U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Food Safety and Intervention Technologies Research: Wyndmoor, PA
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    About ERRC
                        Greetings from the Director
                                    Directions/Lodging
                                    History and Accomplishments
                    Our Work
                        Biomass Pyrolysis Research
                                    IPMP 2013
                                    IPMP Dynamic Prediction
                                    IPMP Global Fit
                                    Pathogen Modeling Program (PMP)
                                    Predictive Microbiology Information Portal (PMIP)
                                    PoultryFARMSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Northeast Area Wyndmoor, Pennsylvania Eastern Regional Research Center Food Safety and Intervention Technologies Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            ZHOU, SIYUAN - Rutgers Universityitem
                                            Sheen, Shiowshuh

                                                         - *Allen*item
                                            Liu, Linshuitem
                                            PANG, YU - Rutgers Universityitem
                                            YAM, KIT - Rutgers University
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/9/2012
                                    Publication  Date: 6/25/2012
                                    Citation: Zhou, S., Sheen, S., Liu, L.S., Pang, Y.H., Yam, K.L. 2012. Inhibition effects of vapor phase thymol and modified atmosphere against Salmonella spp. on raw shrimp [abstract]. IFT Meeting, June 25-28, 2012, Las Vegas, Nevada. 1:1.Interpretive Summary:
                                Technical Abstract: Salmonella contamination of shrimp is a food safety concern in the U.S. and other countries. Natural antimicrobial compounds (e.g. essential oils) in vapor phase and modified atmosphere (MA) technology can inhibit the growth potential of Salmonella spp. However, each strategy has its limitations, while a stronger antimicrobial effect could be expected by using them in combination. 
This research evaluated the combinational inhibition effect of vapor phase thymol and MA towards Salmonella spp. on raw shrimp. In addition, linear regression predictive models were developed to describe the microbial growth characteristics (lag time and maximum growth rate) of Salmonella spp. on shrimp. Growth profiles of a Salmonella spp. cocktail (6 strains) inoculated onto raw shrimp treated with vapor phase thymol at three levels (0, 0.8 and 1.6 mg/l), or MA (60% CO2 + 40% N2), both alone and in combination, at three temperatures (8, 12 and 16 degree C), were determined. Lag time and maximum growth rate for each treatment were obtained using Baranyi & Roberts models. 
Results indicated that combination of vapor phase thymol and MA significantly inhibited the growth of Salmonella spp. For instance, at 8 degree C, the lag time of Salmonella spp. was extended from 54.2 hrs (without treatment) to 143.9 hrs (1.6 mg/l vapor thymol + MA treatment), and the maximum growth rate was reduced from 0.021 log CFU/g/hr (without treatment) to 0.0098 log CFU/g/hr (1.6 mg/l thymol + MA treatment). Synergistic antimicrobial effectiveness was also observed. For instance, at 16 deg C, the lag time of Salmonella spp. was extended 30.6% by the combined treatment (1.6 mg/l thymol plus MA) over that of either treatment alone. Linear regression models for lag time and maximum growth rate under the different stresses were also developed. These models may be used for shelf-life prediction and risk assessments for raw shrimp.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov