20. Enteric Coating Polymers Polymer Characteristics Cellulose Acetate Phthalate Susceptible to Hydrolysis Cellulose Acetate Trimellitate Susceptible to Hydrolysis Polyvinyl Acetate Phthalate Susceptible to Hydrolysis HPMC-Phthalate Susceptible to Hydrolysis HPMC-Acetate Succinate Susceptible to Hydrolysis Poly (MA -EA) 1 : 1 ------ Poly (MA -MMA) 1 : 1 High Dissolution pH Poly (MA -MMA) 1 : 2 High Dissolution pH
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23. Commercially available enteric coating systems Product Polymer Form Characteristic Eudragit L30D Poly (MA-EA) 1:1 Latex Dispersion Essentially contains only polymer Eudragit L 10055 Poly (MA-EA) 1:1 Spray Dried latex Dispersed in water + allkali Coateric PVAP Dry powder Dispersed in water + ammonia Aquateric CAP Spray dried pseudo latex Dispersed in water CAP CAP Dry powder Dissolved in water + alkali CAT CAT Dry powder Dissolved in water + alkali HPMC-P HPMC Dry powder Dispersed in water
25. Eudragits Eudragits Availability applications Dissolution properties Eudragit L 100-55 Powder Drug delivery in duodenum > 5.5 Eudragit D 100-55 Aqueous dispersion 30% Drug delivery duodenum >5.5 Eudragit L 100 Powder Drug delivery in jejunum >6.0 Eudragit S 100 Powder Drug delivery in ileum >7.0 Eudragit FS 30 D Aqueous Dispersion 30% drug delivery in colons. >7.0
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28. Release profile Influence of method of manufacture on the release of 5-ASA from Eudragit L100-55 tablets in 0.1 N HCl dissolution media (pH 1.2). () HME tablet; (■) compressed tablet with hardness value of 62 ± 2 N; (○) compressed tablet with hardness value of 230 N ± 12 N.
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34. Thank us “If we knew what we were doing, it would not be called research”