Effect of electro-activated aqueous solutions, nisin and moderate heat treatment on the inactivation of Clostridium sporogenes PA 3679 spores in green beans puree and whole green beans. (October 2017)

• Record Type: Journal Article
• Authors: El Jaam, Omar; Fliss, Ismail; Aïder, Mohammed
• Is Part Of: Anaerobe. Volume 47(2017)
• Page Start: 173
• Page End: 182
• Publication Date: 2017-10
• Subjects: C. sporogenes -- Spores -- Electro-activation -- Nisin -- Synergy -- Destruction; Anaerobic infections -- Periodicals; Anaerobic bacteria -- Periodicals; Bacterial diseases -- Periodicals; Computer network resources; Anaerobic protozoa -- Periodicals; 579.3
• DOI: 10.1016/j.anaerobe.2017.05.017
• Languages: English
• ISSNs: 1075-9964

Abstract

Abstract: In this work, the synergistic effect of electro-activated solutions (EAS) of potassium acetate and potassium citrate, nisin and moderate heat treatment to inactivate C. sporogenes PA 3679 spores was evaluated in green beans puree and whole green beans. Electro-activated solutions (EAS) of potassium acetate and potassium citrate were generated under 400 mA during 60 min. They were characterized by an oxidation-reduction potential (ORP) and pH values ranged from +300 to +1090 mV and 2.8 to 3.67, respectively. Moreover, the EAS were combined with a bacteriocin nisin at concentrations of 250, 500, 750 and 1000 IU/mL and the targeted sporicidal effect was evaluated under moderate heat treatment. The inoculated mixtures were subjected to temperatures of 95, 105 and 115 °C for exposure times of 5, 15 and 30 min. After plate counting, the synergistic effect of the hurdle principle composed of electro-activated solutions, nisin and moderate temperatures was demonstrated. The obtained results showed that the synergistic effect of the used hurdle was able to achieve an inactivation efficacy of 5.9–6.1 log CFU/mL. Furthermore, experiments carried out with whole green beans showed that spore inactivation level was significantly higher and reach 6.5 log CFU/mL. Moreover, spore morphology was examined by transmission electron microscopy and the obtained micrographs showed important damages in all of the treated spores. Graphical abstract: Highlights: Electro-activated solutions with nisin are active against C. sporogens spores. Electro-activated solutions with nisin reduce heat treatments severity in foods. Electro-activated solutions with nisin as brine for canned foods. Possibility of producing low heat processed foods.