## STP FOR ALBENDAZOLE TABLETS

1.0)    Description: Visual

2.0)     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.

Tablets were weighed individually and the percentage of deviation of its weight from the average weight was determined for each tablet. Formula for calculate the percentage of deviation = (experimental weight – theoretical weight)    x 100%

Theoretical weight

 Average weight of tablets Percentage deviation More than 80mg but Less than 250mg 7.5% 250mg or More 5%

4.0)      Identification Test:

1. Determine by thin-layer chromatography, coating the plate with cellulose F 254.

Mobile phase: A mixture of 60 volumes of chloroform, 10 volumes of ether and 10 volumes of glacial acetic acid.

Test solution: Disperse a quantity of the powdered tablets containing 200mg of albendazole in 20ml of a mixture of 18 volumes of chloroform and 1 volumes of formic acid, warm the suspension on a water bath for 15 minutes, cool and filter. Dilute 10ml of the filtrate with an equal volume of glacial acetic acid.

Reference solution: A 0.5 per cent w/v solution of albendazole reference standard in glacial acetic acid.

Apply to the plate 10 µl of each solution. After development, dry the plate in a current of warm air and examine under ultraviolet light at 254nm. The principal spot in the chromatogram obtained with the test solution corresponds to that in the chromatogram obtained with the reference solution.

1. Extract a quantity of the powdered tablets containing 100mg of albendazole with 100ml of 0.1 M methanolic HCl, filter and dilute 1ml of the filtrate to 100ml with 0.1 M Sodium hydroxide. The absorbance of the resulting solution at the maximum at about 309nm is about 0.74.

5.0)      Hardness:

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

8.0)      Friability:

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)      Dissolution:

Medium: 900ml of 0.1 M HCl

Speed: 75 rpm

Time: 30 minutes

Limit: NLT 85% of the stated amount of Albendazole.

Withdraw a suitable volume of the medium and filter. Dilute 1ml of filtrate to 50ml with 0.1 M sodium hydroxide. Measure the absorbance of the resulting solution at the maximum at about 308nm. Calculate the content of Albendazole in the medium taking 742 as the specific absorbance at 308nm.

10.0)    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.

11.0)    Assay:

Weigh and powder 20 tablets. Weigh a quantity of the powder containing 0.1 g of albendazole, add 150ml 0.1 M methanolic HCl, shake for 15 minutes and dilute to 250ml with 0.1 M methanolic HCl, mix filter and dilute 5ml of the filtrate to 250ml with 0.1 M sodium hydroxide. Measure the absorbance of the resulting solution at maximum at about 309nm. Calculate the content of Albendazole taking 742 as the specific absorbance.

Acceptance criteria: 92.5%-107.5%

13.0)    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

Abbreviations:

Wt.: Weight

mg: Miligram

ml: Milileter

STD: Standard

inHg: Inch of Mercury

rpm: Rounds per minute

CFU: Colony forming unit

HCl: Hydrochloric acid