ABSTRACT
OBJECTIVE: To prepare hypromellose(HPMC) hollow capsules by hypromellose as raw material, adding gel, coagulant and plasticizer. METHODS: Using hypromellose and k-carrageenan as main material, the HPMC hollow capsules were prepared by sol preparing, glue keeping, sheet stamping, drying, cutting and superposition sequentially. Glue viscosity, properties, yield and water content of capsule were used as indicators to optimize formula and preparation parameters by single factor experiments and orthogonal experiments. RESULTS: The most appropriate formula and preparation conditions were as follows HPMC (E5) 16.5%, k-carrageenan 0.9%, and sol dissolving time 30 min under 90℃, glue keeping temperature 45-50℃, sheet stamping 45-50℃, drying 2-2.5 hr in condition of 35℃. CONCLUSION: The key performance indicators like apparent shape, disintegration time etc of HPMC hollow capsules meet the requirements of the national standard. The preparation is suitable for industrial production.
ABSTRACT
Plants have been used for the treatment of different diseases since 1100 BC. Catharanthus roseus is one of the medicinally important plants showing anti-tumor, anti-mutagenic and anti-microbial effects. L-asparaginase is extracted by C. roseus and is used for the development of biosensors. L-asparaginase breaks down asparagine into aspartic acid and ammonia, thus killing the tumor cells due to asparagine starvation. In the present study the L-asparaginase was extracted from C. roseus and immobilized in different matrixes such as agar, soil, clay and k-carrageenan. Out of the various immobilization techniques k-carrageenan gave the fastest response time, so it was choosen for the development of asparagine biosensor. In the leukemic blood samples the asparagine concentration was 10-2 to 10-3 M whereas in normal blood samples it was 10-5 to 10-6 M. The developed biosensor gave the fast response and were sensitive and reliable.
ABSTRACT
@#The aim of the study was to select a suitable pelletisation aid of valsartan immediate-release pellets in the extrusion process and optimized the formulation. The properties of the pellets with five excipients which were microcrystalline cellulose(MCC), low-substituted hydroxypropyl cellulose(L-HPC), crospovidone(PVPP), pregelatinized starch(PCS)and k-carrageenan were evaluated and compared by the single factor test. And the pelletisation aids were chosen preliminary. The properties of the pellets with MCC, L-HPC, k-carrageenan respectively were evaluated and compared and k-carrageenan was determined as the most appropriate pelletisation aid. The Box-Behnken design was employed to optimize the formulation. The optimised formulation was k-carrageenan 16. 98 g, HPMC-E5 2. 03 g, SLS 0. 26 g. The yield and aspect ratio of pellets was 91. 23% and 1. 14, respectively. And there was no significant difference between observed and predictive responses. The results showed k-carrageenan pellets owned properties of a high yield, acceptable sphericity and fast drug release.