Banca de DEFESA: ÉRICA CABRAL FAGUNDES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ÉRICA CABRAL FAGUNDES
DATE: 03/06/2022
TIME: 13:00
LOCAL: Programa de Pós-graduação em Química -Google Meet
TITLE:

EXTRACTION OF OIL FROM COFFEE GROUNDS, BIOACTIVE COMPOUNDS AND THEIR APPLICATION IN PEEL-OFF TYPE FACE MASKS

KEY WORDS:

Coffee grounds oil, Transesterification recation, caffeine, chlorogenic acid, face mask.

PAGES: 123
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Química dos Produtos Naturais
SUMMARY:

Coffee is the most consumed beverage in the world, and the second most commercialized commodity, generating numerous residues from its processing and consumption. Coffee grounds are the most expressive residue of this production, currently much appreciated for its numerous applications in industry and research, its most valuable component being the oil obtained by extraction with organic solvents. In the present work it is proposed to carry out studies with coffee grounds obtained from two different species (Coffea arabica and Coffea canephora) from the states of São Paulo and Minas Gerais for the extraction of lipids through a Soxhlet extractor using ethanol and n-hexane, after the drying process. The yields obtained from the oil extraction were from 63.83 for the A3E sample to 5.75 for the CH sample. The acid value of the samples ranged from 4.04 mg KOH/g of oil for the 100% Arabica A1 sample to 11.96 mg of KOH/g of oil for the 100% Conilon sample. Given the possibility of obtaining different results for the quantification of fatty acids for the same sample depending on the esterification method used, in this work the acid profile of coffee grounds oil was investigated through three methods involving acid catalysis (BF3/MeOH, and CH3OH/) and basic catalysis (MeONa/MeOH). The main fatty acids identified were palmitic acid (18.50-52.59%), linoleic acid (0-38.18%), oleic acid (2.87-17.69%) and stearic acid (5.49-17.90 %). The contents and chemical profile of fatty acids were obtained by means of gas chromatography with flame ionization detector (GC-DIC) and gas chromatography coupled with mass spectrometry (GC-MS). There were no significant differences in the lipid profile of the samples, regardless of the solvent used, as well as the species originating from the coffee grounds evaluated (Coffea arabica and Coffea canephora). The degree of swelling followed the profile of release of bioactive compounds present in the film and the highest gel fraction was presented by the conillon sample without washing. The films remained with their surface and integrity preserved. And the presence of turbidity and coloration in the solution indicated the presence of bioactive compounds in suspension. The total phenol content in the four analyzed samples ranged from 6.00 ± 0.65 to 7.79 ± 0.58 mg GAE/100mg of sample. The lowest EC50 value was related to the conilon sample. The oil release test in the “peel off” mask showed that the type of coffee, the type of solvent and the washing of the lees significantly interfere with the release of fatty acids, at 232nm Arabica coffee obtained greater release compared to Conilon and at 210nm masks containing Conilon coffee released more than arabica. The wavelength of 210nm (palmitic acid) obtained the best results in the release, and at 232nm (linoleic acid) the release was much lower. In the caffeine and chlorogenic acid release test, sample A2 showed the highest rate of release of both chlorogenic acid (50rpm – 115%, 100rpm – 114.98%) and caffeine (50rpm – 78.22, 100rpm – 61.99), followed by the Conilon sample, 50rpm – 34.81% and 100rpm – 22.40% for the release of chlorogenic acid and 50rpm – 19.88% and 100rpm – 39.65% for caffeine. It was possible to verify the great potential of the solid residue (coffee grounds) obtained daily as a raw material to be used in the cosmetic industry.

BANKING MEMBERS:
Presidente - 1177598 - ROSANE NORA CASTRO
Interno - 2626414 - JOSE GERALDO ROCHA JUNIOR
Externa ao Programa - 2563412 - TATIANA SALDANHA
Externa à Instituição - REGINA LUCIA PELACHIM LIANDA - IFMG