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IBEX Sciences is a recognized scientific and laboratory equipment supplier that provides clinical diagnostics, chemicals, and educational laboratory tools. Their Albert’s Stain Kit is manufactured and distributed specifically for the microscopic diagnostic observation of Corynebacterium diphtheriae (the diphtheria bacilli). [1, 2, 3, 4, 5]
📦 IBEX Sciences Kit Features & Composition
The kit arrives as a convenient, ready-to-use biological diagnostic stain set containing two specific color-coded solution reagents: [1, 2, 3]
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- Albert’s Stain A: A clear, peacock-blue liquid formulated from certified basic dyes—Toluidine Blue O and Malachite Green—dissolved in a glacial acetic acid and ethanol base. [1, 2, 3]
- Albert’s Stain B: A clear, amber-colored stabilized iodine solution (containing iodine and potassium iodide) that acts as the necessary color-fixing mordant. [1, 2, 3, 4, 5]
🔬 Intended Diagnostic Use
The primary function of this IBEX Sciences reagent kit is to differentiate pathogenic Corynebacterium diphtheriae from non-pathogenic, standard upper respiratory flora known as diphtheroids: [1]
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- C. diphtheriae presents with highly concentrated polyphosphate deposits known as metachromatic granules (volutin granules).
- The specific acidic composition of the Toluidine Blue O binds to these granules, causing a molecular shift in color (metachromasia).
- This helps clinical microbiologists confidently view the defining “Chinese-letter” angular arrangements under a 100x oil-immersion microscope objective lens. [1, 2, 3, 4, 5]
🧪 Standard Laboratory Operating Procedure (SOP)
To ensure reliable cell staining without altering or rinsing out the primary dye targets, follow this exact protocol provided for clinical diagnostics: [1, 2]
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- Smear Preparation: Prepare a thin specimen smear (typically harvested from a Loeffler’s serum slant or blood agar) on a clean, grease-free glass slide. Air dry, then fix by gently passing through a Bunsen burner flame. [1, 2, 3]
- Primary Staining: Flood the fixed smear completely with Albert’s Stain A and let it sit undisturbed for 3 to 5 minutes. [1, 2]
- The No-Water Drain: Tilt the slide to let the excess liquid drain off. ⚠️ Do not wash the slide with water at this stage, as it will prematurely wash the malachite green away from the bacterial body protoplasm. [1, 2]
- Mordant Fixing: Immediately flood the slide with Albert’s Stain B and leave it to react for 1 minute. [1, 2]
- Final Rinse: Wash the slide gently under a slow stream of tap water, blot carefully with bibulous paper, and let it completely air dry. [1, 2, 3]
👁️ Microscopic Results & Evaluation
| Bacterial Element | Visible Appearance | Diagnostic Indication |
|---|---|---|
| Metachromatic Granules | Purple-black to dark blue-black dots | Located at the poles of the cell, forming a beaded pattern. |
| Bacterial Cytoplasm | Light green to blue-green rods | Reveals barred, distinct rod-like bacterial structures. |
If the slide reveals short, uniform green rods completely lacking the distinctive dark polar granules, the organism is highly likely to be a non-pathogenic diphtheroid commensal rather than true diphtheria. [1, 2, 3]
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