Base de dados : MEDLINE
Pesquisa : D02.033.750 [Categoria DeCS]
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[PMID]:28450244
[Au] Autor:El-Naggar AWM; Senna MM; Mostafa TA; Helal RH
[Ad] Endereço:Radiation Chemistry Department, National Center for Radiation Research and Technology, Nasr City, Atomic Energy Authority, Cairo, Egypt. Electronic address: ab_nagga@yahoo.com.
[Ti] Título:Radiation synthesis and drug delivery properties of interpenetrating networks (IPNs) based on poly(vinyl alcohol)/ methylcellulose blend hydrogels.
[So] Source:Int J Biol Macromol;102:1045-1051, 2017 Sep.
[Is] ISSN:1879-0003
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Gamma radiation was used to prepare blend hydrogels from poly(vinyl alcohol) (PVA) and low ratios of methylcellulose (MC). The structure-property behavior was characterized by IR spectroscopy, gel fraction, differential scanning calorimetry (DSC) and swelling at room temperature and different pH values. The PVA/MC hydrogels were used as a carrier for doxycycline hyclate (DOX-h) drug. The results showed that the gel fraction of PVA/MC hydrogels decreased greatly with increasing the ratio of MC in the initial feeding solution. The PVA/MC hydrogels displayed pH-sensitive swelling character. The drug uptake-release study indicated that PVA/MC hydrogels possessed controlled release behavior and that the release process depends on pH. In this respect, the release of DOX-h drug was significant in alkaline medium.
[Mh] Termos MeSH primário: Portadores de Fármacos/química
Portadores de Fármacos/síntese química
Hidrogéis/química
Hidrogéis/síntese química
Metilcelulose/química
Álcool de Polivinil/química
[Mh] Termos MeSH secundário: Técnicas de Química Sintética
Doxiciclina/química
Liberação Controlada de Fármacos
Raios gama
Concentração de Íons de Hidrogênio
Radioquímica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Drug Carriers); 0 (Hydrogels); 9002-89-5 (Polyvinyl Alcohol); 9004-67-5 (Methylcellulose); N12000U13O (Doxycycline)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE


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[PMID]:29277008
[Au] Autor:Gavrina AI; Shirmanova MV; Aksenova NA; Yuzhakova DV; Snopova LB; Solovieva AB; Тimashev PS; Dudenkova VV; Zagaynova EV
[Ad] Endereço:Nizhny Novgorod State Medical Academy, 603005 Nizhny Novgorod, Russian Federation; Lobachevsky State University, 603000 Nizhny Novgorod, Russian Federation. Electronic address: niibmt@nizhgma.ru.
[Ti] Título:Photodynamic therapy of mouse tumor model using chlorin e6- polyvinyl alcohol complex.
[So] Source:J Photochem Photobiol B;178:614-622, 2018 Jan.
[Is] ISSN:1873-2682
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:The use of polymeric carriers to deliver hydrophobic photosensitizers has been widely discussed as a way to improve both fluorescence diagnostic and photodynamic therapy (PDT) of cancers; however, the photophysical and pharmacokinetic parameters, as well as the PDT activity, of such modifications have, until now, only been poorly investigated. The purpose of the present study was to explore the efficacy of PDT with the formulation of the photosensitizer chlorin e6 (Ce6) in combination with polyvinyl alcohol (PVA) in comparison with Ce6 alone and with the clinical drug, Photodithazine in a mouse tumor model. We also investigated the photoactivity of the Ce6-PVA in a model reaction of tryptophan oxidation, analyzed the polymer-Ce6 interaction using fluorescence spectroscopy and atomic-force microscopy, and tested the phototoxicity in vitro. Using fluorescence imaging in vivo we found that injection to mice of Ce6 in a formulation with PVA resulted in a higher tumor-to-normal ratio and greater photobleaching when compared with either the use of Ce6 alone, or with the effects of Photodithazine. Tumor growth study and histological examination of CT26 tumors revealed fast, reproducible tumor regression and more advanced necrosis after PDT with Ce6-PVA. The higher photoactivity of the Ce6-PVA complex was confirmed in a model reaction of tryptophan oxidation and in cultured cells. Therefore, encapsulation of Ce6 in PVA represents a promising strategy for further increasing the selectivity and efficacy of PDT.
