جستجوی مقالات مرتبط با کلیدواژه « Coloring Agents » در نشریات گروه « پزشکی »
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Environmental Health Engineering and Management Journal, Volume:10 Issue: 4, Autumn 2023, PP 419 -428Background
The widespread presence of organic dyes in the various industries’ effluent such as paper, textile, and clothing has led to significant environmental pollution. Titanium oxide (TiO2) nanoparticles immobilized on zeolite (ZSM-5) were investigated under UV light for activation of peroxymonosulfate (PMS) for photocatalytic degradation of Orange II (OII) dye in aqueous solutions.
MethodsIn this study, the photocatalyst used was prepared by immobilizing different amounts of TiO2 nanoparticles on ZSM-5. Characterization analyses including X-ray diffractometer (XRD), Fourier transform infrared (FTIR), BET, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were performed on the synthesized samples. Then, the effect of various parameters, such as TiO2 nanoparticles loading onto the ZSM- 5, pH, contact time, dye concentration, and TiO2/ZSM-5 dosage, is investigated for the removal of OII as a model molecule under the UV irradiation with 15 W power.
ResultsThe highest removal percentage of OII dye (97.44%) was obtained in the optimal operating conditions of pH = 3, the initial dye concentration = 5 ppm, amount of TiO2/ZSM-5 = 10 mg/L, amount of PMS = 50 mg/L, and reaction time = 120 minutes. The Langmuir–Hinshelwood kinetics model fitted with the experimental data.
ConclusionThe obtained results of this research showed that PMS can be used as a suitable oxidant activated with ZSM-5/TiO2 nanocomposite in OII degradation in different water environments, by optimizing the effective operating factors.
Keywords: Coloring agents, Titanium dioxide, Peroxymonosulfate, Textiles, ZSM-5 zeolite} -
IntroductionDenture cleansers effectively reduce plaque formation; nonetheless, there is a dearth of studies on their efficiency in stain removal and the reduction of multispecies biofilms. The present study aimed to determine the ability of different denture cleansers to remove different stains.MethodsA total of 90 central incisors with A1 color were randomly assigned to three groups. Specimens were immersed into three staining solutions (black tea, coffee, and wine). After staining, colorimetry measurements were made, and specimens were immersed in denture cleansers (Protefix Active Cleanser and Aktident Cleansing Tablet) or tap water (control). Color difference (ΔE*ab) was determined after two, four, and six months (n=10). Data were statistically analyzed using the Kruskal-Wallis analysis and Dunn's multiple comparison test at the %95 confidence level.ResultsThere was no significant difference between the stain removal efficacy of denture cleansers and the control group for all staining solutions. When the ΔE*ab values were compared according to different time periods, specimens exposed to three different staining solutions and cleaned by denture cleaners and tap water showed no significant difference (P>0.05). In all time periods, teeth exposed to tea and immersed in the Protefix demonstrated higher color difference values (ΔE*ab>5.5). Color differences of all groups were perceptible to the eye (ΔE*ab>1.8). There were no significant differences among denture cleansers in different time periods (P>0.05).ConclusionThere was no significant difference among the denture cleansers regarding stain removal capacity. The soaking time of stained artificial teeth in denture cleansers did not change their color.Keywords: Coloring Agents, color, dentures, Denture cleansers}
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Journal of Environmental Health and Sustainable Development, Volume:7 Issue: 2, Jun 2022, PP 1660 -1675Introduction
Biodegradation of azo dyes under harsh environmental conditions has been of great interest for the treatment of colored effluents. The present study aims to evaluate Klebsiella quasipneumoniae GT7 for degrading azo dye Carmoisine under extreme pH conditions and high salinity.
Materials and MethodsThe growth profiles of bacteria were compared under different conditions of salinity and pH, using the optical density and viability measurements. Kinetic patterns of decolourization by GT7 were investigated under different concentrations of NaCl and/or pH, through the spectrophotometry method. Moreover, thin layer chromatography (TLC) was used to evaluate the biotransformation of Carmoisine into aromatic amines. Scanning electron microscopy (SEM) was carried out to analyze any morphological changes in bacteria under stress conditions.
