RESUMO
A novel biodegradable film was fabricated by incorporating bacterial nanocellulose stabilized valerian root extract (VRE) Pickering emulsion into karaya gum with better antioxidant and antibacterial properties for lamb meat preservation. The valerian root extract Pickering emulsion (VPE) exhibited 98 ± 1.84 % encapsulating efficiency and excellent physical stability with an average particle size of 274.6 nm. The incorporation of VPE-5 into the film matrix increased its elongation at break (EAB), and improved water resistance and barrier properties against oxygen, water vapor, and UV light. Moreover, the antioxidant and anti-bacterial properties against S.aerous and E. coli were also improved based on VPE-5 concentration. The SEM images showed a uniform distribution of VPE-5 while FTIR and XRD revealed its compatibility with karaya gum, which improved its thermal stability. The active films showed a significant preservative effect by reducing the pH, total volatile basic nitrogen (TVB-N), thiobarbituric acid reactive substances (TBARS), and total viable count (TVC) value of lamb meat and maintained its texture and color during the storage period of 9 days at 4 °C. These results demonstrated the inclusion of VPE-5 into Karaya gum was a promising technique and offers a great potential application as a bioactive material in food packaging.
Assuntos
Celulose , Emulsões , Embalagem de Alimentos , Conservação de Alimentos , Goma de Karaya , Extratos Vegetais , Raízes de Plantas , Valeriana , Celulose/química , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Conservação de Alimentos/métodos , Raízes de Plantas/química , Embalagem de Alimentos/métodos , Animais , Valeriana/química , Goma de Karaya/química , Antioxidantes/farmacologia , Antioxidantes/química , Antibacterianos/farmacologia , Antibacterianos/química , Ovinos , Carne Vermelha/análise , Carne Vermelha/microbiologia , Escherichia coli/efeitos dos fármacosRESUMO
The release of organic dyes into water systems, mainly textile industries, poses a significant threat to human and animal health. This approach shows great potential for effectively removing harmful dyes and microorganisms from wastewater treatment for environmental remediation. This study utilized gum karaya polymer bio-reductant to synthesize manganese oxide (MnO2) nanoparticles through a green approach. The synthesized MnO2 nanoparticles were characterized and confirmed by various analytical techniques. These results revealed their nanoscale dimensions, morphology, chemical purity, crystal nature, decolorized intermediate, and band gap. The photocatalytic degradation of hazardous Congo red and methyl orange dyes using KRG-MnO2 nanoparticles under visible light irradiation. Furthermore, the results demonstrated that Congo red dye degradation efficiency of 93.34 % was achieved. The dye concentration (8 to 16 mg/L), pH concentration, and radical trapping were studied. This suggests that holes and hydroxyl radicals play a crucial role in degrading the Congo red dye and demonstrate superior recyclability after three successive cycles and good stability. The possible intermediates from the Congo red dye degradation were identified through LC-MS analysis. The polymer composite MnO2 NPs have displayed notable antibacterial activity against pathogenic bacteria such as Staphylococcus aureus and Escherichia coli. The research indicates that MnO2 nanoparticles functionalized with polymers can efficiently remove pathogens and organic dyes from diverse industrial water treatment processes.
