Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life
ABSTRACT: There is a large and growing market for natural sweeteners with low glycemic index. Of particular interest are the “rare sugars” (e.g., d-tagatose). Rare sugars could be applied in dairy foods, such as yogurt, as sucrose replacements. Yogurt contains live and active cultures and, consequen...
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| Language: | English |
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Elsevier
2025-04-01
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| Series: | Journal of Dairy Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0022030225000384 |
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| author | Kate Sorensen Zeynep Atamer Joy Waite-Cusic |
| author_facet | Kate Sorensen Zeynep Atamer Joy Waite-Cusic |
| author_sort | Kate Sorensen |
| collection | DOAJ |
| description | ABSTRACT: There is a large and growing market for natural sweeteners with low glycemic index. Of particular interest are the “rare sugars” (e.g., d-tagatose). Rare sugars could be applied in dairy foods, such as yogurt, as sucrose replacements. Yogurt contains live and active cultures and, consequently, their enzymes. These enzymes include those capable of sugar hydrolysis or isomerization, which could undermine the nutritional benefits of rare sugars. The purpose of this research was to evaluate sugar stability and influence of added sugars during storage of commercial nonfat Greek yogurts having simple and complex microbial compositions. Two commercial nonfat Greek yogurt products with different bacterial profiles (simple: Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus; complex: S. thermophilus, L. delbrueckii ssp. bulgaricus, Bifidobacterium lactis, Lactobacillus acidophilus, and Lacticaseibacillus rhamnosus) were supplemented with sugars (fructose, galactose, glucose, lactose, sucrose, and d-tagatose) at 10% (wt/wt) in duplicate and sampled every 2 wk. Individual sugar concentrations and lactic acid were measured using a combination of enzyme kits (Megazyme) and high-performance liquid chromatography. Sugar (lactose, glucose, galactose) and lactic acid isomer concentrations were significantly different between the 2 commercial products, but neither product changed significantly during refrigerated storage. Each added sugar (10%) was stable throughout the 6-wk refrigerated storage period. The pH of all yogurts decreased slightly (−0.1 pH) during storage, but with no corresponding change in lactic acid concentration. These results provide foundational data on the stability of various sugars in cultured dairy products throughout refrigerated shelf life. |
| format | Article |
| id | doaj-art-9fa08f7ec10b4fe598fe25f69d36fe5c |
| institution | OA Journals |
| issn | 0022-0302 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Dairy Science |
| spelling | doaj-art-9fa08f7ec10b4fe598fe25f69d36fe5c2025-08-20T02:11:58ZengElsevierJournal of Dairy Science0022-03022025-04-0110843247325710.3168/jds.2024-25667Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf lifeKate Sorensen0Zeynep Atamer1Joy Waite-Cusic2Department of Food Science and Technology, College of Agricultural Sciences, Oregon State University, Corvallis, OR 97331Department of Food Science and Technology, College of Agricultural Sciences, Oregon State University, Corvallis, OR 97331Corresponding author; Department of Food Science and Technology, College of Agricultural Sciences, Oregon State University, Corvallis, OR 97331ABSTRACT: There is a large and growing market for natural sweeteners with low glycemic index. Of particular interest are the “rare sugars” (e.g., d-tagatose). Rare sugars could be applied in dairy foods, such as yogurt, as sucrose replacements. Yogurt contains live and active cultures and, consequently, their enzymes. These enzymes include those capable of sugar hydrolysis or isomerization, which could undermine the nutritional benefits of rare sugars. The purpose of this research was to evaluate sugar stability and influence of added sugars during storage of commercial nonfat Greek yogurts having simple and complex microbial compositions. Two commercial nonfat Greek yogurt products with different bacterial profiles (simple: Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus; complex: S. thermophilus, L. delbrueckii ssp. bulgaricus, Bifidobacterium lactis, Lactobacillus acidophilus, and Lacticaseibacillus rhamnosus) were supplemented with sugars (fructose, galactose, glucose, lactose, sucrose, and d-tagatose) at 10% (wt/wt) in duplicate and sampled every 2 wk. Individual sugar concentrations and lactic acid were measured using a combination of enzyme kits (Megazyme) and high-performance liquid chromatography. Sugar (lactose, glucose, galactose) and lactic acid isomer concentrations were significantly different between the 2 commercial products, but neither product changed significantly during refrigerated storage. Each added sugar (10%) was stable throughout the 6-wk refrigerated storage period. The pH of all yogurts decreased slightly (−0.1 pH) during storage, but with no corresponding change in lactic acid concentration. These results provide foundational data on the stability of various sugars in cultured dairy products throughout refrigerated shelf life.http://www.sciencedirect.com/science/article/pii/S0022030225000384cultured dairy productsrare sugarslactoseshelf life |
| spellingShingle | Kate Sorensen Zeynep Atamer Joy Waite-Cusic Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life Journal of Dairy Science cultured dairy products rare sugars lactose shelf life |
| title | Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| title_full | Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| title_fullStr | Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| title_full_unstemmed | Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| title_short | Stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| title_sort | stability of sugars in yogurts with simple and complex microbial composition during refrigerated shelf life |
| topic | cultured dairy products rare sugars lactose shelf life |
| url | http://www.sciencedirect.com/science/article/pii/S0022030225000384 |
| work_keys_str_mv | AT katesorensen stabilityofsugarsinyogurtswithsimpleandcomplexmicrobialcompositionduringrefrigeratedshelflife AT zeynepatamer stabilityofsugarsinyogurtswithsimpleandcomplexmicrobialcompositionduringrefrigeratedshelflife AT joywaitecusic stabilityofsugarsinyogurtswithsimpleandcomplexmicrobialcompositionduringrefrigeratedshelflife |