ResultsGT7 showed OD-based growth and sustainable viability under [NaCl] ≤ 15% and/or initial pH between 3-11. The viable but nonculturable (VBNC) state explained the bacteria's survival under attenuated growth due to bacterial inefficiency to maintain cytoplasmic osmotic balance, vital turgor pressure, and pH homeostasis. Biodecolourization was accomplished during 48h, where Carmoisine was 50mg/l, [NaCl] ≤ 20%, and/or initial was pH 5-11. TLC, OD600nm and pH measurements as well as visual observation of bacterial pellets at the end of the decolourization confirmed biodegradation as the dominant mechanism, except for pH 3, where dye was removed via adsorption to the cell surface. SEM showed morphological alteration of GT7 from rod to coccoid shape as an approach to resist the harsh conditions ratio.
ConclusionGT7 is shown as an efficient strain for azo dye degradation in harsh environmental conditions.
Keywords: Azo Compounds, Klebsiella, Salinity, Extremophiles, Coloring Agents} -
BackgroundRecently, concerns have been raised regarding the environmental and public health safety of azo dyes, the most widely used synthetic dyes. The membrane technique has been introduced as one of the efficient methods for dye removal treatments. Polyvinylidene fluoride (PVDF) membrane manipulated by surfactants was studied for removal of the azo dye, carmoisine.MethodsPVDF membrane was prepared via non-solvent-induced phase separation (NIPS) and used to remove the azo dye, carmoisine. Three nonionic surfactants including Tween 20, Tween 60, and Tween 80 were used individually as additives in casting solutions to improve PVDF membrane properties.ResultsFourier-transform infrared spectroscopy (FTIR) demonstrated the presence of functional groups of carbonyl (C=O) and hydroxyl (OH), assigned to Tween molecules, in the membrane chemical structure. All Tween species caused a decrease in the surface hydrophobicity of PVDF membranes illustrated by the reduced contact angles. Each Tween at a 2% concentration in the dope solution led to an increase in the pore-size of PVDF membranes, which was estimated by scanning electron microscopy (SEM). However, this impact was reversed at Tween concentrations of 4%. Membranes were assessed for dye removal efficiency and permeate flux in a cross-flow system. Permeability of PVDF membranes improved (~78%) with adding Tween 80 at a concentration of 2%. Tween 60 at a 2% concentration
resulted in a ~45% increase in dye removal efficiency of PVDF membranes. And, atomic force microscopy (AFM) showed that Tween 60 increased membrane surface roughness.ConclusionSurfactant-mediated changes in the surface properties of PVDF membrane improved dye removal efficacy.Keywords: Polyvinylidene fluoride, Coloring agents, Azo compounds, Surface-active agents} -
Environmental Health Engineering and Management Journal, Volume:6 Issue: 3, Summer 2019, PP 203 -213BackgroundToday, due to increasing usage of dyes in various industrials and their destructive effects on health and environment, it is necessary to remove them from industrial wastes. Although there are few studies on the use of rice bran modified with polyaniline (RB/PANI) for removal of different dyes, but the effect of this adsorbent on the removal of Acid Orange 7 (AO7) dye has not been evaluated yet. Therefore, this study was conducted to investigate the removal of AO7 dye by RB/PANI as an adsorbent.MethodsThe adsorbent characteristics were determined using scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Also, the adsorbent surface area was measured by Brunauer–Emmett–Teller (BET) technique. The method of one-factor-at-a-time was used to optimize various factors including pH, temperature, and adsorbent dosage.ResultsThe optimal values for the factors affecting AO7 dye removal were calculated. It was revealed that the maximum dye removal was obtained at pH = 3, temperature = 25˚C, dye concentration = 30 mg/L, adsorbent dosage = 30 mg/L, and contact time= 60 minutes. The maximum removal percentage for RB/PANI was 97.13%. It was also revealed that Langmuir isotherm is the best fitted isotherm model.ConclusionAccording to the results, the polyaniline-modified rice bran could be used as an excellent adsorbent for the removal of AO7 from aqueous solutions. The maximum dye removal efficiency for AO7 was obtained at pH = 3. Also, it was revealed that AO7 dye removal follows the pseudo second order kinetic model and it is a spontaneous process.Keywords: Temperature, Adsorption, Coloring agents, Kinetics, Thermodynamics}
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Nowadays, due to increasing usage of dye in various industries and its destructive effects on health and environment, it is necessary to remove dyes from industrial wastes. Although few studies can be found on using pine cone for removal of different dyes, it has not been used yet to remove Reactive Blue 203 (RB203) dye. The purpose of this study is to investigate RB203 dye adsorption using activated carbon produced from pine cone. Optimal values of influencing factors for RB203 dye removal were obtained. The results showed that the maximum removal was occurred at a pH of 2, temperature of 30˚C, dye concentration of 30 mg/L, adsorbent dosage of 100 mg/L, and contact time of 15 min. The maximum removal percentage was 98.48%. In order to study the synthesized activated carbon, some characterization methods including scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy and Brunauer-Emmett-Teller (BET) have been used. Investigation of adsorption isotherm models revealed that adsorption of RB203dye can be described through D-R and Temkin isotherm models. Additionally, RB203 dye removal follows the pseudo-first-order kinetic equation.