Assuntos
Antibacterianos , Corantes , Vermelho Congo , Goma de Karaya , Compostos de Manganês , Nanopartículas , Óxidos , Compostos de Manganês/química , Óxidos/química , Antibacterianos/farmacologia , Antibacterianos/química , Corantes/química , Catálise , Vermelho Congo/química , Nanopartículas/química , Goma de Karaya/química , Química Verde , Compostos Azo/química , Staphylococcus aureus/efeitos dos fármacos , Poluentes Químicos da Água/química , Escherichia coli/efeitos dos fármacos , Purificação da Água/métodos , Luz , FotóliseRESUMO
Recently, various advancements have been made in the development of functional polymeric materials for innovative applications. Herein this work, functionalization of sterculia gum (SG) was carried out via grafting of poly(2-(methacryloyloxy) ethyltrimethylammonium chloride) (METAC)-polyvinyl pyrrolidone (PVP) to develop hydrogel dressings as a platform for use in drug delivery (DD). The innovation of the present work is the exploration of inherent antioxidant and antimicrobial properties of the SG along with antimicrobial characteristic of poly(METAC) and PVP, to design the doxycycline encapsulated hydrogel dressings for better wound healing. FESEM, EDS and AFM analyzed the surface morphology of hydrogels. FTIR, 13C NMR and XRD inferred inclusion of poly(METAC)-PVP into polymers. 13C NMR confirmed the incorporation of poly(METAC) and PVP onto gum by the presence of a peak at 54.74 ppm because of methyl carbon attached to quaternary nitrogen of poly(METAC) and at 45.48 ppm due to the ring carbon of PVP along with FTIR peak at 949 cm-1 because of CN bending of quaternary nitrogen of poy (METAC). Thermal characterization of copolymers has been performed using TGA analysis. One gram of copolymeric hydrogel dressing absorbed 6.51 ± 0.03 g simulated salivary fluid (SSF) and 7.65 ± 0.03 g simulated wound fluid (SWF). Release of doxycycline drug occurred in a sustained manner and followed the Non-Fickian diffusion mechanism from hydrogels. The release profile was most effectively described by Hixon-Crowell kinetic model. Hydrogel demonstrated biocompatibility and expressed thrombogenicity 79.7 ± 4.9 % during its polymer-blood interactions. Copolymer revealed mucoadhesive property, requiring a force of 77.00 ± 0.01 mN to detach from bio-membrane. Additionally, it exhibited antioxidant features, showing 43.81 ± 0.286 % free radical scavenging. Hydrogel dressings were mechanically stable and revealed 0.76 ± 0.09 N mm-2 tensile strength and 9.18 ± 0.01 N burst strength. Polymer films were permeable to oxygen and water vapor and were impermeable to microorganisms. Hydrogel dressings exhibited antimicrobial properties against Pseudomonas aeruginosa and Staphylococcus aureus bacteria. Overall, these properties displayed the suitability of hydrogels for wound dressing (WD) applications which may actively enhance wound healing.
Assuntos
Anti-Infecciosos , Sterculia , Hidrogéis/química , Sterculia/química , Doxiciclina , Antioxidantes/farmacologia , Antioxidantes/química , Goma de Karaya/química , Polímeros/química , Povidona , Carbono , Nitrogênio , Antibacterianos/farmacologia , Antibacterianos/químicaRESUMO
Hazardous effluents from textile industries being major contributors of water pollution and impose potential adverse effects on environment. In present study, Fe3O4 embedded oxidized Sterculia gum/Gelatin hybrid matrix have been fabricated and evaluated for enrichment of methyl orange (MO) and methylene blue (MB). Newly synthesized matrix was characterized through powdered XRD, FTIR, FESEM, TEM and TGA. Integrated nanoparticles improved dye enrichment and facilitated removal of matrix from the aqueous solution under the influence of magnetic field. Influence of various reaction parameters viz.: contact time, adsorbent dose, initial dye concentration, temperature & pH of the adsorption medium on dye enrichment have been evaluated. Maximum adsorption (90 % and 88 % for MO and MB respectively) has been achieved. Langmuir, Freundlich and Tempkin adsorption isotherms have been evaluated. Experimental results validate well fitted Freundlich isotherm for MO and Temkin isotherm for MB. Adsorption kinetics has been analyzed through Pseudo first order, second order kinetic and intra particle diffusion models. Adsorption of both dyes was best explained via pseudo second order kinetic model. Negative value of Gibb's free energy change (-26.487 KJ mol -1 and - 24.262 KJ mol -1) for MB and MO at 303 K was an indication of spontaneity of the reaction.
