Relationship between freezing point and raw ewes’ milk components as a possible tool for estimation
Result description
Milk adulteration with added water (MAAW) is controlled by freezing point depression (FPD) determination. The goal was to evaluate the suitability an alternative method for FPD equivalent (FPD-E) measurement and to estimate the basis for FPD cut-off value (to identify MAAW) for sheep´s milk. Raw bulk sheep´s milk samples (BSMSs; n = 811) were analysed for FPD, FPD-E and composition in 2014. The mean FPD of BSMSs was -0.559 ± 0.029 °C. The FPD cut-off value can be in the range close to -0.511 °C (mean + standard deviation x 1.64, one-sided 95% confidence interval). Influence of season and lactation was significant for all milk indicators. 89.4% of the variability in the FPD-E can be explained by variations in FPD. The total correlation coefficient was 0.945 (P < 0.001) and high correlation was also in FPD interval > -0.511 °C: 0.992, P < 0.001. High correlations between FPD and milk components: -0.228, -0.231, -0.219 (P < 0.01), -0.497 and -0.341 (P < 0.001) for fat, protein, lactose, solids not fat and total solids is the explanation. Determination of FPD-E in sheep´s milk can be an effective tool for estimation of MAAW.
Keywords
raw sheep´s milkfreezing point depressionmid-infrared analysis with Fourier transformation
The result's identifiers
Result code in IS VaVaI
Result on the web
http://www.vup.sk/en/index.php?mainID=2&navID=34&version=2&volume=54&article=1982
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Relationship between freezing point and raw ewes’ milk components as a possible tool for estimation
Original language description
Milk adulteration with added water (MAAW) is controlled by freezing point depression (FPD) determination. The goal was to evaluate the suitability an alternative method for FPD equivalent (FPD-E) measurement and to estimate the basis for FPD cut-off value (to identify MAAW) for sheep´s milk. Raw bulk sheep´s milk samples (BSMSs; n = 811) were analysed for FPD, FPD-E and composition in 2014. The mean FPD of BSMSs was -0.559 ± 0.029 °C. The FPD cut-off value can be in the range close to -0.511 °C (mean + standard deviation x 1.64, one-sided 95% confidence interval). Influence of season and lactation was significant for all milk indicators. 89.4% of the variability in the FPD-E can be explained by variations in FPD. The total correlation coefficient was 0.945 (P < 0.001) and high correlation was also in FPD interval > -0.511 °C: 0.992, P < 0.001. High correlations between FPD and milk components: -0.228, -0.231, -0.219 (P < 0.01), -0.497 and -0.341 (P < 0.001) for fat, protein, lactose, solids not fat and total solids is the explanation. Determination of FPD-E in sheep´s milk can be an effective tool for estimation of MAAW.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
GM - Food industry
OECD FORD branch
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Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Food and Nutrition Research
ISSN
1336-8672
e-ISSN
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Volume of the periodical
54
Issue of the periodical within the volume
4
Country of publishing house
SK - SLOVAKIA
Number of pages
8
Pages from-to
281-288
UT code for WoS article
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EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
GM - Food industry
Year of implementation
2015