Stabilization of phenolic compounds from opuntia oligacantha först by microencapsulation with agave sap (aguamiel)

The aim of this research was to determine the stability of phenolic compounds from Opuntia oligacantha Forst (xoconostle) ¨ by microencapsulation with a blend of biopolymers (maltodextrin and gum arabic) and agave sap (aguamiel) as a thermoprotector. The particle size distribution, morphology, stability during storage at different temperatures and water activity of the microcapsules were determined. The results showed significant differences (P<0.05) among the microcapsules. Higher protection was found in the microcapsules containing aguamiel. The microcapsules had a spherical shape with an average diameter of 7.72 µm. It was observed that the microcapsules containing aguamiel had a minor change in colour independent of the drying temperature and preserved the phenolic compounds for more than 1467 days at a storage temperature of 25 °C. These results suggest the application of microencapsulation with phenolic compounds from xoconostle for food products. Keywords: biopolymers, xoconostle, stability, spray drying

EVALUACIÓN DE PLANTAS DE PITAYA (Stenocereus spp) DE POBLACIONES NATURALES DE MONTE ESCOBEDO, ZACATECAS

"En Zacatecas las pitayas (Stenocereus spp) existen en varios municipios, donde son recolectadas para autoconsumo, aunque en años recientes, en el municipio de Monte Escobedo, Zac., se han convertido en un cultivo con altas perspectivas de comercializaci

Postharvest Behavior of Bioactive Compounds in Tomato Fruits Treated with Cu Nanoparticles and NaCl Stress

Tomatoes are important for human diet due to their content of bioactive compounds. However, is little known about behavior of these compounds during fruit shelf life. The goal of this research was to evaluate the effects on bioactive compounds of tomato fruits stored during different times and conditions, obtained from tomato plants developed under conditions of saline stress and with the application of copper nanoparticles. Four treatments were evaluated: foliar spray of copper nanoparticles (250 mg L−1) with or without saline stress, only saline stress, and the absolute control. The results show that application of copper nanoparticles has a positive effect on the accumulation of bioactive compounds such as total phenols, β-carotene, and vitamin C. The saline stress during the development of tomato plants causes a decrease of the bioactive compounds as well as antioxidant capacity in tomato fruits. However, this negative effect can be reduced with the application of copper nanoparticles. The application of copper nanoparticles may be a technique to increase and maintain the content of bioactive compounds in tomato fruits and can be an effective alternative to diminish the negative effects on bioactive compounds caused by saline stress