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Sciences Essay代写:压片压缩
2017-02-20 13:05

Sciences Essay代写:压片压缩
During tablet compression, disintegrated particles get deformed and these deformed particles get into their normal structure when they come in contact with aqueous media or water (Fig. 2). Occasionally, the swelling capacity of starch was improved when granules were extensively deformed during compression. This increase in size of the deformed particles produces a breakup of the tablet. This may be a mechanism of starch and has only recently begun to be studied. 12. better disintegrating property than the most widely used synthetic superdisintegrants like Ac-di-sol in the formulations of FDT’s. Studies indicated that the extracted mucilage is a good pharmaceutical adjuvant, specifically a disintegrating agent.18. Mango peel pectin Mango peel which constitutes 20–25% of the mango processing waste was found to be a good source for the extraction of pectin of good quality, suitable for the preparation of fiim and acceptable jelly. Pectin is a complex hetro-polysacharides which is a hydrophilic colloid. Malviya et al (2011) investigated that mango peel pectin stand as a good candidate as superdisintegrant though, not as stronger as synthetic superdisintegrant but due to its good solubility and higher swelling index, it may be used in the formulation of fast dispersible tablets.19-20 Agar and treated agar Agar is the dried gelatinous substance obtained from Gelidium amansii (Gelidanceae) and several other species of red algae like Gracilaria ( Gracilariaceae) and Pterocadia (Gelidaceae). Agar is yellowish gray or white to nearly colorless, odorless with mucilaginous taste and is available in the form of strips, sheet flakes or coarse powder. Agar consists of two polysaccharides as agarose and agaropectin. Agarose is responsible for gel strength and Agaropectin is responsible for the viscosity of agar solutions. High gel strength of agar makes it a potential candidate as a disintegrant. Guar gum Guar gum is mainly consisting of the high molecular weight (approximately 50,000-8,000,000) polysaccharides composed of galactomannans and is obtained from the endosperm of the seed of the guar plant, Cyamopsis tetragonaloba (L) Taub. (syn. Cyamopsis psoraloides). It is used as thickener, stabilizer and emulsifier, and approved in most areas of the world (e.g. EU, USA, Japan, and Australia. It is naturally occurring gum (marketed under the trade name jaguar). It is free flowing, completely soluble, neutral polymer composed of sugar units and is approved for use in food. It is not sensitive to pH, moisture contents or solubility of the tablet matrix. It is not always pure white and sometimes varies in color from off-white to tan tends to discolor with time in alkaline tablets.21 Gellan gum Gellan gum is a water-soluble polysaccharide produced by Pseudomonas elodea, a bacterium. Gellan gum is an anionic, high molecular weight, deacetylated exocellular polysaccharide gum produced as a fermentation product by a pure culture of Pseudomonas elodea2, with a tetrasaccharide repeating unit of one α-L-rhamnose, one β-D-glucuronic acid and two β-D-glucose residues. Antony et al 1997 studied the Gellan gum as a disintegrant and the efficiency of gum was compared with other conventional disintegrants such as dried corn starch, explotab, avicel (pH 10.2), Ac-di-sol. and Kollidon CL. The disintegration of tablet might be due to the instantaneous swelling characteristics of gellan gum when it comes into contact with water and owing to its high hydrophilic nature. The complete disintegration of tablet was has proved itself as superior disintegrant.22
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