Assuntos
Sterculia , Poluentes Químicos da Água , Corantes/química , Gelatina , Adsorção , Poluentes Químicos da Água/química , Goma de Karaya , Cinética , Azul de Metileno/química , Concentração de Íons de HidrogênioRESUMO
Thiolation of polymers is one of the most appropriate approaches to impart higher mechanical strength and mucoadhesion. Thiol modification of gum karaya and gum acacia was carried out by esterification with 80% thioglycolic acid. FTIR, DSC and XRD confirmed the completion of thiolation reaction. Anticancer potential of developed thiomer was studied on cervical cancer cell lines (HeLa) and more than 60% of human cervical cell lines (HeLa) were inhibited at concentration of 5 µg/100 µL. Immobilized thiol groups were found to be 0.8511 mmol/g as determined by Ellman's method. Cytotoxicity studies on L929 fibroblast cell lines indicated thiomers were biocompatible. Bilayered tablets were prepared using Ivabradine hydrochloride as the model drug and synthesized thiolated gums as mucoadhesive polymer. Tablets prepared using thiolated polymers in combination showed more swelling, mucoadhesion and residence time as compared to unmodified gums. Thiol modification controlled the release of the drug for 24 h and enhanced permeation of the drug up to 3 fold through porcine buccal mucosa as compared to tablets with unmodified gums. Thiolated polymer showed increased mucoadhesion and permeation, anticancer potential, controlled release and thus can be utilized as a novel excipient in formulation development.
Assuntos
Acacia , Goma de Karaya , Suínos , Humanos , Animais , Excipientes , Preparações de Ação Retardada , Goma Arábica , Ivabradina , Comprimidos , Compostos de Sulfidrila , Polímeros , Sistemas de Liberação de MedicamentosRESUMO
The effect of weakly charged insoluble karaya gum (KG) on zein colloidal nanoparticles (ZKGPs) for stabilizing Pickering emulsions was investigated. Due to weak surface charge, KG could cover the surface of zein particles by hydrogen bonds and weak electrostatic interactions. With the increase in coverage, the zeta potential of ZKGPs changed from positive to negative values close to zero and the average particle size tended to become larger. The closest neutral wettability (89.85°) was achieved when the zein/KG mass ratio was 1:1. The samples prepared with high oil volume fraction (φ = 0.5-0.75) and high particle concentration (1.0-1.3 %, w/v) formed emulsion gels easily and showed higher storage stability. CLSM images also confirmed that ZKGPs could be distributed in the continuous phase to enhance the emulsion network structure. Consequently, weakly charged ZKGPs reduced the emulsification energy barrier and increased the coverage and steric hindrance of particles at the oil/water interface. These findings provide new ideas for the development of stable Pickering emulsions for application in food textural modification as well as encapsulation and delivery of bioactive substances.
Assuntos
Nanopartículas , Zeína , Zeína/química , Emulsões/química , Goma de Karaya , Nanopartículas/química , Tamanho da PartículaRESUMO
The study investigates the use of fiber carriers, based on biopolymeric gums as potential candidates for cosmetic and dermatological applications, in particular for skin regeneration. Gum arabic (GA), xanthan gum (XA), and gum karaya (GK) were used as the main gum materials for the fibers, which were prepared by centrifugal spinning from an aqueous solution. These solutions of different mass gum ratios were blended with poly (ethylene oxide) (PEO) for better spinnability. Finally, vitamins E and C were added to selected solutions of gums. The resulting fibers were extensively investigated. The morphology and structure of all fibers were investigated by scanning electron microscopy and Fourier transformed infrared spectroscopy. Most importantly, they were characterized by the release of vitamin E loaded in the fibers using UV-VIS spectroscopy. The presentation will show that the newly prepared fibers from GA and PEO represent a very promising material for cosmetic and dermatologic applications.