[Mh] Termos MeSH primário: Fármacos Fotossensibilizantes/química
Álcool de Polivinil/química
Porfirinas/química
[Mh] Termos MeSH secundário: Animais
Linhagem Celular Tumoral
Sobrevivência Celular/efeitos dos fármacos
Modelos Animais de Doenças
Camundongos
Camundongos Endogâmicos BALB C
Microscopia de Força Atômica
Microscopia Confocal
Neoplasias/tratamento farmacológico
Neoplasias/patologia
Oxirredução
Fotoquimioterapia
Fármacos Fotossensibilizantes/uso terapêutico
Fármacos Fotossensibilizantes/toxicidade
Espécies Reativas de Oxigênio
Espectrometria de Fluorescência
Transplante Homólogo
Triptofano/química
Imagem Corporal Total
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Photosensitizing Agents); 0 (Porphyrins); 0 (Reactive Oxygen Species); 5S2CCF3T1Z (phytochlorin); 8DUH1N11BX (Tryptophan); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180212
[Lr] Data última revisão:
180212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171226
[St] Status:MEDLINE


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[PMID]:28468229
[Au] Autor:Kuzucu I; Beriat GK; Ezerarslan H; Ozdemir S; Kocaturk S
[Ad] Endereço:Department of Otolaryngology Head and Neck Surgery, Ufuk University, Ankara, Turkey.
[Ti] Título:Effects of the Autologous Platelet-Rich Plasma in Nasal Pack on Postoperative Quality of Life.
[So] Source:J Craniofac Surg;28(3):e299-e302, 2017 May.
[Is] ISSN:1536-3732
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:AIM: The authors aimed to research the effects of autologous platelet-rich plasma, which is known for the positive effects on wound healing, on postoperatif living quality of the patients after using on nasal surgery. METHODS: Patients who undergo nasal operation according to randomized patient's choice have been injected with saline merocel pack and platelet-rich plasma (PRP) in their nasal path. Postoperative is followed by 1 month; Nose Obstruction Symptom Evaluation (NOSE) scala score, bleeding, pain, and crust rate have been compared between 2 groups. RESULTS: As a result of the 1 month follow-up, it was seen that the treatment group experienced better results in terms of NOSE scale than the control group patients and this was significant difference in terms of NOSE. Less bleeding and crust was seen on the treatment group patients than the control group patients and statically significant difference was found. In terms of visual analogue scale score no statically significant difference was found between 2 groups. CONCLUSION: According to the authors' study on PRP, the authors found out that by using PRP wound can be healed faster in early period of postoperative. It was seen with the authors' research that on postoperative early period crusts, bleeding and postoperative complaints are lesser.
[Mh] Termos MeSH primário: Bandagens
Plasma Rico em Plaquetas
Cuidados Pós-Operatórios/métodos
Qualidade de Vida
Rinoplastia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Feminino
Seguimentos
Formaldeído/uso terapêutico
Hemostáticos/uso terapêutico
Seres Humanos
Masculino
Meia-Idade
Álcool de Polivinil/uso terapêutico
Cuidados Pós-Operatórios/instrumentação
Hemorragia Pós-Operatória/prevenção & controle
Período Pós-Operatório
Método Simples-Cego
Resultado do Tratamento
Cicatrização
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Hemostatics); 1HG84L3525 (Formaldehyde); 26876-25-5 (polyvinyl alcohol formaldehyde foam); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180202
[Lr] Data última revisão:
180202
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1097/SCS.0000000000003664


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[PMID]:28468504
[Au] Autor:Charron PN; Blatt SE; McKenzie C; Oldinski RA
[Ad] Endereço:Department of Mechanical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, Vermont 05405.
