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Effect of Long Pasteurization Run Times on Bacterial Numbers in Milk

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Effect of Long Pasteurization Run Times on Bacterial Numbers in Milk Utah State University DigitalCommons@USU All Graduate Theses and Dissertations Graduate Studies 8-2020 Effect of Long Pasteurization Run Times on Bacterial Numbers in Milk Brynli Tattersall Utah State University Follow this and additional works at: https://digitalcommons.usu.edu/etd Part of the Food Microbiology Commons, Food Processing Commons, and the Nutrition Commons Recommended Citation Tattersall, Brynli, "Effect of Long Pasteurization Run Times on Bacterial Numbers in Milk" (2020). All Graduate Theses and Dissertations. 7910. https://digitalcommons.usu.edu/etd/7910 This Thesis is brought to you for free and open access by the Graduate Studies at DigitalCommons@USU. It has been accepted for inclusion in All Graduate Theses and Dissertations by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. EFFECT OF LONG PASTEURIZATION RUN TIMES ON BACTERIAL NUMBERS IN MILK by Brynli Tattersall A thesis submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE in Nutrition and Food Sciences Approved: ______________________ ____________________ Donald J. McMahon, Ph.D. Almut H. Vollmer, Ph.D. Major Professor Committee Member ______________________ ____________________ Craig J. Oberg, Ph.D. Janis L. Boettinger, Ph.D. Committee Member Acting Vice Provost for Graduate Studies UTAH STATE UNIVERSITY Logan, Utah 2020 ii Copyright © Brynli Tattersall 2020 All Rights Reserved iii ABSTRACT Effect of long pasteurization run times on bacterial numbers in milk by Brynli Tattersall, Master of Science Utah State University, 2020 Major Professor: Dr. Donald J. McMahon Department: Nutrition, Dietetics and Food Sciences Raw milk requires pasteurization to kill pathogens and reduce spoilage organisms before being used in product manufacture. High-temperature short-time (HTST) pasteurization is the most common form of pasteurization in the dairy industry. High- temperature short-time pasteurizing is the heating of milk to 72°C for 15 s. The high temperatures in the heating section of the pasteurizer are too high for bacteria to adhere to and grow on the heat exchanger plates, but a few thermoduric bacteria and bacterial spores survive. Once through the heating section of the pasteurizer, these organisms can attach to the walls of the downstream sections of the pasteurizer, beginning the formation of a biofilm. During long run periods, some portions of the downstream regeneration and cooling sections will remain at a temperature permitting spore germination and bacterial growth. Following the attachment of cells, these cells divide and produce exopolysaccharides resulting in biofilm growth and thickening. Cells from the biofilm can then be shed into the pasteurized product. Long pasteurizer operation times are preferred in industry because it requires less cleaning and shutdowns so more product can iv be processed and thereby increasing yield. However, these long operation times can result in biofilm-bound spoilage bacteria being released into the pasteurized product with detrimental effects on product quality. As bacterial numbers in the biofilm increase, more bacteria and biofilm material can be released into the pasteurized milk. Microorganisms released from biofilms can cause defects in milk powders or cheese and also increase its microbial load thus decreasing its value. The presence of bacterial spores is a concern for milk powders because spores can survive in extreme conditions. Once the milk powders are rehydrated, the spores can then germinate and cause spoilage. Both Geobacillus stearothermophilus and Anoxybacillus flavithermus are thermophilic spore-forming bacteria commonly found as contaminants in milk powders. Nonstarter lactic acid bacteria are also of importance as they are known to cause some defects in cheese. Streptococcus thermophilus is a common bacterium known to survive the pasteurization process and cause defects in cheese. Paucilactobacillus wasatchensis is a nonstarter lactic acid bacterium that has been found to cause a gassy defect in aged cheddar cheese. To determine the extent of biofilm build-up and release of bacterial cells into the product over long operation times of an HTST pasteurizing system, a lab-scale pasteurizer was fabricated and operated continuously for 18 h. Samples were collected, and bacterial load determined as a function of time. Bacteria present in each sample were isolated and identified using 16S rRNA amplicon data to determine the constituent species of any biofilm material present in the samples. (91 pages) v PUBLIC ABSTRACT Effect of Long Pasteurization Run Times on Bacterial Numbers in Milk Brynli Tattersall This project was funded by the Western Dairy Center to understand how long a milk pasteurizer can be operated before increases in bacterial numbers are observed in the pasteurized milk. While pasteurization kills pathogenic bacteria there are some non- pathogenic bacteria that can survive and have the ability to become attached to the surfaces in the cooling sections of the pasteurizer. Some bacteria can also produce spores that survive pasteurization even if the bacterial cells are killed. Temperatures in the cooling section remain in a range suitable for growth of these heat-tolerant bacteria and can allow germination of bacterial spores. While this is not a health issue, it can affect the quality of the milk and other dairy foods if spoilage bacterial numbers become high. We constructed a laboratory-scale heat exchanger for pasteurizing milk and monitored the number and type of bacteria contained in the milk. The system was operated for 18 hours with a continuous flow of milk being heated (to 72°C (161°F) for 15 seconds) followed by cooling. Sample of milk were collected every hour and then analysed for the number of bacteria and the number of bacterial spores. Bacteria that would have survived pasteurization (thermophilic bacteria) of the milk stayed at the baseline level for the first 7 hours of processing. There was a 10 to 20 fold higher level of bacteria in the milk after 8 hours processing, followed by another 10 fold increase after 14 hours of processing. Operating a pasteurizer for extended times will lead to increased bacterial load in pasteurized milk which can cause quality problems. vi ACKNOWLEDGMENTS I would like to thank Dr. Donald J. McMahon for his kindness and invaluable support and guidance he provided for me throughout my time as his student. I would also like to thank Dr. Craig J. Oberg and Dr. Almut H. Vollmer for their mentorship. I am thankful for the BUILD Dairy program that has funded my research and offered me many opportunities to grow both academically and personally. I want to thank the Aggie Creamery and its production staff, especially Dave Campbell, as they were a huge help to me during my research. I would like to thank my husband, Dayne Tattersall, for his unwavering support. Brynli J. Tattersall vii CONTENTS Page ABSTRACT .................................................................................................................... iii PUBLIC ABSTRACT ..................................................................................................... v CONTENTS ................................................................................................................... vii LIST OF TABLES .......................................................................................................... ix LIST OF FIGURES ......................................................................................................... x LIST OF ABBREVIATIONS ........................................................................................ xii INTRODUCTION ........................................................................................................... 1 HYPOTHESIS AND OBJECTIVES ............................................................................... 3 LITERATURE REVIEW ................................................................................................ 4 Continuously Operated Dairy Processing Equipment ........................................ 4 Fouling in Milk Heat Exchangers ...................................................................... 4 Biofilms .............................................................................................................. 5 Biofilms and the Dairy Industry ......................................................................... 6 Formation of Biofilms in Milk Pasteurizing Heat Exchangers .......................... 7 Raw Milk Microbiota ......................................................................................... 9 Spoilage Bacteria .............................................................................................. 11 Conclusion ........................................................................................................ 12 MATERIALS AND METHODS ................................................................................... 14 Heating Trials ................................................................................................... 14 Sample Collection and Preparation .................................................................. 18 Enumeration of Bacteria ................................................................................... 20 Identification of Bacteria .................................................................................. 20 Statistics ...........................................................................................................
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