Assuntos
Goma de Karaya , Vitaminas , Goma Arábica/química , Goma de Karaya/química , Polietilenoglicóis , Regeneração , PeleRESUMO
In this work, we tailor facile hydrogels nanocomposite (HNC) based on sustainable karaya gum for water treatment. Karaya gum crosslink poly(acrylamide-co-acrylonitrile) @ silver nanoparticle (KG-cl-P(AAm-co-AN)@AgNPs) HNC were made by an aqueous free radical in situ crosslink copolymerization of acrylamide (AAm) and acrylic acid (AA) in aqueous solution of KG-stabilized AgNPs. FTIR, XRD, DTA-TGA, SEM, and TEM were used to characterize HNC. The hydrogels' swelling, diffusion, and network characteristics were investigated. The removal efficiency of HNC was found to be 99% at pH 8 for a crystal violet (CV), dose of 0.02 g after 1 h. Dye adsorption by these hydrogels was also investigated in terms of isotherms, and kinetics. The dye's exceptionally high adsorption capacity on HNC for CV removal is explained by H-bonding interactions, as well as dipole-dipole and electrostatic interactions between anionic adsorbent and cationic dye molecules (Qmax, 1000 mg/g). The HNC can be regenerated with 0.1 M HCl and reused at least 10 times maintaining over 68% dye removal. The loading of AgNPs into the polymeric matrix of KG-cl-P(AAm-co-AN) significantly increases the removal percentage of CV dye from its aqueous solution, according to this study.
Assuntos
Acrilonitrila , Poluentes Ambientais , Nanopartículas Metálicas , Poluentes Químicos da Água , Acrilamidas/química , Adsorção , Violeta Genciana , Hidrogéis/química , Concentração de Íons de Hidrogênio , Goma de Karaya , Cinética , Prata , Poluentes Químicos da Água/químicaRESUMO
Presented research aimed to develop a spray drying process without the use of organic solvents for the preparation of novel Karaya gum polymer microparticles (MPs) of Ganoderma lucidum polysaccharide (GLP). The prepared microparticles were characterized and evaluated. Prepared novel karaya gum micro-particles loaded Ganoderma lucidum polysaccharide (GLP MPs) were observed an effect on cadmium (CAD) induced testicular toxicity. A total of 40 rats (male) was divided into 4 groups viz. 1. Control group, 2. GLP MPs (250 mg/kg, 60 days of b.w per day), 3. CAD (60 days of 30 mg/l/day), 4. GLP MPs + CAD. CAD was responsible for altering the sex hormones, oxidative stress and inflammatory cytokines. Furthermore, elevated levels of indicator of oxidative stress, malondialdehyde, and a reduced action of SOD, GSH, and CAT (antioxidant enzymes), were observed in the tissues of the testicles of CAD- treated group. Such harmful occurrences were followed by an up-regulation in proinflammatory cytokines (TNF-α, IL-1ß) levels, protein expression of Nrf2, and HO-1 expression was decreased. GLP MPs pre-treatment significantly abrogated these toxic effects which were confirmed histologically. This study concluded that pre-treatment with GLP MPs exerts a protective effect against CAD-induced male reproductive testicular toxicity.
Assuntos
Cádmio/toxicidade , Citocinas/metabolismo , Polissacarídeos Fúngicos/química , Hormônios Esteroides Gonadais/metabolismo , Mediadores da Inflamação/metabolismo , Goma de Karaya/química , Estresse Oxidativo , Animais , Fenômenos Químicos , Portadores de Fármacos , Polissacarídeos Fúngicos/administração & dosagem , Peroxidação de Lipídeos , Masculino , Ratos , Análise EspectralRESUMO
Gum karaya is a polysaccharide that has several industrial applications in the pharmaceutical, food, and environmental fields owing to its hydrophilic, anionic, and biocompatible nature. Gum karaya and its modified forms have been assessed for drug delivery, wastewater treatment, and food industry applications. This review provides a comprehensive overview of various synthetic methods of modification of gum karaya, such as grafting initiated through free radical, microwave-assisted grafting, radiation-assisted, and enzyme-assisted modification methods. In addition, the review outlines collective industrial applications of modified gum karaya in drug delivery systems, removal of heavy atoms, dyes, food, and other biological activities, and suggests possible prospects for gum karaya modification and their remarkable industrial applications.
