Pub Date : 2023-01-02DOI: 10.1080/01919512.2022.2037404
P. Shelake, D. Mohapatra, M. Tripathi, S. Giri
ABSTRACT Ozone is a powerful oxidizing agent, so its effect on quality parameters must be considered prior to any potential food application. The effect of gaseous ozone on the quality-related attributes of onion bulbs was examined. Onions were exposed to different ozone concentrations (100, 200, 300 ppm) at pulse mode (i.e., frequency of exposures 1, 2, 3). The pungency imparting pyruvic acid and ascorbic acid contents decreased with an increase in the concentration of ozone and the number of exposures, while total phenol and flavonoid content increased to an effective concentration of 400 ppm of ozone. Higher concentrations inadvertently decreased the antioxidant properties. Ozone treatment resulted in a non-significant decrease in firmness, anthocyanin content, and color of onion. Scanning electron microscopic analysis exhibited structural breakdown in the tunic (outer surface) of ozone-treated onion. At higher concentrations, structural changes were observed up to the first bulb scale.
{"title":"Explicating the effect of the ozonation on quality parameters of onion (Allium cepa L.) in terms of pungency, phenolics, antioxidant activity, colour, and microstructure","authors":"P. Shelake, D. Mohapatra, M. Tripathi, S. Giri","doi":"10.1080/01919512.2022.2037404","DOIUrl":"https://doi.org/10.1080/01919512.2022.2037404","url":null,"abstract":"ABSTRACT Ozone is a powerful oxidizing agent, so its effect on quality parameters must be considered prior to any potential food application. The effect of gaseous ozone on the quality-related attributes of onion bulbs was examined. Onions were exposed to different ozone concentrations (100, 200, 300 ppm) at pulse mode (i.e., frequency of exposures 1, 2, 3). The pungency imparting pyruvic acid and ascorbic acid contents decreased with an increase in the concentration of ozone and the number of exposures, while total phenol and flavonoid content increased to an effective concentration of 400 ppm of ozone. Higher concentrations inadvertently decreased the antioxidant properties. Ozone treatment resulted in a non-significant decrease in firmness, anthocyanin content, and color of onion. Scanning electron microscopic analysis exhibited structural breakdown in the tunic (outer surface) of ozone-treated onion. At higher concentrations, structural changes were observed up to the first bulb scale.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"1 1","pages":"75 - 88"},"PeriodicalIF":2.7,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82930417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/01919512.2022.2164251
Maycon Crispim de Oliveira Carvalho, A. B. Fernandes, H. C. Carvalho, R. Zângaro, Carlos José de Lima
ABSTRACT Endoscopes are flexible medical instruments that require a high-level disinfection protocol. This study aimed to develop a fluid-dynamic system with ozonated water to obtain high-level disinfection. A colonoscope replica with an internal flexible polytetrafluoroethylene (PTFE) tube was made. The set was then contaminated, washed, and disinfected with ozonated water. The replica was placed in a tank with a fluid-dynamic circuit. The endoscope was submerged into the tank and ozonated water was pumped through the working channel. Quantitative microbiological tests were carried out between the washing stage and disinfection in the fluid-dynamic system with ozonated water. The results indicated that the ozone concentration curve in the water from the 27- liter main tank reached the value of 0.95 mg/L after 20 minutes. No bacterial growth was detected after the replica remained in the hydrodynamic system with ozonated water for 15 minutes. The results showed that the fluid-dynamic system using ozonated water is promising as it enables high-level disinfection of the colonoscope.
