Accelerated Degradation Experiment
Conditions
Procedure A1: |
24 hours exposure at 50 °C and 100% relative humidity. |
Procedure A2: |
48 hours exposure at 50 °C and 100% relative humidity. |
Procedure A3: |
3 days exposure at 50 °C and 100% relative humidity. |
Procedure B: |
10 days exposure at 50 °C and 100% relative humidity. |
Appearance of the substance
The substance, originally in the form of a white, crystalline powder, changes after procedure A2 into a light yellow powder, after procedure A3 into a viscous yellow mass and after procedure B into a yellow-orange liquid which after cooling turns into a sticky, viscous paste.
Gain of moisture
Before exposure to heat and humidity: |
5% |
After procedure B: |
56% |
Chromatographic test
Adsorbent: Silica gel F-254
Solution applied to the plate: Substance dissolved in water.
Solvent system:
n-butanol: .............................6 volumes
acetic acid: ...........................2 volumes
water: ...................................2 volumes
Development conditions: The solvent is allowed to migrate until the front reaches a line 15 cm from the starting line.
Detection: The plate is examined under ultraviolet light at a wavelength of maximum output at about 254 nm, and then left in a chromatographic chamber containing some iodine crystals until spots appear.
Results: The spots obtained from the solution of the sample subjected to procedure B compared to the spots obtained from the reference solution of cloxacillin sodium are more intense.
Acidimetric titration
After procedure A3: |
22% degraded |
After procedure B: |
67% degraded |
Iodometric titration
After procedure A1: |
4% degraded |
After procedure A2: |
16% degraded |
After procedure A3: |
37% degraded |
After procedure B: |
94% degraded |
Conclusion
Cloxacillin sodium is subject to decomposition under accelerated degradation conditions.
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