SPI-Chem Phosphotungstic Acid, CAS 12501-23-4

SPI-Chem Phosphotungstic Acid, 100g, CAS 12501-23-4
Size 100 g
Item02535-AB
AvailabilityContact for Availability
$194.65
SPI-Chem Phosphotungstic Acid, 10g, CAS 12501-23-4
Size 10 g
Item02535-BA
AvailabilityIn Stock
$25.00
Chemical Formula:H3PO4•12WO3•nH2O
CAS#:12501-23-4
Formula Weight:2880.17
RTECS #:TH5650000
Apperance:Slightly efforescent, hyroscopic crystals in the form a powder
Color:White or yellowish green
Odor:None reported
Boiling Point:Not available
Melting Point:Not available
Specific Gravity (H2O = 1):3.2
Solubility in Water:67% FSC:6810

Shipping Information

Corrosive solid, acidic, inorganic, n.o.s..
UN #:3260
Proper Shipping Name:
Hazard Class:8
Packing Group:II

PTA is a commonly used negative stain for viruses, polysaccharides, nerves, other biological issue material to be viewed by transmission electron microscopy. There have also been some so-far-as-we-know unpublished reports that PTA can be used for the staining of various nylons, a polymer apparently not readily stained by other electron dense stains. One major advantage of using PTA is that the pH can always be adjusted as desired. Some protocols also call for the use of PTA as a fixative.

For further information, see: Phosphotungstic Acid Staining of Polysaccharides Containing Structures on Epoxy Embedded Tissues, Bloom, E. E., And Aghajinian, G.K., J. Submicroscopic Cytology 11, 263 (1968).

PTA is a commonly used negative stain for viruses, polysaccharides, nerves, other biological issue material to be viewed by transmission electron microscopy. There have also been some so-far-as-we-know unpublished reports that PTA can be used for the staining of various nylons, a polymer apparently not readily stained by other electron dense stains. One major advantage of using PTA is that the pH can always be adjusted as desired. Some protocols also call for the use of PTA as a fixative.

For further information, see:
Phosphotungstic Acid Staining of Polysaccharides Containing Structures on Epoxy Embedded Tissues, Bloom, E. E., And Aghajinian, G.K., J. Submicroscopic Cytology 11, 263 (1968).

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