High levels of cell-free DNA(cfDNA)induce psoriasis.Currently,the treatment of psoriasis has the disadvantages of penetration difficulty,suppression of normal immunity,and skin irritation.In this study,biguanide chito...High levels of cell-free DNA(cfDNA)induce psoriasis.Currently,the treatment of psoriasis has the disadvantages of penetration difficulty,suppression of normal immunity,and skin irritation.In this study,biguanide chitosan microneedles(BGC-MNs)were prepared to treat psoriasis by removing cfDNA from the dermis through the skin barrier.The effects of chitosan with different bisguanidine contents on DNA-binding capacity,biocompatibility,and inflammation inhibition were compared,revealing that chitosan containing 20%bisguanidine(BGC2)was found to have the best overall performance.In vitro,BGC2 effectively cleared cfDNA and inhibited the production of inflammatory factors.BGC-MN made from BGC2 had good mechanical and solubility properties.In vivo,BGC-MNs cleared cfDNA,reduced the level of inflammatory factors in the dermis,and exerted a good therapeutic effect on mice with psoriasis.These results suggested that BGC-MNs provided a new approach to treating psoriasis in terms of scavenging cfDNA and exerting anti-inflammatory effects.展开更多
Vaginitis is one of the most recurrent conditions that afflict women and require medical care. Vulvovaginal candidiasis (VVC) is frequently related to vaginal carriage of Candida albicans, an opportunistic polymorphic...Vaginitis is one of the most recurrent conditions that afflict women and require medical care. Vulvovaginal candidiasis (VVC) is frequently related to vaginal carriage of Candida albicans, an opportunistic polymorphic fungus, which colonizes the human skin, the mucosa and the reproductive tract. Actually, standard treatments to counteract vaginitis include several topical and oral treatments. The aim of this study was to evaluate the efficacy of a new biguanide compound, polyhexamethylene biguanide (PHMB) in avaginal solution, in women affected by vaginal candidiasis. For this reason, 40 women showing the symptoms previously ascribed to vaginal candidiasis were recruited and treated with a single PHMB dose of vaginal solution. After a single dose of treatment, 80% of them had a complete resolution of the fungal infection;furthermore, all of them reported clinical benefits, statistically significant reduction in both clinical signs and symptoms of candidiasis and a score’s reduction of 50%.展开更多
A rapid and simple method for the determination of potyhexamethylene biguanide （polyhexanide, PHMB） in liquid and gel-like pharmaceutical formulations by means of high performance liquid chromatography coupled to di...A rapid and simple method for the determination of potyhexamethylene biguanide （polyhexanide, PHMB） in liquid and gel-like pharmaceutical formulations by means of high performance liquid chromatography coupled to diode-array detection （HPLC DAD） was devel- oped. Best separation was achieved using a cyanopropyl bonded phase （Agilent Zorbax Eclipse XDB-CN column 4.6mm x 75 mm with particle size of 3.5 μm） as well as gradient elution consisting of acetonitrile/deionized water at a flow rate of 1.0 mL/min. The optimized and applied chromatographic conditions permitted separation of polyhexanide from interacting raatrix with subsequent detection at a wavelength of 235 nm with good sensitivity. The method validation was carried out with regard to the guidelines for analytical procedures demanded by the International Conference on Harmonisation （ICH）. Mean recoveries of 102% and 101% for gel-like as well as liquid preparations were obtained. Suitable repeatability as well as intermediate precision could bc achieved with limits of detection ≤0.004 mg/mL for both formulations, equivalent to ≤0.004% PHMB concerning sample preparation. Determination of PHMB was accomplished without tedious sample preparation. Interacting matrix could be eliminated by the chromatographicprocedure with excellent performance of system suitability. All analytical requirements were fulfilled permitting a reliable and precise determination of PHMB in pharmaceuticals. Further- more, the developed method was applied to stability testing of pharmaceutical preparations containing PHMB.展开更多
