Specification Sheet
Product Name Poly-L-aspartic acid sodium salt,
mol wt 15,000-50,000
Product Number P6762
Product Brand SIGMA
CAS Number 31871-95-1
 
TEST SPECIFICATION
APPEARANCE WHITE TO OFF-WHITE POWDER
SOLUBILITY CLEAR COLORLESS TO FAINT YELLOW SOLUTION AT 50MG/ML OF WATER
WATER BY KARL FISCHER < OR = 3%
CARBON * 27.7% TO 38.6% CARBON
NITROGEN * 7.4% TO 11.0% NITROGEN
ICP-ATOMIC EMISSION * 13.3% TO 17.2% SODIUM
SPECIFIC ROTATION -15.0 TO -28.2 (C = 1 IN WATER AT 25 DEG C)
DEGREE OF POLYMERIZATION BY VISCOSITY 200 TO 298
MOLECULAR WEIGHT BY VISCOSITY 15,000 TO 50,000
DEGREE OF POLYMERI- ZATION BY MALLS 156 TO 222
MOL WT BY MULTI ANGLE LASER LIGHT SCATTERING 8,100 TO 44,500
PURITY BY THIN LAYER CHROMATOGRAPHY (UNHYDROLYZED) > OR = 98.0%
PURITY BY THIN LAYER CHROMATOGRAPHY (HYDROLYZED) > OR = 95.0%
RECOMMENDED RETEST 3 YEARS
DOCUMENT # P6762/09/23/08/5