Effect of Zataria multiflora Boiss. essential oil, NaCl, acid, time, and temperature on the growth of Listeria monocytogenes strains in broth and minced rainbow trout

Abstract

The small outbreaks of listeriosis as one of the leading causes of food poisoning‐associated deaths occur more than previously reported. In current study, the growth ability of Listeria monocytogenes strains isolated from different sources of food and human origin was measured under salt stress (0.5%, 2.5%, 5%, 7.5%, and 10%) and acid environments (pH = 6.64 and 5.77) for 96 hr by using a Bioscreen C microbiology reader at 37°C. In further steps of this study, after analysis of constituents of Zataria multiflora Boiss. essential oil (ZMEO), the sensory evaluation of the treated fish meat with ZMEO was performed. Then, the fish isolate of L. monocytogenes was exposed to sensory acceptable and subminimum inhibitory concentrations (subMICs) of ZMEO in fish broth and minced fish meat during incubation at abuse (12°C), room (22°C), and optimum (37°C) temperatures for 48 hr. The MIC of NaCl against four strains of L. monocytogenes was 10% at 37°C. The maximum optical densities (ODs) and under curve areas (AUC) of growth patterns in higher pH value and lower contents of NaCl followed the order of 21C > 6F > 66C > 22C of L. monocytogenes strains, while the lag time was prolonged in the reverse order. The maximum OD, growth, and lag times of samples treated with higher contents of NaCl and lower pH value were affected in a different order. The organoleptic evaluation showed that the fish meat treated with less than 0.5% of ZMEO was sensory acceptable. The population of L. monocytogenes remained relatively constant at the inoculation level of 107 cfu/ml (or g) at 12°C in broth and minced fish mediums. The inhibitory antilisterial activity of essential oil as an extensive‐used plant for food and pharmacological applications is negligible due to possible adverse sensory and toxic effects at relevant high doses.

Addition of lime juice and NaCl to minced seafood may stimulate the expression of Listeria monocytogenes virulence, adhesion, and stress response genes

“…Raw and processed seafood are significant vehicles for the contamination of L . monocytogenes (Hosseini et al., 2021 ; Zhao et al., 2020 ). Shrimp, as the most economically important internationally traded seafood, has a favorable condition for the growth of microorganisms during handling and processing (FAO, 2020 ).…”

Protective Effects of Sanyar Prebiotic on Immunity and Tissue Changes of Common Carp (Cyprinus carpio) Exposed to CuSO4 Stress

“…Based on the importance of the type and quality of food on aquatic production and the role of fsh immunity, the possibility of increasing the resistance of fsh exposed to copper sulfate was investigated after feeding with Sanyar prebiotic diet. Various studies have been carried out related to the resistance of fsh to food supplements including various types of prebiotics [14][15][16][17][18]. Several studies have been conducted on the role of dietary supplements in enhancing resistance against various stresses, such as toxins and diseases [19,20].…”

The effects of methylcellulose coating containing carvacrol or menthol on the physicochemical, mechanical, and antimicrobial activity of polyethylene films

“…Active packaging is a new and interesting packaging in the food industry that increases the shelf life of packed products by increasing food safety and maintaining their quality during the storage period (Hosseini et al., 2021; Kazemi et al., 2020; Vilela et al., 2018; Wang et al., 2020). These active systems often contain active compounds that can be released into the interior of packaging.…”