{"title":"Preliminary Study: Disinfection of Colonoscope Using a Reprocessing System Based on a Hydrodynamic Model with Ozonated Water","authors":"Maycon Crispim de Oliveira Carvalho, A. B. Fernandes, H. C. Carvalho, R. Zângaro, Carlos José de Lima","doi":"10.1080/01919512.2022.2164251","DOIUrl":"https://doi.org/10.1080/01919512.2022.2164251","url":null,"abstract":"ABSTRACT Endoscopes are flexible medical instruments that require a high-level disinfection protocol. This study aimed to develop a fluid-dynamic system with ozonated water to obtain high-level disinfection. A colonoscope replica with an internal flexible polytetrafluoroethylene (PTFE) tube was made. The set was then contaminated, washed, and disinfected with ozonated water. The replica was placed in a tank with a fluid-dynamic circuit. The endoscope was submerged into the tank and ozonated water was pumped through the working channel. Quantitative microbiological tests were carried out between the washing stage and disinfection in the fluid-dynamic system with ozonated water. The results indicated that the ozone concentration curve in the water from the 27- liter main tank reached the value of 0.95 mg/L after 20 minutes. No bacterial growth was detected after the replica remained in the hydrodynamic system with ozonated water for 15 minutes. The results showed that the fluid-dynamic system using ozonated water is promising as it enables high-level disinfection of the colonoscope.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"121 1","pages":"419 - 430"},"PeriodicalIF":2.7,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79590744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1080/01919512.2022.2163224
Lobna Mansouri, Dalanda Hamdi, L. Bousselmi
ABSTRACT Cerium and europium-doped titanium nanotube (Ce and Eu-TNTs) were obtained by one-step electrochemical anodization. SEM micrographs show highly ordered nanotubes for pure- TNTs but less organized and more spaced nanotubes for Ce and Eu-TNTs. The XRD results show that anatase is the dominant phase, and the doping does not change the crystalline phase. EIS plots indicated that Ce/Eu doped TNTs photocatalysts possesses a lower electron transfer resistance than pure TNTs, which is related to an effective separation of photogenerated electron/hole pairs. The photodegradation results showed that Ce-TNTs (0.5 mM) and Eu-TNTs (2 mM) photocatalysts exhibit the best enhancement of AB removal reaching a reaction rate of (kapp = 0.026 min−1, t1/2 = 19 min) and (kapp = 0.020 min−1, t1/2 = 20 min), respectively, under initial pH = 3 and CAB = 10 mg.L−1, compared to (kapp = 0.014 min−1, t1/2 = 35 min) for pure TNTs. The adsorption efficiency carried out in the dark after 30 min is enhanced by Ce and Eu-doping and reaches its maximum to 52.08% for Eu-TNTs (2 mM) compared to only (31.11% and 32.96%), respectively, for Ce-TNTs (0.5 mM) and pure TNTs catalyst. Graphical Abstract
{"title":"Enhanced photocatalytic and photoelectrochemical investigation of Ce and Eu modified titanium nanotube arrays towards dye removal","authors":"Lobna Mansouri, Dalanda Hamdi, L. Bousselmi","doi":"10.1080/01919512.2022.2163224","DOIUrl":"https://doi.org/10.1080/01919512.2022.2163224","url":null,"abstract":"ABSTRACT Cerium and europium-doped titanium nanotube (Ce and Eu-TNTs) were obtained by one-step electrochemical anodization. SEM micrographs show highly ordered nanotubes for pure- TNTs but less organized and more spaced nanotubes for Ce and Eu-TNTs. The XRD results show that anatase is the dominant phase, and the doping does not change the crystalline phase. EIS plots indicated that Ce/Eu doped TNTs photocatalysts possesses a lower electron transfer resistance than pure TNTs, which is related to an effective separation of photogenerated electron/hole pairs. The photodegradation results showed that Ce-TNTs (0.5 mM) and Eu-TNTs (2 mM) photocatalysts exhibit the best enhancement of AB removal reaching a reaction rate of (kapp = 0.026 min−1, t1/2 = 19 min) and (kapp = 0.020 min−1, t1/2 = 20 min), respectively, under initial pH = 3 and CAB = 10 mg.L−1, compared to (kapp = 0.014 min−1, t1/2 = 35 min) for pure TNTs. The adsorption efficiency carried out in the dark after 30 min is enhanced by Ce and Eu-doping and reaches its maximum to 52.08% for Eu-TNTs (2 mM) compared to only (31.11% and 32.96%), respectively, for Ce-TNTs (0.5 mM) and pure TNTs catalyst. Graphical Abstract","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"4 1","pages":"455 - 474"},"PeriodicalIF":2.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74422227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-29DOI: 10.1080/01919512.2022.2161469
Nicholas Babcock, Nathanael La Breche, Keel Robinson, A. Pisarenko
