Nutritional Composition, Phytochemical Screening, Processing Methods And Sensory Attributes of a Brew Made from Infusions of Matured Leaves of Arabica Coffee Tree Consumed in Sidama, Kambata and Harar Communities, Ethiopia

Addisu, Woldesenebet (2015) Nutritional Composition, Phytochemical Screening, Processing Methods And Sensory Attributes of a Brew Made from Infusions of Matured Leaves of Arabica Coffee Tree Consumed in Sidama, Kambata and Harar Communities, Ethiopia. Masters thesis, Addis Ababa University.

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Abstract

Coffee leaf tea is a traditional drink for which many consumers in the rural area of Ethiopia are familiar since the early times. In the present study proximate and trace metal composition, selected phyto chemical screening, sensory attribute analysis, and antioxidant level determination of six coffee leaf samples from different sites were determined. Proximate composition in the study samples ranges from (14.43±0.12)% to (18.98±0.55) for protein, (8.821±0.31)% to (12.41±0.23)% for ash,(4.5±0.7 to12.5±2.12)% for crude fat,(17.15±0.69 to 20.01±0.70) % for fiber. The trace element level ranged from (124.16±4.47 to 174.5 ±2.58) mg/100g for calcium, (2.76±0.24 to 93.42±3.41)mg/100g for iron and (9.5±0.5 to79.98±0.94) mg/100g for magnesium. The total phenolic content ranged from (642.74±7.95) mg GAE/g to (301.72±11.32) mg GAE /g of dry weight of extract. Antioxidant activity of extracts was expressed as percentage of DPPH free radicals inhibition levels in percentage ranged from (78.55±0.55 to 98.27±0.028) %. An ant nutritional factor ranges from 63.39±9.70 to 125.70±20.68mg/g for tannin and 29.71±1.77 to 36.02±0.50mg/g for phytate, respectively. Caffeine content ranges from (691.26 to 1443) ppm. Methanolic extracts of coffee leaf samples from different sites have showed that the highest phenolic concentration and strong antioxidant activity. The high contents of phenolic compounds indicated that these compounds contribute to the antioxidant activity and this indicates that coffee leaves can be regarded as promising candidates for natural antioxidants.

Item Type:	Thesis (Masters)
Subjects:	Q Science > Q Science (General) Q Science > QH Natural history > QH301 Biology
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	18 Jun 2018 14:11
Last Modified:	18 Jun 2018 14:11
URI:	http://thesisbank.jhia.ac.ke/id/eprint/4485

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