Description
Specifications Table
Product Name – Diphenylamine LR
Quantity/Pack Size – 250 g
Form – Crystalline Powder
Grade – Laboratory Reagent (LR)
Application – Sugar detection, nitrite analysis, DNA visualization, redox indicator
Product Overview
Diphenylamine LR is a versatile laboratory reagent widely recognized for its role in qualitative chemical analysis. This high-purity (99%+) compound appears as colorless to pale yellow crystalline powder, exhibiting excellent solubility in organic solvents like ethanol and glacial acetic acid while remaining sparingly soluble in water. Its molecular structure (C₁₂H₁₁N) enables strong redox properties, making it particularly effective in colorimetric tests where it forms characteristic blue-violet complexes upon oxidation. The reagent demonstrates exceptional stability under standard lab conditions when stored away from direct light and moisture, with a melting point range of 52-54°C that ensures consistent performance across various analytical protocols. Its low volatility and minimal hygroscopicity contribute to extended shelf life, while the LR grade certification guarantees freedom from interfering impurities that could compromise test accuracy. The compound’s sensitivity to trace amounts of oxidizing agents allows for detection limits in the parts-per-million range, making it invaluable for precise analytical applications where conventional indicators may fail to provide sufficient sensitivity.
FAQs
1. What is the exact chemical formula and molecular weight of Diphenylamine LR?
The chemical formula is C₁₂H₁₁N with a molecular weight of 169.22 g/mol. This composition contributes to its specific reactivity patterns in analytical tests.
2. How should Diphenylamine LR be stored to maintain its shelf life?
Store in a tightly sealed amber glass container at room temperature (15-25°C), protected from light and moisture. Under these conditions, the reagent maintains stability for 24-36 months from manufacture date.
3. What solvents provide optimal solubility for Diphenylamine LR?
The reagent shows excellent solubility in ethanol (50 mg/mL), glacial acetic acid (30 mg/mL), and acetone (40 mg/mL). For aqueous solutions, adding 1-2 drops of concentrated HCl improves solubility to about 0.1 mg/mL.
4. What safety precautions are necessary when handling Diphenylamine LR?
Use nitrile gloves and safety goggles as the compound may cause skin irritation. Work in a fume hood when preparing solutions, as vapor inhalation can cause respiratory discomfort. The LD50 (oral, rat) is 1200 mg/kg.
5. What alternative reagents can replace Diphenylamine LR in sugar detection tests?
For qualitative sugar tests, alternatives include Benedict’s solution (for reducing sugars) or Fehling’s solution, though these require heating. Diphenylamine offers room-temperature detection with higher sensitivity for specific sugar types.
