In this research the effect of edible coatings based on aloe vera and cassava starch on the physicochemical properties and the kinetic parameters of degradation of ascorbic acid (AA) in pineapple minimally processed during 16 days of storage at 4 ° C was evaluated. Five treatments (T1, T2, T3, T4 and T5) were tested, pineapple “honey gold” with coating solutions of different aloe vera / starch concentrations (100/0, 75/25, 50/50, 25/75 and 0/100 respectively), and a control treatment (T6 ) that corresponds to fruit without coating. The coatings were carried out by immersing the fruit previously processed for 1 minute. The results show that the treatment with the best pH values, titratable acidity (AT) and maturity index (IM) was T3 (pH: 3.61, AT: 0.0480, IM: 2.915), in terms of moisture and soluble solids (SS) the T1 treatment (% Moisture: 81.725) and T4 (SS: 11.19) showed the most optimal values. The model that best described the degradative behavior of AA is zero order, being the T4 treatment the most adequate to preserve vitamin C with a value (k: 0.781), a half-life (t ½: 28 days) and a decimal reduction time (D: 93 days).

Contexto: La conservación de frutas mínimamente procesadas es un tema muy importante en la industria alimentaria debido al incremento en el consumo de este tipo de alimentos. Esta investigación estudia los efectos que provocan los recubrimientos comestibles a base de aloe vera y almidón de yuca en piña mínimamente procesada. Método: Se evaluaron propiedades como textura y color, y se realizó análisis microbiano después de 12 días de almacenamiento a 4 °C. Se probaron cuatro tratamientos (T1, T2, T3 y T4): piña Oro Miel con soluciones de recubrimiento con diferentes concentraciones de aloe vera/almidón (T1:75/25, T2:50/50, T3:25/75) y un tratamiento control (T4) que consistió en la fruta sin recubrimiento. Los recubrimientos se realizaron sumergiendo la fruta previamente procesada durante 1 min. Resultados: Los resultados indicaron que el tratamiento T2 obtuvo la mejor textura y T4 mostró una mayor luminosidad. Los parámetros microbiológicos se mantuvieron dentro de los establecidos por la Norma Técnica Colombiana (NTC 4519) para fruta mínimamente procesada durante los 12 días de conservación. Conclusión: El recubrimiento comestible puede mantener la textura e inhibir el crecimiento de microorganismos en la piña Oro Miel. Sin embargo, la luminosidad de la fruta puede verse afectada por el uso de estos recubrimientos comestibles.

No abstract

Biocoagulants have emerged as an environmentally friendly and efficient alternative to surface water clarification, allowing the use of agro-industrial waste as a bioavailable source for the treatment of high turbidity water. The objective of this research was to compare the efficiency in the surface water coagulation process of the Magdalena river using aluminum sulfate and tamarind seeds (Tamarindus indica) dissolved in aqueous solution and saline solution. The clarification process was carried out by testing jar, for this was performed an extraction of the hot and cold tamarind coagulant which were evaluated in conjunction with an inorganic coagulant in different mother dilutions (distilled water and saline) at concentrations of 35 and 40 mg/L and at a stirring speed of 100 and 200 rpm. The parameters of pH, electrical conductivity (S/cm), turbidity (NTU) and color (UPC) were measured during the clarification process. The results show a 97.2% reduction in inorganic treatment (SAL) compared to initial turbidity and a decrease in natural cold extracted (STF) and hot (STC) treatments of 58.2% and 39.1% respectively, when diluted in aqueous solution. While diluting in saline solution there was a greater removal of turbidity when applying aluminum sulfate, followed by STF and STC treatment, with removal values of 99%, 75% and 53% respectively. The highest coagulating activity occurred when applying a dose of 40mg/L and when diluting treatments in NaCl with maximum reported values for SAL, STF and STC treatment of 93%, 85% and 59%. Tamarind seeds proved to be an efficient coagulant for water clarification