The objective of this study is to analyze and compare tannins of three commonAcaciaspecies of Sudan, since vegetable tannins are important in leather industry.Acacia niloticaandAcacia seyalsamples were collected from Sunt Forest in Khartoum State, whileAcacia senegalsamples were collected from the Debabat Forest in South Kordofan State. Bark samples from bulk collections of the threeAcaciaspecies were extracted with boiled deionized water. The amount of tannins present in these bulk samples was determined by Folin-Denis method for total phenolic materials, followed by precipitation with hide-powder. The difference between the amount of phenolic materials present before and after addition of hide-powder represents the amount of tannins present. The percentage of tannins in the leaves, bark, and mature and immature fruits of collections of individuals ofAcaciaspecies was estimated; mature and immature fruits ofAcacia niloticacontain tannins (22.15% and 22.10%, resp.). The leaves ofAcacia niloticaandAcacia seyalcontain tannins (11.80% and 6.30%, resp.). The barks ofAcacia seyal,Acacia nilotica, andAcacia senegalcontain tannins (12.15%, 10.47%, and 3.49%, resp.).
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