[Ti] Título:Dynamic mechanical response of polyvinyl alcohol-gelatin theta-gels for nucleus pulposus tissue replacement.
[So] Source:Biointerphases;12(2):02C409, 2017 05 03.
[Is] ISSN:1559-4106
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Intervertebral disk degeneration is one of the most significant contributors to low back pain. Thus, there is significant interest in designing new treatments and nucleus pulposus (NP) tissue replacements. Herein, the authors propose a biosynthetic material, comprised of a polyvinyl alcohol (PVA) and gelatin theta-gel, as an acellular NP tissue replacement. Theta-gels form during the solidification of PVA and gelatin (phase I), and the phase separation of a disklike short-chain polyethylene glycol (PEG, phase II). The PVA concentration and weight ratio of PVA to PEG were optimized, in order to achieve mechanical properties resembling NP tissue. Mechanical and material properties were analyzed for the PVA-gelatin theta-gels under static and dynamic conditions. Cyclic stress-strain testing demonstrated the theta-gels' ability to relax and perform properly under dynamic loading. Altering the molecular weight and concentration of the theta-gel constituents allows for a tunable material that can match a variety of native tissue properties.
[Mh] Termos MeSH primário: Disco Intervertebral
Álcool de Polivinil/química
Estresse Mecânico
[Mh] Termos MeSH secundário: Géis
Seres Humanos
Degeneração do Disco Intervertebral/terapia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Gels); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180201
[Lr] Data última revisão:
180201
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1116/1.4982643


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[PMID]:29172829
[Au] Autor:El Sharawy AM; Shukr MH; Elshafeey AH
[Ad] Endereço:a National Organization for Drug Control and Research (NODCAR) , Cairo , Egypt.
[Ti] Título:Formulation and optimization of duloxetine hydrochloride buccal films: in vitro and in vivo evaluation.
[So] Source:Drug Deliv;24(1):1762-1769, 2017 Nov.
[Is] ISSN:1521-0464
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Duloxetine hydrochloride (DH) is a serotonin-norepinephrine reuptake inhibitor (SSNRI) indicated for the treatment of depression. Duloxetine suffers from reduced oral bioavailability (≈50%) due to hepatic metabolism. This study aims to develop DH buccoadhesive films to improve its bioavailability. DH buccoadhesive films were prepared adopting the solvent casting method using hydroxypropyl methylcellulose (HPMC) and polyvinyl alcohol (PVA). The prepared films were evaluated for weight uniformity, drug content, surface pH, swelling index, mucoadhesion strength and drug release percentages. Accelerated stability and bioavailability studies in healthy human volunteers were also performed for the selected films. Results of the evaluation tests showed that the optimum physicochemical characters were obtained by the films prepared with 2% HPMC using 10% propylene glycol (F2 films). Accelerated stability studies revealed that DH showed proved stability throughout the experiment time. DH bioavailability from F2 films was determined and compared with that of the marketed oral capsules (Cymbalta 30 mg). The pharmacokinetic results showed that C for F2 was higher than the market product. In addition, ANOVA analysis showed that a T of F2 film was significantly lower, while, the AUC of F2 was significantly higher than that of Cymbalta capsules. The percentage relative bioavailability of DH from F2 was found to be 296.39%. Therefore, the prepared buccal films offer an alternative route for the administration of DH with the possibility of improving its bioavailability.
[Mh] Termos MeSH primário: Cloridrato de Duloxetina/química
Cloridrato de Duloxetina/metabolismo
[Mh] Termos MeSH secundário: Adesividade
Administração Bucal
Animais
Disponibilidade Biológica
Química Farmacêutica/métodos
Galinhas/metabolismo
Estudos Cross-Over
Sistemas de Liberação de Medicamentos/métodos
Liberação Controlada de Fármacos/fisiologia
Seres Humanos
Derivados da Hipromelose/química
Mucosa Bucal/metabolismo
Álcool de Polivinil/química
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
3NXW29V3WO (Hypromellose Derivatives); 9002-89-5 (Polyvinyl Alcohol); 9044SC542W (Duloxetine Hydrochloride)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180130
[Lr] Data última revisão:
180130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE
[do] DOI:10.1080/10717544.2017.1402216


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[PMID]:28873548
[Au] Autor:Ma C; Zhang W; Su Z; Bai Y
[Ad] Endereço:School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong Province 510310, China. Electronic address: mcjane2013@163.com.
