Effects of monolaurin and lactic acid bacteria starter culture on growth of vegetative cells of Bacillus cereus in Iranian white fresh cheese
Journal Title: Iranian Journal of Veterinary Science and Technology (IJVST) - Year 2012, Vol 4, Issue 1
Abstract
The harmful effects of many chemical food preservatives are well established, so this has triggered interest in natural methods of preservation. Monolaurin, a monoester of lauric acid, founds naturally in some foods and has various antiviral and antibacterial activities. Evaluation of the effects of monolaurin separately and in combination with lactic acid bacteria (LAB) starter culture on growth of vegetative cells of Bacillus cereus ATCC11778 in manufactured cheeses was the purpose of this research. In this study, the number of B. cereus in four groups of cheese (C1: without starter culture and monolaurin, T1: without starter culture; with monolaurin, C2: with starter culture; without monolaurin, T2: with starter culture and monolaurin) was counted on days 0, 1, 3, 5, and 7 of manufacture. In T1 group, monolaurinin concentrations of 800, 1200, 1600 and 2000 ppm decreased the number of B. cereus by 1.2, 2.1, 3 and 3.4 logs, respectively in comparison with C1 group. InT2 group with the same concentrations of monolaurin, the number of B. cereus in comparison with C2 group was not significantly affected (p>0.05). In C2 group, starter culture decreased the number of B. cereus by 2.9 logs in comparison with C1 group. In contrary, the combination of starter culture with monolaurin in T2 group increased the number of B. cereus by 0.6 logs in comparison with C2 group. Furthermore, in C2 and T2 groups by increasing the storage time, the number of B. cereus decreased. According to these results, it can be concluded that in cheese samples of T1 group, monolaurin separately showed the inhibitory effects on the growth of B. cereus cells while in cheese samples of T2 group, the combination of monolaurin with starter culture did not demonstrate the synergistic inhibitory effects on the growth of this bacterium. Therefore, simultaneous use of monolaurin with starter culture is not recommended for improving the microbial shelf-life of Iranian white fresh cheese.
Authors and Affiliations
Moslem Neyriz-Nagadehi,Seyed Mehdi Razavi-Rohani,,Gity Karim,,Amir Zeynali,
Keywords
Related Articles
- EP ID EP722517
- DOI -
- Views 38
- Downloads 1
Detection of Ciprofloxacin resistance genes in Escherichia coli isolated from dogs with urinary tract infections
This research was performed on uropathogenic Escherichia coli (E. coli) isolates and established the genes of resistance to ciprofloxacin between the isolates. A total of one hundred and three urine samples were tested f...
In vitro acaricidal activity of Melia azedarach ripe fruit extract against Hyalomma excavatum (Acari: Ixodidae)
The current study aimed to evaluate the effect of dichloromethane extract of Melia azedarach ripe fruit on larvae and adult females of Hyalomma excavatum at concentrations of 0.25, 0.5, 1, 2, and 4%, using the larval imm...
Cross Immunity of a Sonicated Trivalent Avian Colibacillosis Vaccine to Pathogenic Escherichia coli O26 and O78 Strains in Broiler Chickens
Colibacillosis outbreaks are a global issue affecting the poultry industry. There is no cross-immunity among the strains of APEC. If a vaccine induces cross-immunity, it will play a key role in preventing colibacillosis....
Detection of mutant infectious bronchitis viruses of GI-23 lineage from commercial chicken flocks in Khorasan Razavi province, Iran in 2019
Infectious bronchitis (IB), caused by infectious bronchitis virus (IBV), is one of the most important respiratory diseases in poultry. The implementation of preventive measures, including vaccination and biosecurity, is...
Therapeutic effects of pomegranate (Punica granatum) pith and carpellary membrane extract on lead-induced toxicity in rats
Pomegranate is an ancient edible fruit with various pharmaceutical bioactivities such as antioxidant, lipid regulation and anti-inflammation. In this study the effectiveness of pomegranate pith and carpellary membrane (P...