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Correlation between precipitation and geographical location of the δ2H values of the fatty acids in milk and bulk milk powder

Ehtesham, Emad LU ; Baisden, W. T.; Keller, E. D.; Hayman, A. R.; Van Hale, R. and Frew, R. D. (2012) In Geochimica et Cosmochimica Acta 11. p.106-116
Abstract
Hydrogen isotope ratios (δ2H) have become a tool for food traceability and authentication of agricultural products. The principle is that the isotopic composition of the produce is influenced by environmental and biological factors and hence exhibits a spatial differentiation of δ2H. This study investigates the variation in δ2H values of New Zealand milk, both in the bulk powder and individual fatty acids extracted from milk samples from dairy factories across New Zealand. Multivariate statistical analyses were used to test for relationships between δ2H of bulk milk powder, milk fatty acid and geographical location. Milk powder samples from different regions of New Zealand were found to exhibit patterns in isotopic composition similar to... (More)
Hydrogen isotope ratios (δ2H) have become a tool for food traceability and authentication of agricultural products. The principle is that the isotopic composition of the produce is influenced by environmental and biological factors and hence exhibits a spatial differentiation of δ2H. This study investigates the variation in δ2H values of New Zealand milk, both in the bulk powder and individual fatty acids extracted from milk samples from dairy factories across New Zealand. Multivariate statistical analyses were used to test for relationships between δ2H of bulk milk powder, milk fatty acid and geographical location. Milk powder samples from different regions of New Zealand were found to exhibit patterns in isotopic composition similar to the corresponding regional precipitation associated with their origin.



A model of δ2H in precipitation was developed based on measurements between 2007 and 2010 at 51 stations across New Zealand (Frew and Van Hale, 2011). The model uses multiple linear regressions to predict daily δ2H from 2 geographic and 5 rain-weighted climate variables from the 5 × 5 km New Zealand Virtual Climate Station Network (VCSN). To approximate collection radius for a drying facility the modelled values were aggregated within a 50 km radius of each dairy factory and compared to observed δ2H values of precipitation and bulk milk powder. Daily δ2H predictions for the period from August to December for the area surrounding the sample collection sites were highly correlated with the δ2H values of bulk milk powder. Therefore the δ2H value of milk fatty acids demonstrates promise as a tool for determining the provenance of milk powders and products where milk powder is an ingredient. Separation of milk powder origin to geographic sub-regions within New Zealand was achieved. Hydrogen isotope measurements could be used to complement traditional tracking systems in verifying point of origin. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Milk powder, Fatty acid, GC-C-IRMS, TC/EA, Stable isotopes, Compound specific, Hydrogen isotope, Multivariate analysis, δ2H, Precipitation, Biohydrogenation, Isoscapes
in
Geochimica et Cosmochimica Acta
volume
11
pages
106 - 116
publisher
Elsevier
external identifiers
  • scopus:84876726666
ISSN
0016-7037
DOI
10.1016/j.gca.2012.10.026
language
English
LU publication?
no
id
ff2a49a6-b8c2-408d-be37-4218d7810b6d (old id 4729277)
alternative location
http://www.sciencedirect.com/science/article/pii/S0016703712006084
date added to LUP
2014-11-07 09:05:29
date last changed
2017-06-18 03:03:18
@article{ff2a49a6-b8c2-408d-be37-4218d7810b6d,
  abstract     = {Hydrogen isotope ratios (δ2H) have become a tool for food traceability and authentication of agricultural products. The principle is that the isotopic composition of the produce is influenced by environmental and biological factors and hence exhibits a spatial differentiation of δ2H. This study investigates the variation in δ2H values of New Zealand milk, both in the bulk powder and individual fatty acids extracted from milk samples from dairy factories across New Zealand. Multivariate statistical analyses were used to test for relationships between δ2H of bulk milk powder, milk fatty acid and geographical location. Milk powder samples from different regions of New Zealand were found to exhibit patterns in isotopic composition similar to the corresponding regional precipitation associated with their origin.<br/><br>
<br/><br>
A model of δ2H in precipitation was developed based on measurements between 2007 and 2010 at 51 stations across New Zealand (Frew and Van Hale, 2011). The model uses multiple linear regressions to predict daily δ2H from 2 geographic and 5 rain-weighted climate variables from the 5 × 5 km New Zealand Virtual Climate Station Network (VCSN). To approximate collection radius for a drying facility the modelled values were aggregated within a 50 km radius of each dairy factory and compared to observed δ2H values of precipitation and bulk milk powder. Daily δ2H predictions for the period from August to December for the area surrounding the sample collection sites were highly correlated with the δ2H values of bulk milk powder. Therefore the δ2H value of milk fatty acids demonstrates promise as a tool for determining the provenance of milk powders and products where milk powder is an ingredient. Separation of milk powder origin to geographic sub-regions within New Zealand was achieved. Hydrogen isotope measurements could be used to complement traditional tracking systems in verifying point of origin.},
  author       = {Ehtesham, Emad and Baisden, W. T. and Keller, E. D. and Hayman, A. R. and Van Hale, R. and Frew, R. D.},
  issn         = {0016-7037},
  keyword      = {Milk powder,Fatty acid,GC-C-IRMS,TC/EA,Stable isotopes,Compound specific,Hydrogen isotope,Multivariate analysis,δ2H,Precipitation,Biohydrogenation,Isoscapes},
  language     = {eng},
  pages        = {106--116},
  publisher    = {Elsevier},
  series       = {Geochimica et Cosmochimica Acta},
  title        = {Correlation between precipitation and geographical location of the δ2H values of the fatty acids in milk and bulk milk powder},
  url          = {http://dx.doi.org/10.1016/j.gca.2012.10.026},
  volume       = {11},
  year         = {2012},
}