ABSTRACT As an increasing number of potable water reuse projects consider feasibility of implementing ozonation for achieving disinfection goals and removal of trace organic compounds, bromate formation presents a practical barrier. In this study, data received from five potable water reuse facilities showed that ozone dissolution method such as fine bubble diffusion resulted in lower concentrations of bromate compared to side-stream addition. When using multipoint ozone dissolution some reduction in bromate formation was also observed. Data from these facilities displayed a positive correlation between ozone (as a function of O3:TOC ratio) and bromate formation (as molar ratio of bromide converted to bromate) with lower formation as monochloramine or hydrogen peroxide concentrations increase. This study provides an empirical model with four equations which can be used to estimate the bromate formation and the required monochloramine or hydrogen peroxide dose to achieve adequate bromate control, i.e. below MCL of 10 µg/L, if a desired O3:TOC ratio and initial bromide concentration are known. The empirical model estimates for monochloramine and hydrogen peroxide were found to be in good agreement with experimental data (R2 = 0.96 and R2 = 0.87, respectively) while within a set of boundary conditions expressed by range of concentrations of typical water quality parameters.
{"title":"Empirical Modeling of Bromate Formation and Chemical Control Strategies at Multiple Water Reuse Facilities Using Ozone","authors":"Nicholas Babcock, Nathanael La Breche, Keel Robinson, A. Pisarenko","doi":"10.1080/01919512.2022.2161469","DOIUrl":"https://doi.org/10.1080/01919512.2022.2161469","url":null,"abstract":"ABSTRACT As an increasing number of potable water reuse projects consider feasibility of implementing ozonation for achieving disinfection goals and removal of trace organic compounds, bromate formation presents a practical barrier. In this study, data received from five potable water reuse facilities showed that ozone dissolution method such as fine bubble diffusion resulted in lower concentrations of bromate compared to side-stream addition. When using multipoint ozone dissolution some reduction in bromate formation was also observed. Data from these facilities displayed a positive correlation between ozone (as a function of O3:TOC ratio) and bromate formation (as molar ratio of bromide converted to bromate) with lower formation as monochloramine or hydrogen peroxide concentrations increase. This study provides an empirical model with four equations which can be used to estimate the bromate formation and the required monochloramine or hydrogen peroxide dose to achieve adequate bromate control, i.e. below MCL of 10 µg/L, if a desired O3:TOC ratio and initial bromide concentration are known. The empirical model estimates for monochloramine and hydrogen peroxide were found to be in good agreement with experimental data (R2 = 0.96 and R2 = 0.87, respectively) while within a set of boundary conditions expressed by range of concentrations of typical water quality parameters.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"15 1","pages":"446 - 454"},"PeriodicalIF":2.7,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85282716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-26DOI: 10.1080/01919512.2022.2159320
Seyda Herguner Siso, Esin Murrja, Merve Aydemir, Ayse Sueda Al
ABSTRACT This study was performed to evaluate the effect of different decontamination protocols applied to contaminated surfaces on the recovery of adhesion. Different decontamination protocols were applied to molar teeth contaminated with blood and saliva except the control group. 40 third molar teeth were divided into groups according to the applied decontamination protocols: Group 1(control), Group 2 (water rinse), Group 3 (15-sec re-etch), Group 4 (10-sec re-etch), Group 5 (5-sec re-etch), Group 6 (5% NaOCl), Group 7 (2% chlorhexidine gluconate), Group 8 (ozonated water). Universal adhesive resin (Gluma Universal, Heraus Kulzer) was used in the etch and rinse mode according to the manufacturer’s instructions. Nanohybrid composite material was placed in all groups. Then the Shear Bond strengths of all groups were evaluated after applying 5000 thermal cycles (5–55 °C) to each sample. In the limitation of this in vitro study, it has been shown that rinsing with ozonated water of contaminated surfaces with blood and saliva after etching, has increased the micro-shear bond strength (μSBS) values more than that of in control group values. Also, the application of NaOCl, re-etching with 37% phosphoric acid for 15 seconds, and cleaning with CHX, significantly increase the bonding potential.