Background:Hard-to-heal wounds are often compromised by the presence of biofilm.This presents an infection risk,yet traditional antimicrobial wound care products and systemic antibiotics are often used despite the unc...Background:Hard-to-heal wounds are often compromised by the presence of biofilm.This presents an infection risk,yet traditional antimicrobial wound care products and systemic antibiotics are often used despite the uncertainty of therapeutic success and wound progression.The aim of this study was to investigate the clinical impact of a next-generation anti-biofilm Hydrofiber wound dressing(AQUACEL Ag+Extra[AQAg+E])in hard-to-heal wounds that had previously been treated unsuccessfully with traditional silver-,iodine-or polyhexamethylene biguanide(PHMB)-containing dressings and products and/or systemic antibiotics.Methods:Clinical case study evaluations of the anti-biofilm dressing were conducted,where deteriorating or stagnant wounds were selected by clinicians and primary dressings were replaced by the anti-biofilm dressing for up to 4 weeks,or as deemed clinically appropriate,with monitoring via case report forms.The data was stratified for cases where traditional silver-,iodine-or PHMBcontaining products,or systemic antibiotics,had been used prior to the introduction of the antibiofilm dressing.Results:Sixty-five cases were identified for inclusion,wounds ranging in duration from 1 week to 20 years(median:12 months).In 47(72%)cases the wounds were stagnant,while 15(23%)were deteriorating;3 wounds were not recorded.After an average of 4.2 weeks of management with the anti-biofilm dressing(range:1–11 weeks),in 11(17%)cases the wounds had healed(i.e.complete wound closure),40(62%)wounds improved,9(14%)wounds remained the same and 5(8%)wounds deteriorated.Conclusions:The introduction of this anti-biofilm dressing into protocols of care that had previously involved wound management with traditional antimicrobial products and/or antibiotics was shown to facilitate improvements in the healing status of most of these hard-to-heal wounds.Dressings containing proven anti-biofilm technology,in combination with antimicrobial silver and exudate management technology,appear to be an effective alternative to traditional anti展开更多
In this study,we used citric acid(CA)as a crosslinking agent,mixed with polyhexamethylene biguanide,to perform a pad-dry-cure treatment on wool fabrics to study its antimicrobial effects and physical properties.
Low-dimensional hybrid lead-halide perovskites with broadband white-light emission upon near-UV excitation have attracted immense scientific interest due to their potential application for the next generation of solid...Low-dimensional hybrid lead-halide perovskites with broadband white-light emission upon near-UV excitation have attracted immense scientific interest due to their potential application for the next generation of solid-state lighting as well as scintillators for radiation detection.Recently,broadband emission material is mostly reported in structural distorted perovskites.However,it is still unclear how to generate structural distortion in low-dimensional perovskites.展开更多
基金supported by National Key R&D Program of China(Grant number 2021YFB3800900)National Natural Science Foundation of China(Grant numbers 52073013,22122501,52221006 and 52161145410)+1 种基金Beijing Outstanding Young Scientist Program(No.BJJWZYJH01201910010024)approved by the Ethical Committee of Chinese Academy of Medical Sciences(CAMS).
文摘High levels of cell-free DNA(cfDNA)induce psoriasis.Currently,the treatment of psoriasis has the disadvantages of penetration difficulty,suppression of normal immunity,and skin irritation.In this study,biguanide chitosan microneedles(BGC-MNs)were prepared to treat psoriasis by removing cfDNA from the dermis through the skin barrier.The effects of chitosan with different bisguanidine contents on DNA-binding capacity,biocompatibility,and inflammation inhibition were compared,revealing that chitosan containing 20%bisguanidine(BGC2)was found to have the best overall performance.In vitro,BGC2 effectively cleared cfDNA and inhibited the production of inflammatory factors.BGC-MN made from BGC2 had good mechanical and solubility properties.In vivo,BGC-MNs cleared cfDNA,reduced the level of inflammatory factors in the dermis,and exerted a good therapeutic effect on mice with psoriasis.These results suggested that BGC-MNs provided a new approach to treating psoriasis in terms of scavenging cfDNA and exerting anti-inflammatory effects.
文摘Vaginitis is one of the most recurrent conditions that afflict women and require medical care. Vulvovaginal candidiasis (VVC) is frequently related to vaginal carriage of Candida albicans, an opportunistic polymorphic fungus, which colonizes the human skin, the mucosa and the reproductive tract. Actually, standard treatments to counteract vaginitis include several topical and oral treatments. The aim of this study was to evaluate the efficacy of a new biguanide compound, polyhexamethylene biguanide (PHMB) in avaginal solution, in women affected by vaginal candidiasis. For this reason, 40 women showing the symptoms previously ascribed to vaginal candidiasis were recruited and treated with a single PHMB dose of vaginal solution. After a single dose of treatment, 80% of them had a complete resolution of the fungal infection;furthermore, all of them reported clinical benefits, statistically significant reduction in both clinical signs and symptoms of candidiasis and a score’s reduction of 50%.