Assuntos
Portadores de Fármacos/química , Desenho de Fármacos , Goma de Karaya/química , Polissacarídeos/química , Purificação da Água/métodos , Adsorção , Animais , Anti-Infecciosos/farmacologia , Antineoplásicos/farmacologia , Química Farmacêutica/métodos , Corantes/isolamento & purificação , Sistemas de Liberação de Medicamentos , Radicais Livres , Humanos , Hidrogéis/química , Concentração de Íons de Hidrogênio , Íons , Metais/química , Metais Pesados/isolamento & purificação , Micro-Ondas , Polímeros/químicaRESUMO
This research was focused to develop novel karaya gum films, modified by adding Schisandra chinensis oil and its oleogel. The films produced were assessed for physicochemical, mechanical, thermal and structural characteristics. Glass transition temperature (Tg) of control karaya gum films was recorded as 145.70 °C. Insignificant (p < 0.05) changes occurred in Tg of films in which oil was incorporated, irrespective of the concentration. However, Tg decreased significantly (p < 0.05) as oleogel was added to the karaya gum films and lowest Tg occurred for the KGOG3 films which contained highest concentration of oleogel. X-ray diffraction test depicted an obsolete amorphous behavior of control karaya gum film whereas some peaks appeared in other film samples. Scanning electron micrography (SEM) revealed a reduction in roughness and grainy morphology when oil or oleogel was added to the films. Addition of oil/oleogel enhanced the phenolic content and DPPH radical scavenging activity of the films.
Assuntos
Goma de Karaya/química , Óleos de Plantas/química , Schisandra/química , Compostos Orgânicos/química , Permeabilidade , Temperatura de Transição , Difração de Raios XRESUMO
Natural polysaccharides have been investigated as vehicles for oral insulin administration. Because of their non-toxic, renewable, low cost and readily available properties, gums find multiple applications in the pharmaceutical industry. This work aimed to develop a Sterculia striata gum-based formulation associated with additional biopolymers (dextran sulfate, chitosan, and albumin), a crosslinking agent (calcium chloride) and stabilizing agents (polyethylene glycol and poloxamer 188), to increase the oral bioavailability of proteins. Insulin was used as a model drug and the methods used to prepare the formulation were based on ionotropic pregelation followed by electrolytic complexation of oppositely charged biopolymers under controlled pH conditions. The developed formulation was characterized to validate its efficacy, by the determination of its average particle size (622 nm), the insulin encapsulation efficiency (70%), stability in storage for 30 days, and the in vitro mucoadhesion strength (92.46 mN). Additionally, the developed formulation preserved about 64% of initial insulin dose in a simulated gastric medium. This study proposed, for the first time, a Sterculia striata gum-based insulin delivery system with potential for the oral administration of protein drugs, being considered a valid alternative for efficient delivery of those drugs.