{"title":"Effect of Different Decontamination Protocols Applied to Blood-Saliva Contaminated Dentin Surfaces of Universal Adhesive Resin Post-Etch on Shear Bond Strength","authors":"Seyda Herguner Siso, Esin Murrja, Merve Aydemir, Ayse Sueda Al","doi":"10.1080/01919512.2022.2159320","DOIUrl":"https://doi.org/10.1080/01919512.2022.2159320","url":null,"abstract":"ABSTRACT This study was performed to evaluate the effect of different decontamination protocols applied to contaminated surfaces on the recovery of adhesion. Different decontamination protocols were applied to molar teeth contaminated with blood and saliva except the control group. 40 third molar teeth were divided into groups according to the applied decontamination protocols: Group 1(control), Group 2 (water rinse), Group 3 (15-sec re-etch), Group 4 (10-sec re-etch), Group 5 (5-sec re-etch), Group 6 (5% NaOCl), Group 7 (2% chlorhexidine gluconate), Group 8 (ozonated water). Universal adhesive resin (Gluma Universal, Heraus Kulzer) was used in the etch and rinse mode according to the manufacturer’s instructions. Nanohybrid composite material was placed in all groups. Then the Shear Bond strengths of all groups were evaluated after applying 5000 thermal cycles (5–55 °C) to each sample. In the limitation of this in vitro study, it has been shown that rinsing with ozonated water of contaminated surfaces with blood and saliva after etching, has increased the micro-shear bond strength (μSBS) values more than that of in control group values. Also, the application of NaOCl, re-etching with 37% phosphoric acid for 15 seconds, and cleaning with CHX, significantly increase the bonding potential.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"10 1","pages":"516 - 525"},"PeriodicalIF":2.7,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75173423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-13DOI: 10.1080/01919512.2022.2157243
Ebru Reyyan Toroz, Yasemin Akdag, Malhun Fakioglu, Sevde Korkut, Ece Sagir Kurt, Ezgi Atli, H. Guven, H. Ozgun, I. Ozturk, M. Ersahin
ABSTRACT In recent years, there has been an increase in the interest on organic compounds originating from anthropogenic activities. The presence of these micropollutants in waterbodies can be detrimental for the aquatic organisms even at their trace concentrations. Removal of micropollutants from wastewater by conventional treatment methods is quite limited, thereby existing wastewater treatment plants are not capable of removing these micropollutants. This study investigated the removal of 27 micropollutants and conventional pollution parameters by ozonation of the effluent from a pilot-scale high-rate activated sludge system treating municipal wastewater. Different ozone dosages and contact times were tested during the study. Results revealed that 7 out of 27 micropollutants were detected in the effluent. Over 45% chemical oxygen demand (COD) removal and over 65% total suspended solids (TSS) removal were achieved by the ozonation process. Among the various ozone dosage and contact time combinations investigated in the study; 6 mg/L ozone dosage-20 min contact time, and 9 mg/L ozone dosage-10 min contact time alternatives resulted with the best treatment performance in terms of the removal of micropollutants, COD, TSS, and turbidity. A feasibility analysis was conducted to evaluate the best operational conditions from a techno-economic perspective and the results revealed that the unit cost for ozonation process ranged between 0.033 $/m3 and 0.043 $/m3. Additionally, considering the feasibility, 6 mg/L ozone dose – 20 min contact time combination was found as the optimum alternative. Based on the promising results obtained in this study, ozonation can be offered as a polishing step for the effluents of high-rate activated sludge systems for the improving of the effluent quality.