Keywords: Pine cone, Adsorption, Activated carbon, Thermodynamics, Coloring agents, Kinetics} -
بررسی میزان مصرف رنگ های خوراکی مجاز و غیرمجاز در مواد غذایی عرضه شده در شهرستان نظرآباد در سال 1395زمینه و هدفامروزه فناوری پردازش مواد غذایی برای افزایش ماندگاری یا بهتر نمودن ظاهر، ترکیب، بافت، طعم، رنگ، بو و ارزش غذا رو به سوی استفاده از افزودنی های مواد غذایی آورده است. افزایش فراوان استفاده از رنگ های مصنوعی و مواد افزودنی علاوه تحریک اشتها و خوش طعمی غذا و بهبود شکل ظاهری آن و پنهان کردن نواقص ماده غذایی، ممکن است منجر به اثرات جانبی خطرناک احتمالی در مصرف کنندگان گردد. لذا هدف این مطالعه، بررسی کیفیت و فراوانی رنگ های مصنوعی مصرفی و غیرمجاز در مواد غذایی عرضه شده در شهرستان نظرآباد می باشد.مواد و روش هادر این مطالعه توصیفی- مقطعی، شیرینی های خشک، جوجه کباب خام و سس جوجه کباب در قنادی ها، رستوران ها و اغذیه فروشی ها شهرستان نظرآباد ازنظر مقدار رنگ مصنوعی موردمطالعه گرفت. تعداد 25 نمونه از واحدهای موجود به صورت تصادفی بر اساس بیشترین احتمال وقوع نمونه گیری شد و به آزمایشگاه مواد غذایی انتقال یافت پس از استخراج رنگ احتمالی، مقدار رنگ موجود در نمونه ها با روش کروماتوگرافی مورد شناسایی قرار گرفت.یافته هابر اساس نتایج به دست آمده 88 درصد نمونه ها حاوی رنگ های مصنوعی غیرمجاز و 12درصد نمونه ها حاوی رنگ های مصنوعی مجاز بودند. از این میزان 58/92 درصد از نمونه های شیرینی های خشک و81/81 درصد از نمونه های جوجه کباب خام و سس جوجه کباب از رنگ های مصنوعی غیرمجاز استفاده کرده بودند. و 14/7 درصد از نمونه های شیرینی های خشک و 18/18 درصد از نمونه های جوجه کباب خام و سس جوجه کباب از رنگ های مصنوعی مجاز استفاده کردند.نتیجه گیرینتایج نشان می دهد که فراوانی استفاده از رنگ های مصرفی مصنوعی، می تواند ناشی از ضعف دانش بهداشتی و ایمنی فروشندگان مواد غذایی، قیمت پایین این رنگ های و دسترسی آسان می باشد.کلید واژگان: روش کروماتوگرافی, عوامل رنگ زا, افزودنی های خوراکی}BackgroundNowadays food processing technology to extend life or improve the appearance, composition, texture, taste, color, smell, and nutrition value of the food is brought to the use of food additives. A significant increase in the use of synthetic colors and additives in addition to stimulate appetite and food palatability and improve its appearance and hide flaws food, it may lead to probable dangerous side effects in consumers. The aim of this study was to evaluate the quality and frequency of unauthorized and synthetic dyes consumption in supplied food of city Nazarabad Township.Materials And MethodsIn this descriptive cross-sectional study, the measure of synthetic dye in dried sweets, raw barbecue chicken and barbecue chicken sauce of confectionaries, food shops, and restaurants of the Nazarabad Township was studied. A total of 25 random samples of the existing units based on the highest probability was taken and were transferred to the food laboratory. After extraction probable dye, the measure of the dye were quantified using chromatography. Then, the Food colorings were compared with the national standard.ResultsAccording to the obtained results, 88% and 12% of the total samples were contained unauthorized synthetic and authorized synthetic dyes, respectively. The amount of 92.58% of the dried sweets samples, 81.18% of the raw barbecue chicken and barbecue chicken sauce samples were used unauthorized synthetic dyes, and 7.14% of dried sweets samples and 18.18% of the raw barbecue chicken and barbecue chicken sauce samples were used authorized synthetic dyes, respectively.Conclusionthe results show that the frequency use of synthetic dyes might be due to lack of health knowledge and safety of food vendors, low price and easy access of dyes.Keywords: Chromatography Method, Coloring Agents, Food Additives}
