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In order to test the redispersibility of the suspensions, the shaking intensity of the apparatus was adjusted to match the 25th percentile of the population of subjects, in whom acceleration profiles had been measured .Before sampling, containers were shaken for 3 s at 4.2 Hz with an amplitude of 5 cm. Estolate Oral Suspension, USP. It is used to prepare a diluted suspension, emulsion, or solution of the active ingredient(s) for the prevention and treatment of ectoparasitic infestations of animals. The content of active ingredient of single doses of a suspension depends to a large extent upon the redispersibility of the product. The test consisted of manually shaking the cylinder after the sedimentation experi-ments were completed. Supernatant Redispersibility Sediment Rheology Viscosity Suspension Boundary Velocity of sedimentation Sedimented In accordance with USP’s Rules and Procedures of the Council of Experts (“Rules”) and except as provided in Section 7.02 Accelerated Revision Processes, USP publishes proposed revisions to the United States Pharmacopeia and the National Formulary (USP–NF) for public review and comment in Shaking intensity. Density Specific gravity or density of the suspension is an important parameter. June 1, 2016 . USP 39–NF 34, Second Supplement . 2.2. Determination of the redispersibility The redispersibility of a suspension was evalu-ated qualitatively. Mathematical and technical aspects of a procedure to test this property have been discussed in a preceding article. Here, the method is applied to three commercial ery … Hydrometers are used to measure the density. ... suspension will be either pseudoplastic or plastic & it is desirable that thixotropy be associated with these two types of flow. ... if we allow 1% variation(as per USP) in dolevered media for 900 ml it range should be 891-909 ml , other thing you have to introduce only about 5-10 ml .not 50 or 100 ml 03-01-2007, 02:34 PM #4. 24. I have a lot of question around the dissolution test for oral suspension. Decrease in density indicates the presence of entrapped air with in the structure of the suspension. E.E.S. Both liquid products require refrigeration to preserve taste until dispensed. 400 ® LIQUID (erythromycin ethylsuccinate oral suspension, USP) is supplied in 1 pint bottles (NDC 0074-6373-16) and in 100-mL bottles (NDC 0074-6373-13). Mathematical and technical aspects of a procedure to test this property have been discussed in a preceding article. The content of active ingredient of single doses of a suspension depends to a large extent upon the redispersibility of the product. Fixed volume of each suspension (50 ml) was kept in calibrated tubes which were stored at room temperature for various time intervals (1, 5, 10, 15, 20, 30, 45 days). In the third part, indexes based on the test in this study were proposed to evaluate the sedimentation stability and redispersibility. As for MR suspensions, we prepare samples with different additives which have been reported applied most commonly in traditional MR suspensions [ 23 – 26 ]. 5.3. Based on the time and the effort required to convert the sediment to homoge-nous suspension, the formulations were evaluated. Redispersibility . I have no experience with this dosage form before. 1 UNITS 2S (USP34) Table 1. Where, Hu is ultimate or final height of sediment as suspension settles, Ho is original height of suspension. 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