Reaproveitamento do resíduo do café em pó para formulação de um sabonete esfoliante em barra

Abstract

Coffee dregs are a by-product generated after consumption of the beverage. Its characteristics, composition and its great applicability and potential have aroused the interest of researchers in the development of several products. The cosmetics industry, recognizing the great value of this waste, incorporated it into its products, enhancing its formulations and also contributing to the environment. Therefore, the objective of this study was to use this coffee powder residue for a formulation of an exfoliating soap in bar, by comparing the formulations FB (glycerin and coffee dregs formulation), FC (glycerin formulation), FBO (formulation glycerin and dregs coffee and essential oil) and FGO (glycerin and essential oil formulatiom). In view of the above, the coffee dregs underwent a moisture test through convective drying. After this process, granulometric and X-ray fluorescence analyzes were performed to determine the elemental composition of the sludge. As for the production of soaps, different tests were carried out in order to evaluate the formulations regarding pH, detergency, crack formation, water resistance, acidity index and its morphology through optical microscopy. A moisture content in the sludge of 69.76±3.7% on a wet basis was obtained. X-ray fluorescence showed components such as: magnesium (Mg), aluminum (Al), phosphorus (P), potassium (K), iron (Fe), calcium (Ca), manganese (Mn), sulfur (S), chlorine (Cl), copper (Cu), zinc (Zn), rhodium (Rh) and cadmium (Cd). The pH of the formulations are, respectively, FBO 10.63±0.004, FB 10.56±0, FGO 10.31±0 and FC 10.25±0. The water resistance analysis showed that the mass absorbed in % in the soaps are, FBO 1.56±0.62, FB 2.67±0.17, FGO 2.35±1.22 and FC 2.82±1 ,23. The crack test showed that the soaps are resistant to external agents (light, humidity and temperature) and for this reason none of them formed cracks on their surfaces. The detergency index in mL found was FBO 1.8±0.29, FB 2±0, FGO 1.9±023 and FC 2±0. The acid number in mg KOH/g in the formulations were FBO 0.9±0.0056, FB 0.8±0.029, FGO 0.78±0.038 and FC 0.84±0.169 within the limits allowed by Anvisa.