{"title":"Effects of Ozone Dose and Contact Time on Ozonation Process Performance for Treatment of High Rate Activated Sludge Process Effluent","authors":"Ebru Reyyan Toroz, Yasemin Akdag, Malhun Fakioglu, Sevde Korkut, Ece Sagir Kurt, Ezgi Atli, H. Guven, H. Ozgun, I. Ozturk, M. Ersahin","doi":"10.1080/01919512.2022.2157243","DOIUrl":"https://doi.org/10.1080/01919512.2022.2157243","url":null,"abstract":"ABSTRACT In recent years, there has been an increase in the interest on organic compounds originating from anthropogenic activities. The presence of these micropollutants in waterbodies can be detrimental for the aquatic organisms even at their trace concentrations. Removal of micropollutants from wastewater by conventional treatment methods is quite limited, thereby existing wastewater treatment plants are not capable of removing these micropollutants. This study investigated the removal of 27 micropollutants and conventional pollution parameters by ozonation of the effluent from a pilot-scale high-rate activated sludge system treating municipal wastewater. Different ozone dosages and contact times were tested during the study. Results revealed that 7 out of 27 micropollutants were detected in the effluent. Over 45% chemical oxygen demand (COD) removal and over 65% total suspended solids (TSS) removal were achieved by the ozonation process. Among the various ozone dosage and contact time combinations investigated in the study; 6 mg/L ozone dosage-20 min contact time, and 9 mg/L ozone dosage-10 min contact time alternatives resulted with the best treatment performance in terms of the removal of micropollutants, COD, TSS, and turbidity. A feasibility analysis was conducted to evaluate the best operational conditions from a techno-economic perspective and the results revealed that the unit cost for ozonation process ranged between 0.033 $/m3 and 0.043 $/m3. Additionally, considering the feasibility, 6 mg/L ozone dose – 20 min contact time combination was found as the optimum alternative. Based on the promising results obtained in this study, ozonation can be offered as a polishing step for the effluents of high-rate activated sludge systems for the improving of the effluent quality.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"12 1","pages":"431 - 445"},"PeriodicalIF":2.7,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79547070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1080/01919512.2022.2153645
P. Drogoudi, G. Pantelidis, T. Thomidis
ABSTRACT Postharvest fruit rot is one of the most serious diseases of fleshy stone fruits such as nectarine and plum. The efficacy of ozonated water sprayed in different doses in a packing line [low dose, 1.5 ppm ozone (Ο3) for 100 sec; medium dose, 3.0 ppm Ο3 for 100 sec; high dose, 1.5 ppm Ο3 for 400 sec] in controlling the brown rot (Monilinia fructicola) development was studied in the nectarine cultivar ‘Τasty Free’ and the plum cultivar ‘Angelino.’ Changes in flesh firmness, ripening index, ethylene and respiration rate, and peel color during storage (0℃ for 3 weeks) and shelf-life (20℃ for 4 days) were used as ‘indicator’ quality parameter responses in storage and shelf-life. The most efficient dose of O3 in controlling the Monilinia infection was the highest applied, followed by the middle O3 dose. The efficacy of O3 treatments was higher when a lower Monilinia spore concentration was applied. The O3 doses applied did not cause any visible symptoms of O3 toxicity, yet they caused an acceleration in the fruit ripening process, suggested mainly by an increase in the fruit respiration rate in both nectarine and plum, and an increase in the ripening index and darker peel coloration only in plums. In conclusion, spraying with ozonated water is an eco-friendly and efficient sanitizing agent, but in fleshy commodities such as nectarine and plum may diminish their postharvest performance.