Assuntos
Goma de Karaya/química , Preparações Farmacêuticas/química , Proteínas/química , Sterculia/química , Administração Oral , Disponibilidade Biológica , Biopolímeros/química , Cloreto de Cálcio/química , Portadores de Fármacos/química , Sistemas de Liberação de Medicamentos/métodos , Liberação Controlada de Fármacos , Insulina/química , Tamanho da Partícula , Poloxâmero/química , Polietilenoglicóis/químicaRESUMO
This study undertakes the development of colloidal carriers for the purpose of oral delivery of bosentan and subsequent management of systemic hypertension. Karaya gum, a natural polymer was carboxymethylated to improve its hydrophilic character and then the carboxymethyl gum was hydrophobically modified by forming propyl ethers. The modified polymer acquired amphiphilic property and self-aggregated in water to form amphiphilic colloidal particles (ACPs) at critical concentration of 3.35 mg/L with spherical shape (<200 nm) and smooth surface morphology. The colloidal particles could entrap >90% drug in the lipophilic domain. The ionic crosslinking of the hydrophilic shell of ACPs imparted greater stability to the colloidal system. The crosslinking extended the duration of drug release under simulated gastrointestinal fluids. The crystalline drug physically turned into amorphous state after hosting into the lipophilic cores of ACPs. The entrapment resulted in significant improvement of drug dissolution rate. The polymer relaxation contributed to the diffusion process of drug from ACPs. Pre-clinical testing via oral route demonstrated that the crosslinked colloidal particles could effectively control the systemic hypertension over a period of 12 h. Hence, bosentan-loaded self-assembled colloidal particles may advance the management of systemic hypertension.
Assuntos
Hipertensão/tratamento farmacológico , Goma de Karaya/química , Difusão , Portadores de Fármacos/química , Liberação Controlada de Fármacos , Hipertensão/metabolismo , Polímeros/química , SolubilidadeRESUMO
Sterculia gums, as karaya and chicha gum, are complex branched and polydisperse heteropolysaccharides which can have their applications extended by improving their characteristics through chemical modifications. The objective of this work was to increase the antimicrobial activity of karaya and chicha gum through chemical modification with maleic anhydride. The incorporation of anhydride in the gum structure was confirmed by the characterization techniques. The derived biopolymers were synthesized and characterized by FTIR, X-ray diffraction, Thermogravimetric analysis and elemental analysis. Antimicrobial activity was evaluated against the Staphylococcus aureus strain (ATCC 25923). Mammalian cytotoxicity assays were also performed by MTT and hemolysis tests. The derivatives showed excellent antibacterial action inhibiting almost 100% of bacterial growth and did not present significant cytotoxicity in mammalian cells. The results showed that the derivatives are promising for biomedical applications aiming the control of infectious diseases caused by S. aureus.
Assuntos
Antibacterianos/farmacologia , Anidridos Maleicos/química , Gomas Vegetais/farmacologia , Sterculia/química , Animais , Antibacterianos/química , Feminino , Goma de Karaya/química , Goma de Karaya/farmacologia , Masculino , Camundongos , Testes de Sensibilidade Microbiana , Viabilidade Microbiana/efeitos dos fármacos , Gomas Vegetais/química , Espectroscopia de Infravermelho com Transformada de Fourier , Staphylococcus aureus/efeitos dos fármacos , Staphylococcus aureus/crescimento & desenvolvimento , Termogravimetria , Testes de Toxicidade , Difração de Raios XRESUMO
A polymer-clay hybrid composite material, (KG-g-PMETAC/MMT) has been synthesised by microwave assisted free radical polymerisation using modified karaya gum and clay mineral and was characterised by various techniques. The karaya gum has been modified by grafting with (2-methacryloyloxy ethyl) trimethyl ammonium chloride prior to making the clay composite. Montmorillonite was used as the clay component. The nanocomposite exhibited pH responsive swelling behaviour. The maximum swelling of 42.23 g/g was observed at pH 7.0 and minimum of 17.28 g/g was noticed at pH 9.2. The water transport mechanism was Fickian in nature and followed second order kinetic model. The adsorption capacities of the nanocomposite for the chosen cationic dyes, methylene blue (MB), toluidine blue (TB), crystal violet (CV) and azure B (AB) were found to 155.85, 149.64, 137.77 and 128.78 mg/g respectively. The dye adsorption was found to be a pseudo-first order kinetic process. The adsorption data is found to best fit with Freundlich isotherm model indicating heterogeneous adsorption and possibility of multilayer formation. Negative value of ΔG indicated the spontaneous nature of adsorption process at the temperatures under study. The reusability studies indicated that desorption of about 70% of the adsorbed dyes can be achieved after two consecutive cycles.