[Ti] Título:Resonance Rayleigh scattering method for the determination of chitosan using erythrosine B as a probe and PVA as sensitization.
[So] Source:Food Chem;239:126-131, 2018 Jan 15.
[Is] ISSN:0308-8146
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A highly sensitive resonance Rayleigh scattering (RRS) method for the determination of chitosan (CTS) was developed. In the pH 3.8 Britton-Robinson buffer solution, CTS interacted with erythrosine B (Ery B) to form an ion-association complex of [Ery B-CTS] which increased the RRS intensity of the system. With the addition of polyvinyl alcohol (PVA), the RRS intensity was significantly enhanced, and the RRS intensity of the reagent blank(I ) dramatically decreased. The enhanced RRS intensity (ΔI) was linearly proportional to the concentration of chitosan. Taking the medium molecular weight chitosan as the representative, the linear range of the method was 5.0-100.0ng/mL and the detection limit (DL) was 0.47ng/mL. The effect of the molecular weight of CTS on its accurate quantification was studied. Furthermore the dispersion and stability mechanism of PVA was discussed. Accordingly this assay was applied to detect the concentration of CTS in health products with satisfactory results.
[Mh] Termos MeSH primário: Quitosana/análise
[Mh] Termos MeSH secundário: Eritrosina
Limite de Detecção
Álcool de Polivinil
Espalhamento de Radiação
Espectrometria de Fluorescência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9002-89-5 (Polyvinyl Alcohol); 9012-76-4 (Chitosan); PN2ZH5LOQY (Erythrosine)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171128
[Lr] Data última revisão:
171128
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170907
[St] Status:MEDLINE


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[PMID]:28885362
[Au] Autor:Chen L; Pi L; Ke N; Chen X; Liu Q
[Ad] Endereço:Department of Ophthalmology, Children's Hospital, Chongqing Medical University, Chongqing, China.
[Ti] Título:The protective efficacy and safety of bandage contact lenses in children aged 5 to 11 after frontalis muscle flap suspension for congenital blepharoptosis: A single-center randomized controlled trial.
[So] Source:Medicine (Baltimore);96(36):e8003, 2017 Sep.
[Is] ISSN:1536-5964
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Postoperative complications, lagophthalmos and exposure keratopathy sometimes occur after surgery for congenital blepharoptosis. Bandage contact lenses (BCL) can help prevent some ocular surface disorders. The study aims to evaluate the efficacy and safety of BCL for protection of the ocular surface in children aged 5 to 11 years after frontalis muscle flap suspension for congenital blepharoptosis. METHODS: We conducted a prospective randomized clinical study of 30 eyes of 30 patients with congenital blepharoptosis consecutively enrolled at the Ophthalmology Ward of the Children's Hospital of Chongqing Medical University, China from September 1, 2016, to February 30, 2017. After frontalis muscle flap suspension surgery, patients were randomly assigned to undergo BCL application (BCL group, 15 eyes) or no BCL application (control group, 15 eyes). All patients were treated with bramycin 0.3% and polyvinyl alcohol drops after surgery. The primary outcomes were dry eye assessed by tear film break time (TFBUT), fluoresce in corneal staining (FCS) on slit-lamp on days 1, 3, and 15 postoperatively, and lower tear meniscus height (LTMH) on optical coherence tomography on days 1 and 15 postoperatively. Secondary outcomes were pairwise correlation of TFBUT, FCS and LTMH. RESULTS: In the BCL group, abnormal TFBUT and FCS were only found in 2 patients (13.33%) on postoperative day 15. In the control group, the incidence of dry eye assessed by TFBUT was 67.00% (10/15 eyes) on day 1, 73.33% (11/15 eyes) on day 3, and 53.33% (8/15 eyes) on day 15 (P < .001). LTMH were significantly higher in the BCL group than the control group postoperatively (P < .001). Significant positive correlations were found between LTMH and TFBUT pre-operation and on days 1 and 15 post-operation. For LTMH and FCSS (R = -0.815, P < .001), and TFBUT and FCS (R = -0.837, P < .001), the Pearson coefficient was negative on postoperative day 1, but not correlated on day 15. CONCLUSIONS: Silicone hydrogel BCL were safe and efficacious for protective use in children after frontalis muscle flap suspension for congenital blepharoptosis.