{"title":"Impact of Ozonated Water on Brown Rot Development and Storage Potential of Nectarine and Plum","authors":"P. Drogoudi, G. Pantelidis, T. Thomidis","doi":"10.1080/01919512.2022.2153645","DOIUrl":"https://doi.org/10.1080/01919512.2022.2153645","url":null,"abstract":"ABSTRACT Postharvest fruit rot is one of the most serious diseases of fleshy stone fruits such as nectarine and plum. The efficacy of ozonated water sprayed in different doses in a packing line [low dose, 1.5 ppm ozone (Ο3) for 100 sec; medium dose, 3.0 ppm Ο3 for 100 sec; high dose, 1.5 ppm Ο3 for 400 sec] in controlling the brown rot (Monilinia fructicola) development was studied in the nectarine cultivar ‘Τasty Free’ and the plum cultivar ‘Angelino.’ Changes in flesh firmness, ripening index, ethylene and respiration rate, and peel color during storage (0℃ for 3 weeks) and shelf-life (20℃ for 4 days) were used as ‘indicator’ quality parameter responses in storage and shelf-life. The most efficient dose of O3 in controlling the Monilinia infection was the highest applied, followed by the middle O3 dose. The efficacy of O3 treatments was higher when a lower Monilinia spore concentration was applied. The O3 doses applied did not cause any visible symptoms of O3 toxicity, yet they caused an acceleration in the fruit ripening process, suggested mainly by an increase in the fruit respiration rate in both nectarine and plum, and an increase in the ripening index and darker peel coloration only in plums. In conclusion, spraying with ozonated water is an eco-friendly and efficient sanitizing agent, but in fleshy commodities such as nectarine and plum may diminish their postharvest performance.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"45 1","pages":"410 - 418"},"PeriodicalIF":2.7,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79212520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-21DOI: 10.1080/01919512.2022.2125362
Kiany de Oliveira Firmino, Francielli Lima dos Santos, M. S. Marques, Bárbara Souza da Costa, G. D. S. Collar, J. Caierão, A. Fuentefria, Irene Clemes Külkamp Guerreiro, R. V. Contri
ABSTRACT Some antimicrobial substances have unwanted side effects, besides difficulty in crossing the stratum corneum, prompting the need to search for alternative treatments. Ozonated vegetable oils present activity against some fungi and bacteria. This study has aimed to develop and characterize nanoemulsions and polymeric nanocapsules containing 5% ozonated sunflower seed oil for skin application with potential activity against skin pathogens. The formulations were obtained by interfacial deposition of preformed polymer (polymeric nanocapsules) and emulsification followed by Ultra-Turrax® agitation (nanoemulsion). The nanometric systems were evaluated in terms of their organoleptic and physicochemical properties, as well as ozonides presence. The stability of the systems was analyzed by centrifugation (pre-stability) and after 30 days in oven (40 °C) and refrigerator (4 °C) conditions. The antimicrobial activity was determined in vitro using dermatophytes, Candida and Staphylococcus species. Both formulations appeared white and homogeneous, with typical ozonated oil odor. The mean diameters and pH values were, respectively, 139 ± 7.6 nm and 3.2 ± 0.1 for the nanoemulsion and 149 ± 6.1 nm and 3.3 ± 0.2 for the polymeric nanocapsules. Zeta potential was −9 mV (nanoemulsion) and +11 mV (polymeric nanocapsules). The presence of ozonides was confirmed by FT-IR and the nanometric systems were considered stable. Susceptibility tests showed greater potential for the nanometric systems containing ozonated oil against fungi, especially dermatophytes. It was possible to increase the antimicrobial efficacy of the ozonated oil for eighteen of the twenty pathogen isolates tested. Thus, the developed nanometric systems containing ozonated oil may be considered potential treatments for skin infections.