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Aims: The synthetic colors are preferred by the food industry because of the variety of shades, intensity, uniformity, excellent solubility and stability. They are used in a variety of food products such as dairy products, beverages, baked products, confections and pet foods. Food colors may have toxic effects on the human body. This study aimed to examine the amount of synthetic colors in some ready to use foods in Kashan, Iran.
Instrument &MethodsIn this cross sectional study, conducted in Kashan City, Iran, in March to October 2015, a total of 52 samples of meat products, 33 samples of sweets, 43 samples of drinks and 21 samples of miscellaneous foods were collected. The coloring agents were extracted of samples and purified using the hydrochloric acid extraction method. Thin layer chromatography was used to analyze the samples.
Findings: 72 samples (48.30%) contained no coloring and 77 samples (51.7%) contained artificial colors. The most coloring agents were in sweets (72.7%), drinks ( 51.2%) and meat products samples (48.10%). The quinoline yellow, tartrazine and sunset yellow were the most common coloring used in the various foods.ConclusionAbout 52% of examined foods contained artificial colors that have been banned by the national Iranian standards organization.Keywords: Coloring Agents, Chromatography, Thin Layer, Food} -
BackgroundAmong different pollutants released into the environment, dyes are considered as one of the most dangerous contaminants. In recent years, magnetic nanomaterials have attracted much attention for their dye removal capacity. The aim of this study was to explore the adsorption kinetics of an anionic dye (Reactive Orange 13 (RO)) by NiFe2O4 nanoparticles (NiFe2O4 NPs) under various conditions.MethodsNiFe2O4 nanoparticles (NiFe2O4 NPs) were prepared and characterized by X-ray diffraction (XRD), transmission electronic microscopy (TEM), pHpzc and BET methods. The adsorption characteristics of the NiFe2O4 NPs adsorbent were examined using Reactive Orange 13 as an adsorbate. The influences of parameters including pH, dose of adsorbent and contact time were investigated to find the optimum adsorption conditions.ResultsDecreasing solution pH and increasing contact time were favorable for improving adsorption efficiency. The kinetic and isotherm data of RO adsorption on NiFe2O4 NPs were well fitted by pseudo-second-order and Langmuir models, respectively.ConclusionThe maximal adsorption capacity of RO was 243.9 mg g-1 at 25◦C and pH 3.0 and the adsorption of RO on the NiFe2O4 NPs follows a monolayer coverage model. NiFe2O4 NPs might be an effective and potential adsorbent for removing anionic dyes from aqueous solutions.Keywords: Chemical Water Pollution, Coloring Agents, Magnetite Nanoparticles, Reactive Orange}
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زمینه و هدفامروزه، مضرات آنتی بیوتیک ها و نگهدارنده های سنتزی مشخص شده است و محققین در پی جایگزین هایی با منشا طبیعی و ایمن هستند. رنگ آناتو از جمله رنگهای پرمصرف در صنعت غذا بوده که دارای خصوصیات ضدمیکروبی و آنتی اکسیدانی می باشد. این مطالعه با هدف تعیین اثر ضدمیکروبی رنگ آناتو بر چند باکتری پاتوژن انجام شد.روش بررسیدر این مطالعه، رنگ آناتو از دانه های آناتو به روش خیساندن استخراج و پس از فیلتراسیون، با آون تحت خلا به شکل پودر درآورده شد. ارزیابی فعالیت ضدمیکروبی به روش انتشار دیسک صورت گرفت و میزان حداقل غلظت بازدارنده از رشد (MIC) و حداقل غلظت کشنده باکتری (MBC) به کمک روش رقت آگار بر روی باکتری های استافیلوکوکوس اورئوس، لیستریا اینوکوا، باسیلوس سرئوس و سالمونلا اینتریتیدیس محاسبه شد.یافته هادر این مطالعه، باسیلوس سرئوس و سالمونلا انتریتیدیس به ترتیب بیشترین و کمترین حساسیت را به رنگ آناتو نشان دادند. سالمونلا انتریتیدیس بین باکتری های مورد آزمون، بیشترین MIC را داشت و در غلظت های مورد آزمون رنگ آناتو تنها برای سالمونلا انتریتیدیس، MBC مشاهده نشد.نتیجه گیریطبق نتایج این مطالعه، رنگ آناتو بر رشد تمام باکتری های مورد آزمون موثر است. همچنین اثر ضدمیکروبی رنگ آناتو بر باکتری های گرم مثبت مورد آزمون نسبت به باکتری های گرم منفی به کار رفته بیشتر است. لذا با توجه به نتایج آزمایش می توان از رنگ آناتو به عنوان یک ممانعت کننده از رشد باکتری استفاده نمود.