[Mh] Termos MeSH primário: Bandagens
Blefaroptose/terapia
Lentes de Contato
Complicações Pós-Operatórias/prevenção & controle
Retalhos Cirúrgicos
[Mh] Termos MeSH secundário: Anti-Infecciosos/administração & dosagem
Blefaroptose/diagnóstico por imagem
Criança
Pré-Escolar
Síndromes do Olho Seco/diagnóstico por imagem
Síndromes do Olho Seco/prevenção & controle
Feminino
Seguimentos
Seres Humanos
Hidrogéis
Masculino
Soluções Oftálmicas
Álcool de Polivinil/administração & dosagem
Complicações Pós-Operatórias/diagnóstico por imagem
Silicones
Tomografia de Coerência Óptica
Resultado do Tratamento
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Anti-Infective Agents); 0 (Hydrogels); 0 (Ophthalmic Solutions); 0 (Silicones); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170909
[St] Status:MEDLINE
[do] DOI:10.1097/MD.0000000000008003


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[PMID]:28854241
[Au] Autor:Sobolciak P; Ali A; Hassan MK; Helal MI; Tanvir A; Popelka A; Al-Maadeed MA; Krupa I; Mahmoud KA
[Ad] Endereço:Center for Advanced Materials, Qatar University, Doha, Qatar.
[Ti] Título:2D Ti3C2Tx (MXene)-reinforced polyvinyl alcohol (PVA) nanofibers with enhanced mechanical and electrical properties.
[So] Source:PLoS One;12(8):e0183705, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Novel 2D Ti3C2Tx (MXene)-reinforced polyvinyl alcohol (PVA) nanofibers have been successfully fabricated by an electrospinning technique. The high aspect ratio, hydrophilic surfaces, and metallic conductivity of delaminated MXene nanosheet render it promising nanofiller for high performance nanocomposites. Cellulose nanocrystals (CNC) were used to improve the mechanical properties of the nanofibers. The obtained electrospun nanofibers had diameter from 174 to 194 nm depending on ratio between PVA, CNC and MXene. Dynamic mechanical analysis demonstrated an increase in the elastic modulus from 392 MPa for neat PVA fibers to 855 MPa for fibers containing CNC and MXene at 25°C. Moreover, PVA nanofibers containing 0.14 wt. % Ti3C2Tx exhibited dc conductivity of 0.8 mS/cm conductivity which is superior compared to similar composites prepared using methods other than electrospinning. Improved mechanical and electrical characteristics of the Ti3C2Tx /CNC/PVA composites make them viable materials for high performance energy applications.
[Mh] Termos MeSH primário: Condutividade Elétrica
Fenômenos Mecânicos
Nanofibras/química
Álcool de Polivinil/química
[Mh] Termos MeSH secundário: Celulose/química
Técnicas Eletroquímicas/instrumentação
Eletrodos
Microscopia de Força Atômica
Microscopia Eletrônica de Varredura
Nanocompostos/química
Nanocompostos/ultraestrutura
Nanofibras/ultraestrutura
Nanopartículas/química
Nanopartículas/ultraestrutura
Temperatura Ambiente
Termogravimetria
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9002-89-5 (Polyvinyl Alcohol); 9004-34-6 (Cellulose)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170831
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183705


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[PMID]:28800558
[Au] Autor:Martinez CM; Zhu X; Logan BE
[Ad] Endereço:Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
[Ti] Título:AQDS immobilized solid-phase redox mediators and their role during bioelectricity generation and RR2 decolorization in air-cathode single-chamber microbial fuel cells.
