Specification Sheet
Product Name 2,5-Dihydroxybenzoic acid,
matrix substance for MALDI-MS, >99.0% (HPLC)
Product Number 85707
Product Brand SIGMA
CAS Number 490-79-9
Molecular Weight 154.12
 
TEST SPECIFICATION
APPEARANCE (COLOR) White to Faint Yellow to Faint Beige
APPEARANCE (FORM) Powder or Crystals
TITRATION (T) NAOH 0.1M 99.0 - 101.0 %
PURITY (HPLC AREA %) ≥ 99.0 %
MELTING POINT 200 - 207 C
SOLUBILITY (COLOR) Colorless to Almost Colorless
SOLUBILITY (TURBIDITY) Clear
SOLUBILITY (METHOD) 0.1G IN 10ML METHANOL
PROTON NMR SPECTRUM CONFORMS TO STRUCTURE
TEST BY UV SPECTROSCOPY CORRESPONDS TO REQUIREMENTS
METAL TRACE ANALYSIS (ICP) CORRESPONDS TO REQUIREMENTS
BARIUM (ICP) ≤ 5 mg/kg
CALCIUM (ICP) ≤ 5 mg/kg
CADMIUM (ICP) ≤ 5 mg/kg
COBALT (ICP) ≤ 5 mg/kg
CHROMIUM (ICP) ≤ 5 mg/kg
COPPER (ICP) ≤ 5 mg/kg
POTASSIUM (ICP) ≤ 5 mg/kg
MAGNESIUM (ICP) ≤ 5 mg/kg
MANGANESE (ICP) ≤ 5 mg/kg
SODIUM (ICP) ≤ 5 mg/kg
NICKEL (ICP) ≤ 5 mg/kg
LEAD (ICP) ≤ 5 mg/kg
ZINC (ICP) ≤ 5 mg/kg
RECOMMENDED RETEST PERIOD 54 MONTHS