Direct determination of selenoproteins in polyvinylidene difluoride membranes by electrothermal atomic absorption spectrometry
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Direct determination of selenoproteins in polyvinylidene difluoride membranes by electrothermal atomic absorption spectrometry. / Sidenius, U; Gammelgaard, Bente.
In: Fresenius' Journal of Analytical Chemistry, Vol. 367, No. 1, 2000, p. 96-8.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Direct determination of selenoproteins in polyvinylidene difluoride membranes by electrothermal atomic absorption spectrometry
AU - Sidenius, U
AU - Gammelgaard, Bente
PY - 2000
Y1 - 2000
N2 - A method for the direct determination of selenoproteins in plastic membranes after protein separation by gel electrophoresis was developed. Quantification was based on the determination of the selenium content of the proteins by electrothermal atomic absorption spectrometry (ET-AAS) after manual introduction of membrane pieces into the graphite furnace. The proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and subsequently transferred to a polyvinylidene difluoride (PVDF) membrane by semi-dry electroblotting. After staining the membrane, the protein bands were excised and chemical modifier was added on top of the excised membrane prior to atomic absorption measurement. Acceptable linearity was achieved in the range 2-10 ng Se, corresponding to selenium concentrations close to 1 mg/L, when aqueous solutions of selenomethionine standard as well as selenoprotein standard were applied to the membrane. A characteristic mass of 54 +/- 4 pg/0.0044 s was obtained for the selenoprotein standard. Protein transfer from polyacrylamide gel to the membrane was quantitative and no interferences were introduced. The method was used for identification of selenoprotein P after enrichment of the protein from human plasma.
AB - A method for the direct determination of selenoproteins in plastic membranes after protein separation by gel electrophoresis was developed. Quantification was based on the determination of the selenium content of the proteins by electrothermal atomic absorption spectrometry (ET-AAS) after manual introduction of membrane pieces into the graphite furnace. The proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and subsequently transferred to a polyvinylidene difluoride (PVDF) membrane by semi-dry electroblotting. After staining the membrane, the protein bands were excised and chemical modifier was added on top of the excised membrane prior to atomic absorption measurement. Acceptable linearity was achieved in the range 2-10 ng Se, corresponding to selenium concentrations close to 1 mg/L, when aqueous solutions of selenomethionine standard as well as selenoprotein standard were applied to the membrane. A characteristic mass of 54 +/- 4 pg/0.0044 s was obtained for the selenoprotein standard. Protein transfer from polyacrylamide gel to the membrane was quantitative and no interferences were introduced. The method was used for identification of selenoprotein P after enrichment of the protein from human plasma.
KW - Calibration
KW - Electrophoresis, Polyacrylamide Gel
KW - Humans
KW - Linear Models
KW - Membranes, Artificial
KW - Polyvinyls
KW - Proteins
KW - Selenoprotein P
KW - Selenoproteins
KW - Sensitivity and Specificity
KW - Spectrophotometry, Atomic
KW - Temperature
M3 - Journal article
C2 - 11227445
VL - 367
SP - 96
EP - 98
JO - Fresenius' Journal of Analytical Chemistry
JF - Fresenius' Journal of Analytical Chemistry
SN - 0937-0633
IS - 1
ER -
ID: 44053836