Assuntos
Bentonita/química , Corantes/química , Goma de Karaya/química , Nanocompostos/química , Poluentes Químicos da Água/química , Adsorção , Micro-Ondas , Purificação da ÁguaRESUMO
The present work deals with the design of the alginate, sterculia gum polysaccharide and PVP based hydrogel for brain drug delivery applications. The release dynamics of citicoline drug, a nerve regenerating agent, was evaluated. The polymers were investigated by Cryo-SEMs, AFM, FTIR, XRD, 13C NMR, and swelling studies. The drug release occurred slowly without burst effect and followed mechanism that was approaching the Fickian diffusion mechanism and first order kinetic model. The polymer matrix showed drug loading 40.0 ± 0.8%, thrombose percentage 68.70 ± 8.95%, hemolytic index value 3.66 ± 1.65%, detachment force from the intestinal mucosa = 0.124 ± 0.04 N, and tensile strength 7.67 ± 0.40 N/mm2. These films were found biocompatible, antioxidant and mucoadhesive and could be explored for brain drug delivery.
Assuntos
Alginatos/química , Encéfalo/metabolismo , Hidrogéis/química , Goma de Karaya/química , Sterculia/química , Difusão , Sistemas de Liberação de Medicamentos/métodos , Liberação Controlada de Fármacos/efeitos dos fármacos , Concentração de Íons de Hidrogênio , Polimerização/efeitos dos fármacos , Polímeros/química , Polissacarídeos/química , Termogravimetria/métodosRESUMO
Flowers-like ZnO structures were synthesized using Arabic Gum (AGZnO) or Karaya Gum (KGZnO). The AGZnO and KGZnO were characterized by X-ray diffractometry, Fourier Transformed Infrared, Scanning Electron Microscopy, Photoluminescence, nitrogen adsorption/desorption and diffuse reflectance techniques. The materials were tested in the discoloration of Methylene Blue (MB) dye under visible light and scavenger studies were also performed. The toxicity of the MB irradiated was investigated in bioassays with Artemia salina. The structural characterization demonstrated the formation of hexagonal ZnO. All samples presented flower-like morphology with presence of mesopores identified by BET method. The optical properties indicated band gap of 2.99 (AGZnO) and 2.76 eV (KGZnO), and emission in violet, blue and green emissions also were observed. The KGZnO demonstrated better photocatalytic performance than the AGZnO, and scavenger studies indicated that OH radicals are the main species involved in the degradation of the pollutant model. The photodiscoloration of MB solution did not demonstrate toxicity. Therefore, KGZnO is a promising material for photocatalysis application.
Assuntos
Artemia/crescimento & desenvolvimento , Goma Arábica/química , Goma de Karaya/química , Azul de Metileno/análise , Óxido de Zinco/química , Adsorção , Animais , Artemia/efeitos dos fármacos , Catálise , Química Verde , Luz , Teste de Materiais , Microscopia Eletrônica de Varredura , Estrutura Molecular , Fotólise , Difração de Raios X , Óxido de Zinco/farmacologiaRESUMO
A cross-linked hydrogel was synthesized using a hybrid backbone of karaya gum starch and grafted with polyacrylic acid. It showed a maximum swelling ratio (SR) of 30.5 g/g at pH 10 and was explored as an oral drug delivery carrier using paracetamol and aspirin as model drugs. In vitro release experiments revealed that maximum drug release at pH 7.4 in comparison to pH 1.2 (simulated intestinal vs gastric fluid) and neutral medium. The release profiles of these drugs showed no initial burst. It also showed good hemocompatibilty and non-cytotoxicity for its employment as a site specific drug delivery agent.
