Abstract

PACHECO, Teresa M.; TORREZ ALVAREZ, Sergio  and  ALMANZA, Giovanna R.. Quantification of bioactive compounds in Coffea Arabica shell in Bolivia. Rev. Bol. Quim [online]. 2018, vol.35, n.5, pp.117-126. ISSN 0250-5460.

ABSTRACT In this study, we established the content of protocatechuic acid (AP), chlorogenic acid (ACG) and caffeine (CAF) in 11 samples of coffee husks obtained from several coffee companies from northern La Paz in Bolivia. The content of these compounds was quantified by an HPLC-DAD method using an external standard in each case. The results showed that the content of AP varíes between 0.32 and 9.25 mg/g of husks, the content of CAF between 0.55 and 35.68 mg/g of husks, and the content of ACG between 0.04 and 17.06 mg/g of husks. The sample with the highest AP concentration carne from the company Villa Oriente with 9.25 mg/g of dry husks; the highest concentration of CAF was from the company Chulumani Café with 35.68 mg/g of dry husks, and the sample with the highest concentration of ACG was from the company Chulumani Café with 17.06 mg/g of dry husks, high valúes in AP and CAF in comparison to others reported for coffee husks. In addition, we determined an effective method to obtain extracts enriched in phenolic compounds (ERCF) and in caffeine (ERC), using only solid-liquid and liquid-liquid extraction processes. ACG and the AP were quantified in the ERCF whereas CAF was quantified in ERC coming from samples of coffee husk from every company surveyed. Concentration valúes ranged up to 99.19 mg/g for the content of AP (Villa Oriente Company), 66.22 mg/g of ACG of the ERCF and a concentration of 850.69 mg/g of CAF of the ERC (Chulumani Café Company).

Keywords : Protocatechuic acid; Caffeine; Chlorogenic acid; Coffea arabica; Coffee husk; coffee silverskin; La Paz; Bolivia.

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