{"title":"Nanometric Systems Containing Ozonated Oil with Potential Activity against Skin Pathogens","authors":"Kiany de Oliveira Firmino, Francielli Lima dos Santos, M. S. Marques, Bárbara Souza da Costa, G. D. S. Collar, J. Caierão, A. Fuentefria, Irene Clemes Külkamp Guerreiro, R. V. Contri","doi":"10.1080/01919512.2022.2125362","DOIUrl":"https://doi.org/10.1080/01919512.2022.2125362","url":null,"abstract":"ABSTRACT Some antimicrobial substances have unwanted side effects, besides difficulty in crossing the stratum corneum, prompting the need to search for alternative treatments. Ozonated vegetable oils present activity against some fungi and bacteria. This study has aimed to develop and characterize nanoemulsions and polymeric nanocapsules containing 5% ozonated sunflower seed oil for skin application with potential activity against skin pathogens. The formulations were obtained by interfacial deposition of preformed polymer (polymeric nanocapsules) and emulsification followed by Ultra-Turrax® agitation (nanoemulsion). The nanometric systems were evaluated in terms of their organoleptic and physicochemical properties, as well as ozonides presence. The stability of the systems was analyzed by centrifugation (pre-stability) and after 30 days in oven (40 °C) and refrigerator (4 °C) conditions. The antimicrobial activity was determined in vitro using dermatophytes, Candida and Staphylococcus species. Both formulations appeared white and homogeneous, with typical ozonated oil odor. The mean diameters and pH values were, respectively, 139 ± 7.6 nm and 3.2 ± 0.1 for the nanoemulsion and 149 ± 6.1 nm and 3.3 ± 0.2 for the polymeric nanocapsules. Zeta potential was −9 mV (nanoemulsion) and +11 mV (polymeric nanocapsules). The presence of ozonides was confirmed by FT-IR and the nanometric systems were considered stable. Susceptibility tests showed greater potential for the nanometric systems containing ozonated oil against fungi, especially dermatophytes. It was possible to increase the antimicrobial efficacy of the ozonated oil for eighteen of the twenty pathogen isolates tested. Thus, the developed nanometric systems containing ozonated oil may be considered potential treatments for skin infections.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"10 1","pages":"398 - 409"},"PeriodicalIF":2.7,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75333322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-18DOI: 10.1080/01919512.2022.2124953
A. Baddouh, B. El Ibrahimi, E. Amaterz, R. Oukhrib, L. Bazzi
ABSTRACT The electrochemical oxidation of a real wastewater discharged by the baths of “Dar Dbagh” tannery (DDT) in Fez city (Morocco) was performed using Ti/Ti0.7Ru0.3O2 anode (a dimensionally stable anode (DSA)-type electrode) underflow condition. The effect of different operational parameters, namely chloride ions concentration, electrolysis time, current density, initial pH, and temperature has been studied in detail. The discoloration and chemical oxygen demand (COD) removal have been taken as the key experimental indicators to monitor the electrochemical treatment process of DDT wastewater. The obtained results have shown that the best degradation rates (i.e., 100% and 56% of de-colorization and COD removal, respectively) were accomplished under acidic conditions at 20 mA cm−2 as a current density in the presence of 0.033 M Na2SO4 + 0.800 M NaCl as supporting electrolyte at room temperature. The maximum reduction of the effluent COD attained using Ti/Ti0.7Ru0.3O2 anode consuming 39.24 kWh per m3 clearly shows that DSA electrodes could be a good alternative for the remediation of DDT effluents.
采用Ti/Ti0.7Ru0.3O2阳极(尺寸稳定阳极(DSA)型电极)下流条件，对摩洛哥非斯市“Dar Dbagh”制革厂(DDT)生产的实际废水进行了电化学氧化。详细研究了氯离子浓度、电解时间、电流密度、初始pH和温度等不同操作参数对电解效果的影响。将脱色率和化学需氧量(COD)去除率作为监测DDT废水电化学处理过程的关键实验指标。结果表明，在室温条件下，以0.033 M Na2SO4 + 0.800 M NaCl为支撑电解质，在电流密度为20 mA cm−2的酸性条件下，脱色率和COD去除率分别为100%和56%。使用Ti/Ti0.7Ru0.3O2阳极，出水COD的最大降幅为39.24 kWh / m3，这清楚地表明DSA电极可能是DDT废水修复的良好替代方案。
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