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o-Phthalaldehyde [for HPLC Labeling]
(CAS RN:643-79-8 Product Number:P0280)


Synonym Benzene-1,2-dicarboxaldehyde
Synonym Phthaldialdehyde

General Information

Product Number P0280

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Purity/Analysis Method >99.0%(GC)
Storage Temperature
M.F. / M.W. C8H6O2=134.13
CAS RN 643-79-8
Related CAS RN
MDL Number MFCD00003335
Packaging and Container
  • Product Details
  • Safety & Regulations


Appearance Light yellow to Yellow to Green powder to crystal
Purity(GC) min. 99.0 %
Melting point 55.0 to 58.0 deg-C
Effect test of HPLC derivatization to pass test

Data of Reference

bp 84°C/0.8mmHg(lit.)


Beilstein 7,674
Reaxys-RN 878317
PubChem SID 87574516
Merck Index(14) 7368
RTECS# TH6950000
EC Number 211-402-2


Signal Word Danger
Hazard Statements
  • H301
  • :Toxic if swallowed.
  • H315
  • :Causes skin irritation.
  • H317
  • :May cause an allergic skin reaction.
  • H319
  • :Causes serious eye irritation.
Precautionary Statements
  • P261
  • :Avoid breathing dust/fume/gas/mist/vapours/spray.
  • P270
  • :Do not eat, drink or smoke when using this product.
  • P280
  • :Wear protective gloves, eye protection.
  • P301+P310+P330
  • :IF SWALLOWED: Immediately call a POISON CENTER or doctor. Rinse mouth.
  • P302+P352+P333+P313+P362+P364
  • :IF ON SKIN: Wash with plenty of soap and water. If skin irritation or rash occurs: Take off contaminated clothing. And wash it before reuse.
  • P305+P351+P338+P337+P313
  • :IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice or attention.

Transport Information

UN Number 2811
Class 6.1
Packing Group III
HS Number 2912290090


Fluorescence Derivatization Reagent for Primary Amines

Typical Procedure: 5-10 μL aliquots of amino acid standards or unknown samples are mixed with 5 μL of a solution prepared by dissolving of o-phthalaldehyde (50 mg) in absolute MeOH (1.25 mL) followed by the addition of 2-mercaptoethanol (50 μL) and 0.4 M sodium borate (pH 9.5) (11.2 mL). After 1 min, 0.1 M sodium acetate (pH 7.0) (20-100 μL) are added, the solution mixed and a 20-μL sample is subjected to analysis.


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