[So] Source:Bioelectrochemistry;118:123-130, 2017 Dec.
[Is] ISSN:1878-562X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The application of immobilized redox mediators (RMs) in microbial fuel cells (MFCs) is an emerging technology for electricity generation with simultaneous azo dye decolorization due to facilitated electrons transfer from bacteria to anodes and azo dyes. The use of immobilized RMs avoids the requirement of their continuous dosing in MFCs, which has been the main limitation for practical applications. Two strategies of anthraquinones-2,6-disulphonic salt (AQDS) immobilization, AQDS immobilized with polyvinyl alcohol particles and AQDS immobilized on anodes by electropolymerization, were evaluated and compared to achieve simultaneous reactive red 2 (RR2) dye reduction and bioelectricity generation. The AQDS immobilized by electropolymerization showed the highest power density (816±2mW/m ) and extent of RR2 decolorization (89±0.6%). This power density is one of the highest values yet achieved in the presence of a recalcitrant pollutant, suggesting that immobilization was important for enabling current generation in the presence of RR2.
[Mh] Termos MeSH primário: Ar
Antraquinonas/química
Fontes de Energia Bioelétrica
Naftalenossulfonatos/química
Triazinas/química
[Mh] Termos MeSH secundário: Cor
Condutividade Elétrica
Eletrodos
Naftalenossulfonatos/toxicidade
Oxirredução
Álcool de Polivinil/química
Triazinas/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (2,6-disulfonic acid anthraquinone); 0 (Anthraquinones); 0 (Naphthalenesulfonates); 0 (Triazines); 0 (reactive red 2); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170812
[St] Status:MEDLINE


  10 / 3919 MEDLINE  
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[PMID]:28783494
[Au] Autor:Ye B; Li Y; Chen Z; Wu QY; Wang WL; Wang T; Hu HY
[Ad] Endereço:Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, PR China.
[Ti] Título:Degradation of polyvinyl alcohol (PVA) by UV/chlorine oxidation: Radical roles, influencing factors, and degradation pathway.
[So] Source:Water Res;124:381-387, 2017 Nov 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Polyvinyl alcohol (PVA) is widely used in industry but is difficult to degrade. In this study, the synergistic effect of UV irradiation and chlorination on degradation of PVA was investigated. UV irradiation or chlorination alone did not degrade PVA. By contrast, UV/chlorine oxidation showed good efficiency for PVA degradation via generation of active free radicals, such as OH and Cl. The relative importance of these two free radicals in the oxidation process was evaluated, and it was shown that OH contributed more to PVA degradation than Cl did. The degradation of PVA followed pseudo first order kinetics. The rate constant k increased linearly from 0 min to 0.3 min with increasing chlorine dosage in range of 0 mg/L to 20 mg/L. However, when the chlorine dosage was increased above 20 mg/L, scavenging effect of free radicals occurred, and the degradation efficiency of PVA did not increase much more. Acidic media increased the degradation efficiency of PVA by UV/chlorine oxidation more than basic or neutral media because of the higher ratio of [HOCl]/[OCl ], higher free radical quantum yields, and the lower free radical quenching effect under acidic conditions. Results of Fourier Transform Infrared Spectroscopy showed that carbonyl groups in degradation products were formed during UV/chlorine oxidation, and a possible degradation pathway via alcohol to carbonyl was proposed.
[Mh] Termos MeSH primário: Álcool de Polivinil/química
Poluentes Químicos da Água/química
Purificação da Água
[Mh] Termos MeSH secundário: Cloro
Cinética
Oxirredução
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 4R7X1O2820 (Chlorine); 9002-89-5 (Polyvinyl Alcohol)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171018
[Lr] Data última revisão:
171018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170808
[St] Status:MEDLINE



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