- Description: Visual.
- Average Weight: Check weight of 20 tablets at randomly. And calculate the average weight by formula : wt of 20 tablets (gm) x 1000 / 20. found avg. wt in mg
3.0) Uniformity of weight:
Weigh 20 tablets selected at random and calculate the average weight. Not more than two of the individual weights deviate from the average weight by more than the percentage shown in table.
Weigh the tablets individually and calculate the percentage of deviation for each tablet. By using formula = (experimental weight – theoretical weight) x 100%
|Average weight of tablets||Percentage deviation|
|More than 80mg but Less than 250mg||7.5%|
|250 mg or More||5%|
4.0) Identification Test:
In the assay the principal peak in the chromatogram obtained with the test solution corresponds to the peak in the chromatogram obtained with the reference solution.
The standard method used for tablet hardness testing is compression testing. The tablet is placed between two jaws that crush the tablet. The machine measures the force applied to the tablet and detects when it fractures. Although compressive force is applied to the tablet, along the diameter of the tablet at right angles to the applied force
6.0) Disintegration Time
Unless otherwise stated in the individual monograph, introduce one tablet into each tube and add a disc to each tube. The assembly is suspended in the liquid medium in a suitable vessel, preferably a 1-litre beaker. The volume of liquid is such that the wire mesh at its highest point is at least 15mm below the surface of the liquid, and at its lower point is at least 25mm above the bottom of the beaker. At no time should the top of the basket-rack assembly become submerged. There is a thermostatic arrangement for heating the liquid and maintaining the temperature at 37±2°.
If 1 or 2 tablets fail to disintegrate, repeat the test on 12 additional tablets; not less than 16 of the total of 18 tablets tested disintegrate.
If the tablets adhere to the disc and the preparation under examination fails to comply, repeat the test omitting the disc. The preparation complies with the test if all the tablets in the repeat test disintegrate.
7.0) Dimension of Tablet:
Length, breadth and thickness are determined by vernier in mm
The test is applicable to compressed tablets and is intended to determine the physical strength of tablets. Tablets with a unit weight equal to or less than 650 mg, take a sample of whole tablets corresponding as near as possible to 6.5g. For tablets with a unit weight of more than 650mg, take a sample of 10 whole tablets. The tablets should be carefully dedusted prior to testing. Accurately weigh the tablet sample, and place the tablets in the drum. Rotate the drum 100 times and remove the tablets. Remove any loose dust from the tablets as before, and accurately weigh.
The test is run only once unless the results are difficult to interpret or if the weight loss is greater than the target value, in which case, the test is repeated twice and the mean of the three tests is determined.
Formula: initial wt. – after friability wt. x100 / initial wt.
A maximum loss of weight (From a single test or from the mean of three tests) not greater than 1.0 percent is acceptable for most tablets.
9.0) Leak test:
The apparatus is used to test for the integrity of packed strips, blisters and Alu-Alu Blister pack containing tablets. Ensure apparatus bath is filled with purified water upto mark indicated and add 0.5% crystal violet solution in water. Samples are placed into the desiccators and the lid is placed in position. The pump starts to produce a vacuum 15inHg inside the desiccators and the vacuum is held for 1 minute. The sample remains at the required vacuum level for given time interval buzzer will sound after time is over and will cut off the vacuum pump. As the package is immersed in a colored dye solution the venting of the desiccators will allow any holes to be penetrated by the dye and the contents of the flexible packaging will also be stained with the same coloring material.
Examine all the strips for any leakage by opening the pockets manually. If anyone pocket shows evidence of leakage, reject the sample, stop the Blister / Strip machine and immediately take corrective action.
10.0) Assay: Determined by liquid chromatography.
Test preparation: Weigh and powder 20 tablets. Weigh sample containing 25mg of Deflazacort in to 100ml volumetric flask. Add 10ml of methanol HPLC grade to dissolve the sample. Dilute this upto the mark. Dilute 5ml to 25ml with same solvent. Filter and inject the sample.
Reference solution: Weigh 25mg of Deflazacort reference standard in 100ml volumetric flask. Add 10ml of methanol HPLC grade. Dilute upto the mark with mobile phase. Dilute 5ml of this solution to 25ml in mobile phase. Filter the solution and inject.
- A stainless steel column 25cm X4.6mm, packed with octadecylsilane bonded to porous silica (5µm)
- Mobile Phase: HPLC grade methanol
- Flow rate: 1.2ml per minute,
- Spectropohtometer set at 244nm,
- Injection volume: 20µl
Inject the reference solution and the test solution.
Calculate the content Deflazacort.
Area of Test STD Wt.(mg) 5 100 Potency
—————–X————–X———X—————–X———–X Average weight
Area of STD 50 50 Test Wt.(mg) 100
Alternative method: (By UV spectrophotometer)
Test solution: Weigh and powder 20 tablets. Make the solution of test containing 0.001 per cent w/v of deflazacort.
Reference solution: Weigh 25mg of deflazacort reference standard in 50ml volumetric flask. Add 10ml of methanol and dissolve the standard. Dilute upto the mark with methanol. Dilute 1ml of this solution to 50ml in methanol.
Scan the solution by UV Spectrophotometer. It will give absorbance maxima at about 242nm. Note down the reading and calculate the content of Deflazacort in tablet.
Area of Test STD Wt.(mg) 1 100 50 Potency
—————–X————–X———X—————–X——–X———–X Average weight
Area of STD 50 50 Test Wt.(mg) 5 100
Acceptance criteria: 90.0%-110.0%
11.0) MICROBIOLOGICAL PURITY
Perform the test according to requirements of IP,
Total aerobic Microbial count (TAMC): NMT 103 CFU/g
Total combined yeasts/Moulds count (TYMC): NMT 102 CFU/g
Pathogens: in 1gm drug.
Escherichia Coli – Should be absent
Pseudomonas aeroginosa – Should be absent
Salmonella – Should be absent
Staphylococcus aureus– Should be absent
W.S.: Working standard
HPLC: High performance liquid chromatography
inHg: Inch of Mercury
rpm: Rounds per minute
CFU: Colony forming unit