文摘A rapid and simple method for the determination of potyhexamethylene biguanide （polyhexanide, PHMB） in liquid and gel-like pharmaceutical formulations by means of high performance liquid chromatography coupled to diode-array detection （HPLC DAD） was devel- oped. Best separation was achieved using a cyanopropyl bonded phase （Agilent Zorbax Eclipse XDB-CN column 4.6mm x 75 mm with particle size of 3.5 μm） as well as gradient elution consisting of acetonitrile/deionized water at a flow rate of 1.0 mL/min. The optimized and applied chromatographic conditions permitted separation of polyhexanide from interacting raatrix with subsequent detection at a wavelength of 235 nm with good sensitivity. The method validation was carried out with regard to the guidelines for analytical procedures demanded by the International Conference on Harmonisation （ICH）. Mean recoveries of 102% and 101% for gel-like as well as liquid preparations were obtained. Suitable repeatability as well as intermediate precision could bc achieved with limits of detection ≤0.004 mg/mL for both formulations, equivalent to ≤0.004% PHMB concerning sample preparation. Determination of PHMB was accomplished without tedious sample preparation. Interacting matrix could be eliminated by the chromatographicprocedure with excellent performance of system suitability. All analytical requirements were fulfilled permitting a reliable and precise determination of PHMB in pharmaceuticals. Further- more, the developed method was applied to stability testing of pharmaceutical preparations containing PHMB.
文摘Background:Hard-to-heal wounds are often compromised by the presence of biofilm.This presents an infection risk,yet traditional antimicrobial wound care products and systemic antibiotics are often used despite the uncertainty of therapeutic success and wound progression.The aim of this study was to investigate the clinical impact of a next-generation anti-biofilm Hydrofiber wound dressing(AQUACEL Ag+Extra[AQAg+E])in hard-to-heal wounds that had previously been treated unsuccessfully with traditional silver-,iodine-or polyhexamethylene biguanide(PHMB)-containing dressings and products and/or systemic antibiotics.Methods:Clinical case study evaluations of the anti-biofilm dressing were conducted,where deteriorating or stagnant wounds were selected by clinicians and primary dressings were replaced by the anti-biofilm dressing for up to 4 weeks,or as deemed clinically appropriate,with monitoring via case report forms.The data was stratified for cases where traditional silver-,iodine-or PHMBcontaining products,or systemic antibiotics,had been used prior to the introduction of the antibiofilm dressing.Results:Sixty-five cases were identified for inclusion,wounds ranging in duration from 1 week to 20 years(median:12 months).In 47(72%)cases the wounds were stagnant,while 15(23%)were deteriorating;3 wounds were not recorded.After an average of 4.2 weeks of management with the anti-biofilm dressing(range:1–11 weeks),in 11(17%)cases the wounds had healed(i.e.complete wound closure),40(62%)wounds improved,9(14%)wounds remained the same and 5(8%)wounds deteriorated.Conclusions:The introduction of this anti-biofilm dressing into protocols of care that had previously involved wound management with traditional antimicrobial products and/or antibiotics was shown to facilitate improvements in the healing status of most of these hard-to-heal wounds.Dressings containing proven anti-biofilm technology,in combination with antimicrobial silver and exudate management technology,appear to be an effective alternative to traditional anti
文摘In this study,we used citric acid(CA)as a crosslinking agent,mixed with polyhexamethylene biguanide,to perform a pad-dry-cure treatment on wool fabrics to study its antimicrobial effects and physical properties.
基金supported by the National Natural Science Foundation of China(no.21875089).Q.D.conceived the idea,supervised the project,and conducted the initial experimentX.L.conducted most of the experiments and characterizations+3 种基金Z.Y.,C.G.,and H.L.contributed to materials design and synthesisM.H.,C.W.,and Y.S.contributed to the test of TRPLB.L.contributed to the single-crystal data and structure refinementsQ.D.and X.L wrote the paper.All authors have given approval to the final version of the manuscript.
文摘Low-dimensional hybrid lead-halide perovskites with broadband white-light emission upon near-UV excitation have attracted immense scientific interest due to their potential application for the next generation of solid-state lighting as well as scintillators for radiation detection.Recently,broadband emission material is mostly reported in structural distorted perovskites.However,it is still unclear how to generate structural distortion in low-dimensional perovskites.
