric method. Commercial tea brands in Khartoum were chosen for the analysis. Extraction conditions with temperatures ranged from 70°C through 100°C for l0 minutes duration before polyphenols were quantified a.nd showedthat the content was highly unstable at higher temperature (l00°C).Extractions at constant temperature (l00°C) for periods of 1, 5, 10 minutes were also investigated showing increase of the total polyphenollevels during the first five minutes followed byslightly decrease.