Pulsed electric filed (PEF) is a non-thermal food preservation method as alternative to traditional thermal method. The effect of pulsed electric field (PEF) on inactivation of yeast Saccharomyces cerevisiae (S.cerevisiae) in apple juice containing different sugar concentration was studied. The results of this study have shown that, using PEF, the yeast could be inactivated at room temperature (20°C). The inactivation effect of PEF was dependent on pulse number, field strength, and pulse width as well as sugar concentration. Pulse numbers less than 20 pulses (at 12.6kV/cm) had no or very less effect on yeast inactivation. Increasing the pulse number up to 400 pulses resulted about 3 logs yeast inactivation. The most important factor for yeast inactivation was the field strength (10 to 30 kV/cm). Whereas, at 10.2 kV/cm and 100 pulses, less than 2 logs yeast inactivation could be achieved, was the yeast inactivation at filed strength of 30kV/cm and 100 pulses about 5 logs. At given field strength and pulse number, longer pulse width (1 to 2.5 μF) affected positively the inactivation of microorganism. In contrast, increasing the sugar concentration in apple juice higher than 20% negatively affected the inactivation of yeast during PEF treatment at given treatment conditions.
The effect of high electric filed pulses on sugar extraction from sugar beet strip during continuous pilot scale extraction was investigated. The results have shown that sugar beet strip could be extracted at moderate temperature (35-50°C) using PEF pre-treatment. The sugar extraction yield of PEF pre-treated samples was about 98.5 to 99.8 % (for extraction times of 30 an 70 min at 50 °C respectively). In contrast, the sugar extraction yield for untreated samples was distinct lower (92.5 % at 50 °C, 30 min and 94 % at 50 °C and 70 min extraction time. In additions, the pressing of PEF pre-treated extracted pulp was more effective than thermal extracted (at 70 °C) sample. Furthermore, the drying of PEF pre-treated extracted pulp was faster than drying of pulp from thermal extracted sample. The results of this study confirmed that the PEF technique is an energy and time saving method for continuous sugar beet processing.
Coconut oil is edible oil extracted from endosperm of coconut (Cocos Nucifera) using different methods. In this report the coconut oil extraction from coconut meat rasp using pineapple enzymes were studied and compared with commercial enzymatic oil extraction. Pineapple enzymes were extracted from fresh pineapple fruit. The effectiveness of pineapple enzyme extract on coconut oil extraction from coconut meat rasp was studied at different enzyme concentrations of 0.5 to 2% (W/W) and pH of 4.5 to 7.5 with incubation times of 2 to 8 hr at 40 to 70 °C respectively. The commercial technical enzymes used in this study were from different companies (Valley enzyme®, Novozyme® and AB-enzyme®). Valley enzyme® at 1% (w/w) enzyme concentration and 1:1 enzyme solution to coconut rasp ratio found to be the most effective commercial enzyme in comparison with Novozyme® and AB-enzyme®. The optimum conditions for coconut oil extraction from coconut meat rasp using pineapple enzyme were at 1% (W/W) enzyme concentration, pH 6.5, 60 °C and 6 hr, while the optimum conditions for Valley enzyme were at pH 5.5, 60 °C and 6 hr. Oil yield obtained from Valley enzyme® and pineapple enzyme extract under optimum conditions were 21.89% and 20.50%, respectively. Therefore, the pineapple enzyme extract is a promising natural alternative to commercial technical enzymes for coconut oil extraction.
The effect of cold atmospheric plasma (ACP) technique on inactivation of selected microorganisms was investigated. To study the effect of cold plasma on microorganism inactivation Dielectric Barrier Discharge (DBD) plasma was applied. The inactivation of yeast (Saccharomyces cerevisiae) and 4 pathogen microorganisms (Salmonella typhimurium, Listeria monocytogenes, Escherichia coli, and Staphylococcus aureus) using DBD cold plasma were investigated. The results have shown that yeast can be effectively inactivated on agar plate within 5 min cold plasma treatment. Adding H2O2 in concentration of 2 or 5% on agar plate improved the inactivation of microorganisms using cold plasma. Furthermore, it was observed that it is possible to inactive pathogen microorganisms on agar plate using DBD cold plasma within 3 to 5 min treatment time. Up to 57%, 96%, 91% and 94 % pathogen microorganisms inactivation was achieved after 1 min DBD plasma treatments of S. aureus, L. monocytogenes, E. coli, and S. typhimurium respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.