Nonstarter Lactic Acid Bacteria Biofilms and Calcium Lactate Crystals in Cheddar Cheese

A sanitized cheese plant was swabbed for the presence of nonstarter lactic acid bacteria (NSLAB) biofilms. Swabs were analyzed to determine the sources and microorganisms responsible for contamination. In pilot plant experiments, cheese vats filled with standard cheese milk (lactose:protein=1.47) an...

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Veröffentlicht in:Journal of dairy science 2006-05, Vol.89 (5), p.1452-1466
Hauptverfasser: Agarwal, S., Sharma, K., Swanson, B.G., Yüksel, G.Ü., Clark, S.
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container_end_page 1466
container_issue 5
container_start_page 1452
container_title Journal of dairy science
container_volume 89
creator Agarwal, S.
Sharma, K.
Swanson, B.G.
Yüksel, G.Ü.
Clark, S.
description A sanitized cheese plant was swabbed for the presence of nonstarter lactic acid bacteria (NSLAB) biofilms. Swabs were analyzed to determine the sources and microorganisms responsible for contamination. In pilot plant experiments, cheese vats filled with standard cheese milk (lactose:protein=1.47) and ultrafiltered cheese milk (lactose:protein=1.23) were inoculated with Lactococcus lactis ssp. cremoris starter culture (8 log cfu/mL) with or without Lactobacillus curvatus or Pediococci acidilactici as adjunct cultures (2 log cfu/mL). Cheddar cheeses were aged at 7.2 or 10°C for 168 d. The raw milk silo, ultrafiltration unit, cheddaring belt, and cheese tower had NSLAB biofilms ranging from 2 to 4 log cfu/100cm2. The population of Lb. curvatus reached 8 log cfu/g, whereas P. acidilactici reached 7 log cfu/g of experimental Cheddar cheese in 14 d. Higher NSLAB counts were observed in the first 14 d of aging in cheese stored at 10°C compared with that stored at 7.2°C. However, microbial counts decreased more quickly in Cheddar cheeses aged at 10°C compared with 7.2°C after 28 d. In cheeses without specific adjunct cultures (Lb. curvatus or P. acidilactici), calcium lactate crystals were not observed within 168 d. However, crystals were observed after only 56 d in cheeses containing Lb. curvatus, which also had increased concentration of d(−)-lactic acid compared with control cheeses. Our research shows that low levels of contamination with certain NSLAB can result in calcium lactate crystals, regardless of lactose:protein ratio.
doi_str_mv 10.3168/jds.S0022-0302(06)72213-5
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In cheeses without specific adjunct cultures (Lb. curvatus or P. acidilactici), calcium lactate crystals were not observed within 168 d. However, crystals were observed after only 56 d in cheeses containing Lb. curvatus, which also had increased concentration of d(−)-lactic acid compared with control cheeses. 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Swabs were analyzed to determine the sources and microorganisms responsible for contamination. In pilot plant experiments, cheese vats filled with standard cheese milk (lactose:protein=1.47) and ultrafiltered cheese milk (lactose:protein=1.23) were inoculated with Lactococcus lactis ssp. cremoris starter culture (8 log cfu/mL) with or without Lactobacillus curvatus or Pediococci acidilactici as adjunct cultures (2 log cfu/mL). Cheddar cheeses were aged at 7.2 or 10°C for 168 d. The raw milk silo, ultrafiltration unit, cheddaring belt, and cheese tower had NSLAB biofilms ranging from 2 to 4 log cfu/100cm2. The population of Lb. curvatus reached 8 log cfu/g, whereas P. acidilactici reached 7 log cfu/g of experimental Cheddar cheese in 14 d. Higher NSLAB counts were observed in the first 14 d of aging in cheese stored at 10°C compared with that stored at 7.2°C. However, microbial counts decreased more quickly in Cheddar cheeses aged at 10°C compared with 7.2°C after 28 d. In cheeses without specific adjunct cultures (Lb. curvatus or P. acidilactici), calcium lactate crystals were not observed within 168 d. However, crystals were observed after only 56 d in cheeses containing Lb. curvatus, which also had increased concentration of d(−)-lactic acid compared with control cheeses. Our research shows that low levels of contamination with certain NSLAB can result in calcium lactate crystals, regardless of lactose:protein ratio.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>16606716</pmid><doi>10.3168/jds.S0022-0302(06)72213-5</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record>
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subjects Animals
biofilm
Biofilms
Calcium Compounds - analysis
Calcium Compounds - chemistry
calcium lactate crystal
Cheese - analysis
Cheese - microbiology
cheese ripening
Colony Count, Microbial
Crystallization
food contamination
Food Handling - methods
food microbiology
food quality
Hot Temperature
Lactates - analysis
Lactates - chemistry
lactic acid
Lactic Acid - analysis
Lactobacillus - growth & development
Lactobacillus curvatus
Lactococcus lactis
Lactococcus lactis - growth & development
Lactococcus lactis subsp. cremoris
Lactose - analysis
Milk - chemistry
nonstarter lactic acid bacteria
Pediococcus - growth & development
Pediococcus acidilactici
plate count
temperature
title Nonstarter Lactic Acid Bacteria Biofilms and Calcium Lactate Crystals in Cheddar Cheese
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