کلید واژگان: مواد رنگی, آناتو, مواد ضدعفونی کننده, بیماری زا}Background And ObjectivesToday, disadvantages of antibiotics and synthetic preservatives have been identified, and researchers are seeking natural and safe alternatives. Annatto dye is one of the commonly used dyes in the food industry, which has antimicrobial and antioxidant properties. The objective of this study was to determine the antimicrobial effect of annatto dye on some pathogenic bacteria.MethodsIn this study, annatto dye was extracted from annatto seeds by maceration methods and after filtration, it was powdered by vacuum oven. Antimicrobial activity was evaluated by disc diffusion method and the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined using agar dilution method against Staphylococcus aureus, listeria innocua, Bacillus cereus and Salmonella enteritidis.ResultsIn this study, Bacillus cereus and Salmonella enteritidis, respectively, showed the highest and the lowest sensitivity to annatto dye. S. enteritidis had the highest MIC among the tested bacteria, and MBC was not observed only for S. enteritidis in the tested concentrations of annatto dye.ConclusionAccording to the results of this study, annatto dye was effective on the growth of all tested bacteria. Also, annatto dye had more antimicrobial effect on the tested gram-positive bacteria compared to gram-negative bacteria. Thus, considering the results of the experiment, annatto dye can be used as an inhibitor of bacterial growth.Keywords: Coloring Agents, Annatto, Anti, infective Agents, Pathogen} -
IntroductionColored compounds which often are toxic and carcinogen is one of the environmental pollutants. These pollutants should be removed prior than discharge to the environment. The aim of this study was the evaluation of maize tassel powder efficiency for the removal of Reactive Red 198 dye from synthetic textile wastewater.Materials and MethodsThis experimental study was performed in laboratory scale by using of batch reactors. In this study, the effect of adsorbent dose, contact time, initial dye concentration and pH had been evaluated. Maximum adsorption wavelength (λmax) and the concentration of dye were determined by UV/Vis spectrophotometer. The adsorbent was prepared in laboratory condition and pulverized by standard ASTM sieves with the range of 40-60 mesh. The data were analyzed with Langmuir and Freundlich isotherm models.ResultsThe result showed that increasing of adsorbent dose led to increasing of the adsorption efficiency but adsorption efficiency was decreased with an elevation of pH from 3 to 9 and increasing of dye concentration from 25 to 50 mg/l. With increasing reaction time, adsorption efficiency increased and the most adsorption occurred in first 30 min of reaction. Obtained data were in good concordance with both Langmuir and Freundlich isotherm models. The adsorption kinetics followed the pseudo-second-order equation.ConclusionMaize tassel powder is a natural and cheap adsorbent that can be used for the removal of contaminants in the environment.Keywords: Inflorescence, Adsorption, Kinetics, Waste Water, Textiles, toxicity, Environmental Pollutants, Coloring Agents}
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