Physicochemical, microbiological, and sensory characterization of fermented coffee pulp beverages
Coffee pulp is the first by-product generated from coffee processing, a contaminating residue due to its composition and production volume. So, this research presents the use of coffee pulp with honey and sugar cane juice to elaborate alcoholic beverage and infusion. The harvested coffee was washed, pulped; the pulp was distributed in 3 treatments, by duplicates, (T) coffee pulp and water, (M) coffee pulp, water and honey, (G) coffee pulp and sugar cane juice. Then, each treatment was brought to 85 °C for 15 minutes, warmed up and yeast was added to each container. Fermentation was carried out for 14 days at 15 °C. After the liquid was separated from the pulp, the liquid fraction was left to ferment another 14 days, it was clarified with bentonite, it was bottled and for 102 days mature, the degrees of alcohol was measured by simple distillation. The pulp was placed in an oven at 75 °C for 3 days, the chemical composition was analyzed by FTIR, it was packed in hermetic bags, the dry coffee pulp was used to prepare an infusion. For its use, a fermented drink and an infusion were elaborated, evaluating physicochemical, microbiological, and sensorial characteristics through three treatments. The fermented drinks presented values of alcohol degrees 7°- 6°. The treatment with honey obtained a greater acceptance followed by the treatment with sugar cane juice. The infusions were acceptable, differentiated by herbal notes, pleasant aromas, and sweet flavors. In the pulp, the following were characterized by FTIR chemical compounds and wavelengths that show their absorbencies; caffeine with ranges of 2920-2850 and 1620 cm-1, 3280 cm-1 H2O, 1740 cm-1 lipids, 1240 cm-1 chlorogenic acid, and 1015 cm-1 carbohydrates. Finally, the infusions with coffee pulp were accepted by the evaluators, especially those that went through the fermentation process with honey and sugar cane.
Keywords: Caffeine; Coffee; Chemical compounds; Fermentation; Sensory analysis.
, N. T. C. Bebidas alcoholicas, Vino de frutas quinta actualización (Alcoholic beverages, Fruit wine fifth update). 2008. Bogota. Colombia: Colombian Institute of Technical Standards and Certification. ICONTEC. Available in: https://tienda.icontec.org/gp-bebidas-alcoholicas-vinos-de-frutas-ntc708-2000.html>. Access in: July, 02, 2021.
BARRIOS-RODRÍGUEZ, Y.; COLLAZOS-ESCOBAR, G. A.; GUTIÉRREZ-GUZMAN, N. ATR-FTIR for characterizing and differentiating dried and ground coffee cherry pulp of different varieties (Coffea Arabica L.). Engenharia Agrícola, 41(1):70-77, 2021.
BONILLA-HERMOSA , V. A.; DUARTE, W. F.; SCHWAN, R. F. Utilization of coffee by products obtained from semiwashed process for production of valueadded compounds. Bioresource Tecnology, 166:142-150, 2014.
BRAHAM, J. E. Pulpa de café: Composición, tecnología y utilización. Guatemala: Instituto de Nutrición de Centro América y Panamá, Guatemala. 1978. 152p.
CORRO G., PANIAGUA L., PAL U., BAÑUELOS F., ROSAS M. Generation of biogas from coffee-pulp and cow-dung co-digestion: Infrared studies of postcombustion emissions. Energy conversión and Management. 74: 471-481. 2013.
CRAIG A. P. et al. Mid infrared spectroscopy and chemometrics as tools for the classification of roasted coffees by cup quality. Food Chemistry, 245:1052-1061. 2018.
CRAIG, A. P.; FRANCA, A. S.; OLIVEIRA, L. S. Evaluation of the potential of FTIR and chemometrics for separation between defective and non-defective coffees. Food Chemistry. 132:1368-1374, 2012a.
CRAIG, A. P.; FRANCA, A. S.; OLIVEIRA, L. S. Discrimination between defective and non-defective roasted coffees by diffuse reflectance infrared Fourier transform spectroscopy. LWT, 2(47):505-511, 2012b.
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