High hydrostatic pressure processing of fresh juice and a fermented beverage of black cherry (Prunus serotina)

The aim of this study was to evaluate the effect of high hydrostatic pressures (HHP) (200 MPa for 10 min, 400 MPa for 10 min, and 600 MPa for 5 min) and VAT pasteurization (60 °C for 30 min) on the microbiological, antioxidant and sensory characteristics of fresh juice and a fermented beverage of black cherry (Prunus serotina) stored for 49 days at 4 ± 1 °C. The HHP processing was effective to reduce the microbial load before storage and during the storage of the fermented beverages; however, for the reduction of the microbial load in fresh juice, a minimum pressure of 600 MPa for 5 min was necessary. At day 0, a reduction of 4.10 logarithmic cycles was achieved in samples processed by HHP and VAT pasteurization. The processed samples showed significant changes (p ≤ 0.05) in their color characteristics. All fermented beverages of black cherry had lower quantities of antioxidant activity, total phenols, flavonoids and anthocyanins. The highest antioxidant characteristics were observed in sample of black cherry processed at 600 MPa for 5 min. The black cherry VAT processed samples were the least sensorially accepted. A treatment of 600 MPa for 5 min could be enough to obtain a microbiologically safe fermented black cherry beverage stable for 49 days having similar antioxidant characteristics as those of fresh juice

Effect of the application of an edible film with turmeric (Curcuma longa L.) on the oxidative stability of meat

The aim of this study was to develop an edible alginate-based film produced with turmeric (EFT), as an active compound, and evaluate its antioxidant capacity for application in fresh pork loin, beef loin, and chicken breast. The EFT was characterized by barrier parameters, color, and mechanical, structural, and antioxidant properties. Meat samples with and without EFT were stored at 4°C and analyzed at 2-day intervals. The meat samples with EFT showed significant differences (p < .05) in color (CIE L*a*b*) and exhibited lower TBARS values compared with those without EFT. The addition of turmeric in the film, besides affecting its physicochemical and structural properties, contributed an important antioxidant effect for the meat

Analysis by response surface methodology of gold nanoparticles obtained by green chemical reduction using aqueous coffee pulp extract (Coffea arabica)

Green synthesis of gold nanoparticles using an aqueous coffee (Coffea arabica) pulp extract as a reducing agent was achieved and analyzed by response surface methodology, given the diverse applicability of these nanoparticles containing a wide range of phenolic compounds from the coffee pulp extract. Three factors (precursor concentration, reducing agent concentration, and reaction time) were considered and their combined effects on the maximum intensity (MA), particle size (d), and particle density (N) were analyzed. An opposing effect between the precursor and reducing agent was observed during synthesis because while the precursor increased d and diminished N, the reducing agent diminished d and increased N. These effects were observed simultaneously through the response surfaces of d and N. This methodology allowed the synthesis of nanoparticles with an average particle size between 5–22 nm and N around 2.9x10The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author