Assuntos
Preparações de Ação Retardada/química , Hidrogéis/química , Goma de Karaya/química , Amido/química , Acetaminofen/administração & dosagem , Acetaminofen/química , Analgésicos não Narcóticos/administração & dosagem , Analgésicos não Narcóticos/química , Animais , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/química , Aspirina/administração & dosagem , Aspirina/química , Células COS , Chlorocebus aethiops , Reagentes de Ligações Cruzadas/química , Liberação Controlada de Fármacos , Humanos , Concentração de Íons de Hidrogênio , CinéticaRESUMO
The amphiphilic propyl Karaya gum (KG) with a degree of propyl group substitution of 3.24 was synthesized to design self-assembled nanogels as carriers for bosentan monohydrate, a poorly soluble antihypertensive drug. The drug was physically hosted into the hydrophobic core of the micellar nanogels by solvent evaporation method. TEM images revealed spherical shape and core-shell morphology of the nanogels. Depending upon polymer: drug weight ratio, the drug entrapment efficiency of >85% was attained. The carriers had hydrodynamic diameter in the range of 230-305 nm with narrow size distribution. The zeta potential of -23.0 to -24.9 mV and low critical association concentration (CAC) of 8.32 mg/l provided evidence that the colloidal nanogel system was physically stable. Thermodynamics of the propyl KG system in water favored spontaneous self-assembly of propyl KG. FTIR, thermal and x-ray analyses suggested that the drug was compatible in the hydrophobic confines of the nanogels. The micellar nanogels liberated their contents in simulated gastrointestinal condition in a pH-dependent manner over a period of 10 h. Peppas-Sahlin modeling of in vitro drug release data suggested that the polymer relaxation/swelling mechanism dominated the drug release process. Pre-clinical testing of the mucoadhesive nanogel formulations exhibited that the system could monitor the anti-hypertensive activity for a prolonged period. Overall, this propyl KG micellar nanogel system had a great potential and splendid outlook to serve as novel oral controlled release carriers for poorly soluble drugs with outstanding pharmacodynamics.
Assuntos
Bosentana/administração & dosagem , Sistemas de Liberação de Medicamentos , Goma de Karaya/química , Nanogéis/química , Polietilenoglicóis/química , Polietilenoimina/química , Animais , Anti-Hipertensivos/administração & dosagem , Anti-Hipertensivos/farmacologia , Anti-Hipertensivos/uso terapêutico , Bosentana/farmacologia , Bosentana/uso terapêutico , Varredura Diferencial de Calorimetria , Modelos Animais de Doenças , Liberação Controlada de Fármacos , Hipertensão/tratamento farmacológico , Goma de Karaya/síntese química , Masculino , Camundongos , Ratos Wistar , Espectroscopia de Infravermelho com Transformada de Fourier , Difração de Raios XRESUMO
This investigation was undertaken to unveil the controlled drug delivery and preclinical anti-hypertensive potential of a novel interpenetrating biopolymer-based network of karaya gum and carboxymethyl locust bean gum (CLBG). The Williamson synthesis of CLBG was confirmed after analyzing FTIR spectra, degree of O-carboxymethyl group substitution and viscosity. The hydrogel particles (HPs) were developed using aluminium chloride solution as cross-linker. A full 32 factorial design approach was adopted for the optimization of two responses: drug entrapment efficiency and drug release (%) in simulated gastrointestinal conditions at 10 h. FE-SEM images and EDX spectra supported the formation of spherical HPs and successful entrapment of the drug in the HPs. Depending upon formulation variables, the drug entrapment efficiency of the HPs lied in the range of 84-98%. The HP matrix was chemically compatible for carvedilol phosphate as was suggested by infrared, thermal and x-ray analyses. The swelling kinetics of HPs corroborated well with the pH-dependent in vitro drug discharge characteristics. The drug release from HPs was found to follow anomalous transport mechanism with varying contribution of simple diffusion and polymer relaxation as was elucidated by Peppas-Sahlin model equation. Preclinical data suggested that the optimized HPs had an excellent blood pressure lowering activity in male Swiss albino mice up to 10 h.