ABSTRACT
Konjac glucomannan (KGM) is a water-soluble polysaccharide obtained from the roots and tubers of konjac plants. Recently, a degraded product of KGM, depolymerized KGM (DKGM), has attracted attention because of its low viscosity, improved hydrophily, and favorable physiological functions. In this review, we describe the preparation of DKGM and its prebiotic effects. Other health benefits of DKGM, covering antioxidant and immune activity, are also discussed, as well as its safety. DKGM could be a candidate for use as a tool for the treatment of various diseases, including intestinal flora imbalance, and oxidative- and immune-related disorders.
Subject(s)
Animals , Humans , Amorphophallus , Chemistry , Antioxidants , Therapeutic Uses , Hydrophobic and Hydrophilic Interactions , Immunologic Factors , Therapeutic Uses , Mannans , Therapeutic Uses , Plants, Medicinal , Chemistry , Polymerization , Prebiotics , Safety , ViscosityABSTRACT
Objective To optimize the formula of konjac glucomannan-paeonol matrix tablets. Methods The formula of paeonol matrix tablets was optimized by the orthogonal design with the accumulative release rate in vitro as index, with the viscosity of konjac glucomannan ( KGM) , the amount of KGM and lactose as influence factors. Results The optimized formula was as follows:the viscosity of konjac glucomannan was 20 000 mPa·s, KGM 30%, lactose 20% and the release in vitro fit into the Higuchi equation. Conclusion The formula of the paeonol matrix tablets is reasonable and the tablets have well release effect in vitro.
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OBJECTIVE: To study the influence of konjac glucomannan (KGM) on properties of superporous hydrogel (SPH).
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Objective To study the formulation and preparation factors influencing in vitro release mechanism of drug from?-carrageenan/konjac glucomannan hydrophilic matrix tablets.Methods The matrix tablets containing sinomenine hydrochloride as a model drug were obtained by direct compression method or wet granulation technique.The effects of the ratios of?-carrageenan/konjac glucomannan,the amount of matrix materials,the kinds of diluent agent,tablet size,preparation method,and compressing pressure on release mechanism of the matrix tablets were studied by evaluating the n value in the Peppas equation. Results The release mechanism of the matrix tablets was non-Fickian release that coupled diffusion and erosion modle.With a decrease in the ratio of?-carrageenan/konjac glucomannan,a decrease in the amount of matrix materials,a decrease in the water-solubility of diluent agents,an increase in tablet size,and a decrease in compressing pressure,the ratio of drug diffusion was increased.Preparation method had little influence on drug release mechanism.Conclusion Drug could be slowly released from the matrix tablets containing?-carrageenan/konjac glucomannan as matrix material,the main factors influencing drug release mechanism are the ratio of?-carrageenan/konjac glucomannan,the amount of matrix materials, the kinds of diluent agent,tablet size,and compressing pressure.
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AIM: The drug release characteristics of ?-carrageenan/konjac glucomannan matrix tablet were elvated by in vitro dissolution experiment. METHODS: Sinomenine hydrochloride was used as model drug,the matrix tablet containing ?-carrageenan and konjac glucomannan as matrix material were prepared by wet granulation technique. Drug release and tablet erosion in different pH values,ionic strength of media and rotation speeds were studied by in vitro dissolution experiment. The data of drug release and matrix tablet erosion were confirmed in Peppas and zero order equation,respectively. RESULTS: Among the rate of drug release in different media,0. 1 mol/L HCl was the fastest,distilled water was the second,pH6. 8 PBS was the slowest. The rate of drug release decreased with increasing the ionic strength of media(P 0. 1). The rate of drug release increased with increasing the rotation speeds(P
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AIM:To study the effects of pH and ionic strength of release media on in vitro berberine hydrochloride(BH)released from carboxymethyl konjac glucomannan(CMKGM)pellets and to evaluate its characteristics.METHODS:The CMKGM pellets were prepared by ionotropic gelation with BH as the model drug.In vitro drug release,dynamic swelling and erosion percent of the pellets were studied respectively in release media with different pH(pH 1.0、pH 5.0、pH 6.8、 pH 7.4)or different ionic strength(pH 6.8 PBS with 2、4、6、8 g/L NaCl).The amount of BH released were confirmed in different equation to evaluate BH release mechanism of the pellets.RESULTS:With the increased of pH value or the decreased of ionic strength of the release media,the swelling ratio and erosion percent of the pellets increased,the BH release rate increased.The release of BH in HCl solution was film-controlled and exhibited zero order kinetic equation;the release of BH in PBS was non-Fickian release that coupled diffusion and erosion of the pellets matrix,exhibited Peppas equation.CONCLUSION:The swelling ratio and erosion percent of CMKGM pellets is related to pH and ionic strength of the release media,which influence BH released and release mechanism of the pellets.
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AIM: To evaluate colon-oriented delivery characteristics of berberine hydrochloricde(BH) containing carboxymethyl konjac glucomannan(CMKGM) pellets. METHODS: BH-containing CMKGM pellets(pellets group) and BH-containing carboxymethyl cellulose suspension(control group) were intragastric administrated to rats at the dose of 50 mg/kg,respectively.Blood samples were obtained from the rat femoral artery,the gastric、entric、cecal、colonic tissues and their contents sampled at a given interval to measure the concentration of BH by HPLC.The bar charts of relative content of BH in different parts of the gastrointestinal tract and theirs contents were drawn.Drug delivery index(DDI) was calculated. RESULTS: Compared with the control group,the concentration and distribution of BH in gastric、enteric tissue and their contents decreased significantly,but in cecal、colonic tissue and their contents less at first,and more than the control group after 2～6 h.The DDI values of the pellets to gastric,enteric,cecal,colonic tissue and their contents were 0.392 4,0.478 6,3.916,4.193,(0.162 8,)0.619 4,3.843,4.087 against the control group,respectively. CONCLUSION: CMKGM pellets may be a useful colon-specific drug delivery system for BH.