Browsing by Author "Caldeira, Angelina Janet Raoula Mupiga"
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- Atom transfer radical polymerization synthesis of hybrid cellulose-synthetic adsorbents for valorisation of olive/olive-oil production residuesPublication . Caldeira, Angelina Janet Raoula Mupiga; Dias, Rolando; Mezni, MohamedOlive leaves represent a huge amount of by-products in the production of olive and olive oil. Olive leaves, as pomace and olive mill wastewater, contain some compounds which interest food, cosmetics, and pharmaceutical fields like. To obtain these compounds, some steps must be achieved: extraction, separation, and purification. Ultrasound extraction method were performed to obtain olive leaves extract by using two different solvents (EtOH/Water and Ethyl acetate). These extracts were used to perform sorption experiences with a newly synthesized adsorbent. The synthesis of the adsorbent was performed via ATRP. SEM, FT-IR, HPLC-DAD and UV-visible spectrophotometer were used to get more information about the extracts and the adsorbent material. In olive leaves extracts obtained with the two different solvents, some phenolic compounds were identified: hydroxybenzoic acid, Verbascoside, Luteolin-7-glucoside, and Oleuropein. The synthesis via ATRP using microcrystalline cellulose, Bromoisobutyryl bromide, and 4-Vynilpyridine gave conclusive results. 95.3% of poly 4-Vynilpyridine were found in the final product by gravimetrical analysis; the synthesis gave a percentage of grafting equal to 2045.3%. The sorption experience performed with the olive leaves by using the newly adsorbent material allowed to recover between 30% and 70% of identified polyphenols contained in olive leaves extracts.