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A new spectrophotometric method for improved indirect measurement of low levels of vitellogenin using malachite green

Hallgren, Pär; Mårtensson, Lennart and Mathiasson, Lennart LU (2012) In International Journal of Environmental Analytical Chemistry 92(7). p.894-908
Abstract
Vitellogenin (VTG) is a well-known biomarker for endocrine disruption and the measurement of alkali-labile protein bound phosphate (ALP) has been used as an indirect quantification method for VTG in fish, clam and mussel. One limitation of the ALP method has been the insufficient detection limit but with the method presented here this obstacle has been overcome, enabling measurement in fish species with very low background levels and hence a wider usage of ALP measurements in the future. In a previous publication, relying on spectrophotometric measurement with molybdate, we presented an improved protocol for ALP measurement in fish plasma. The sample preparation in that paper has here been combined with an improved spectrophotometric... (More)
Vitellogenin (VTG) is a well-known biomarker for endocrine disruption and the measurement of alkali-labile protein bound phosphate (ALP) has been used as an indirect quantification method for VTG in fish, clam and mussel. One limitation of the ALP method has been the insufficient detection limit but with the method presented here this obstacle has been overcome, enabling measurement in fish species with very low background levels and hence a wider usage of ALP measurements in the future. In a previous publication, relying on spectrophotometric measurement with molybdate, we presented an improved protocol for ALP measurement in fish plasma. The sample preparation in that paper has here been combined with an improved spectrophotometric determination using malachite green as colour reagent. The spectrophotometric measurement was optimised with respect to acidity and reagent concentration. The validated method has a detection limit of 0.3 mu g PO43- ml(-1) plasma, which is 10 times lower than previous spectrophotometric methods using molybdate reagent, and an intra-assay variation of 7%. The new method was used for screening of endocrine effects by placing juvenile rainbow trout at three locations along the Vallkarra brook, Lund Sweden, which receives leachate water from a nearby covered landfill. In comparison with reference fish, ALP was significantly higher (66%) at the 99% confidence level in fish placed close to the landfill. ALP was also significantly higher (33%) at the 95% confidence level in fish from the group placed further downstream. Fish placed in a brook branch not receiving leachate were unaffected. The low levels of ALP in reference fish (5.5 +/- 0.7 SD PO43- mu g/ml plasma) could not have been quantified with such precision with another method for ALP measurement. The indirect quantification of VTG as ALP is a more economic alternative compared to quantification with immunological methods. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
vitellogenin, alkali-labile phosphate, endocrine disruptors, biomarker, malachite green, Oncorhynchus mykiss
in
International Journal of Environmental Analytical Chemistry
volume
92
issue
7
pages
894 - 908
publisher
Taylor & Francis
external identifiers
  • wos:000304039300010
  • scopus:84861510539
ISSN
1029-0397
DOI
10.1080/03067319.2010.496051
language
English
LU publication?
yes
id
633ca4c4-78a2-47b5-8100-d707c4c95ccf (old id 2826355)
date added to LUP
2012-06-21 09:07:42
date last changed
2017-07-30 03:26:48
@article{633ca4c4-78a2-47b5-8100-d707c4c95ccf,
  abstract     = {Vitellogenin (VTG) is a well-known biomarker for endocrine disruption and the measurement of alkali-labile protein bound phosphate (ALP) has been used as an indirect quantification method for VTG in fish, clam and mussel. One limitation of the ALP method has been the insufficient detection limit but with the method presented here this obstacle has been overcome, enabling measurement in fish species with very low background levels and hence a wider usage of ALP measurements in the future. In a previous publication, relying on spectrophotometric measurement with molybdate, we presented an improved protocol for ALP measurement in fish plasma. The sample preparation in that paper has here been combined with an improved spectrophotometric determination using malachite green as colour reagent. The spectrophotometric measurement was optimised with respect to acidity and reagent concentration. The validated method has a detection limit of 0.3 mu g PO43- ml(-1) plasma, which is 10 times lower than previous spectrophotometric methods using molybdate reagent, and an intra-assay variation of 7%. The new method was used for screening of endocrine effects by placing juvenile rainbow trout at three locations along the Vallkarra brook, Lund Sweden, which receives leachate water from a nearby covered landfill. In comparison with reference fish, ALP was significantly higher (66%) at the 99% confidence level in fish placed close to the landfill. ALP was also significantly higher (33%) at the 95% confidence level in fish from the group placed further downstream. Fish placed in a brook branch not receiving leachate were unaffected. The low levels of ALP in reference fish (5.5 +/- 0.7 SD PO43- mu g/ml plasma) could not have been quantified with such precision with another method for ALP measurement. The indirect quantification of VTG as ALP is a more economic alternative compared to quantification with immunological methods.},
  author       = {Hallgren, Pär and Mårtensson, Lennart and Mathiasson, Lennart},
  issn         = {1029-0397},
  keyword      = {vitellogenin,alkali-labile phosphate,endocrine disruptors,biomarker,malachite green,Oncorhynchus mykiss},
  language     = {eng},
  number       = {7},
  pages        = {894--908},
  publisher    = {Taylor & Francis},
  series       = {International Journal of Environmental Analytical Chemistry},
  title        = {A new spectrophotometric method for improved indirect measurement of low levels of vitellogenin using malachite green},
  url          = {http://dx.doi.org/10.1080/03067319.2010.496051},
  volume       = {92},
  year         = {2012},
}