Sampling for Microbial Analysis
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1 Sampling for Microbial Analysis Linda J. Harris, Ph.D. Department of Food Science and Technology Microbial Testing One of the most apparent but poorly understood parts of food microbiology and quality assurance 1
2 Why test? Regulatory Recommendation Requirement Testing Program Buyer Requirement Product history In-house Specifications for Ingredients HACCP Validation/Verification Everybody is Doing It It Seemed Like a Good Idea Why not test? No scientific validity Too costly Test not available Don t want to know 2
3 Microbial Testing Effective use requires a clear understanding of the goals, assumptions, and characteristics of the testing program Collecting Samples Lot must be defined, samples selected randomly Microbial sampling is destructive Results may be delayed for several days Perishable product may be impacted 3
4 Sample Size Liquid Sample Random Regular Random cluster Solid Sample Ideal Distribution Reality - Clustering 4
5 Sample Size Based on standard methods for test organism For non-pathogens, typically 10 g Could also be surface area 100 cm 2 For pathogens, typically 25 g, may be higher These samples can be pooled. 60 samples of 25 g can be 4 samples of 375 g. Points of Sampling Raw materials Production line International Port Processors warehouse Retail storage or sales outlet 5
6 How? - Sampling Plan Written Sampling Plan Objectives or goals Who will sample? How to sample? (Aseptic Technique) What to sample? How much to sample? How many? How large? How often? How to store/transport? What organism? Utility organisms Aerobic plate count Spoilage microorganisms Indicator organism Coliform Thermotolerant coliform E. coli Specific pathogen 6
7 Problems with Testing for Pathogens Contamination non-uniform Levels are typically low Negative results give no real assurance How? Qualitative Coliform/E. coli Presence/Absence Colilert 7
8 How? Qualitative Coliform/TTC/E. coli - Enumeration SimPlate PetriFilm Nonpathogenic E. coli Coliform/E. coli Enumeration Membrane Filtration Quantitray 8
9 How Is MPN Testing Done? Dilution Factor , ,0001 Original Sample 24-36h + E. coli + E. coli + E. coli - E. coli - E. coli + Coliform + Coliform + Coliform + Coliform - Coliform Refer to MPN table to get statistical value What Do the Tests Tell us About Food Safety? Enteric Bacteria Total coliform Fecal Coliform Erwinia Soft Rot Thermotolerant Coliform Salmonella Enterobacter E. coli Pathogenic E.coli Shigella 9
10 Approximate Distribution of of Phyllosphere and and Rhizosphere Thermotolerant Coliforms that that Test Positive in in Fecal Coliform Assays Possible fecal origin Freq of isolation from plants Citrobacter freundii % Citrobacter spp % Klebsiella pneumoniae 50-80% Klebsiella spp % Enterobacter cloacae % Enterobacter aerogenes 50-70% Unlikely fecal origin Pantoea agglomerans Pantoea spp. Enterobacter sakazakii Serratia marcescens Serratia liquefaciens Serratia odorifera Klebsiella trevisamii highly common highly common highly common very common very common common common Absence of Evidence Will Microbe Testing Assure Food is not Safety? Evidence of Absence Probability Of Microbial Detection Percent Contaminated 10% 5% 2% 1% 0.1% Number of Samples Analyzed >
11 Product Testing Results Review the objectives Use the data. Understand the limitations. Define Critical Limits in Writing What is unacceptable? Define Corrective Action in Writing Action for unacceptable result? Written data disposition policy. General Microbe Testing: Counts, Cleanliness, Pathogen Detection 6 Example Control Chart Microbial Criteria Under Control 5 4 APC Time or Lot 11
12 6 Example Control Chart Microbial Criteria Out of Control 5 4 Catch it here!! APC Time or Lot 6 Example Control Chart Microbial Criteria Out of Control 5 4 APC Time or Lot 12
13 APC Spinach Line Jan Feb Mar Apr May June July Monthly Chart Aug Sept Oct Nov Dec Jan Feb Mar APC APC Spinach Line 4.5 4:30 5:30 6:30 log CFU/100cm APC -Mon APC -Fri 1 Dump Bin Conveyor 1 Elevator 1 Wash Drum Conveyer 2 Line Location Dryer Weigh and Fill Packaging 13
14 Sprout Production - Exception for pathogen testing 14
15 FDA Recommended Screening Every batch Lot started at same time with single lot of seeds 48 h after soak and at least 48 h before harvest E. coli O157:H7 and Salmonella Environmental Testing for Pathogens Tiered Approach for LM in RTE foods First Tier Sampling non-contact locations in high potential areas after cleaning and sanitizing Second Tier Sampling non-contact locations in high potential areas during operation Third Tier Sampling non-contact locations in moderate potential areas after cleaning and sanitizing Fourth Tier Sampling non-contact locations in moderate potential areas during operation Fifth Tier Sampling contact surfaces after cleaning and sanitizing 15
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