Zohreh Didar
Young Researchers and Elite Club, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
[ 1 ] - Removal of Impurities fromWaste Oil by Combination of Eggshell and Eggshell's active Carbon for Biodiesel Production
Waste oil is an inexpensive source for biodiesel production, but the high amount of impurities present (free fatty acids, oxidation products) impedes its practical application. The aim of this work is to assess the purification efficiency of the adsorption process with eggshell and its active carbon. Carbonization of eggshell was done at 200 ºC for 4 hours. For activation of the resultant carbo...
[ 2 ] - Synthesis and characterization of acrylic acid grafted gum tragacanth and its effect in Fe2+ removal
In this paper, grafting of acrylic acid monomer on Gum tragacanth was performed. Variable of experiment included concentration of initiators and monomer, time, and temperature. Grafting efficiency was measured in the term of percentage of grafting (%G) and percentage of grafting efficiency (%E). Effectiveness of grafted gum in ferrous ion removal at different condition was assessed. According t...
[ 3 ] - Bioflocculant production by different microbial species and their potential application in dairy wastewater treatment
The aim of this study was to characterize the bioflocculants secreted from Bacillus subtilis (B. subtilis), Aspergillus oryzae (A. oryzae) and Rhizopus oligosporus (R. oligosporus). For precise investigation of bioflocculants, fourier transform infrared (FTIR) spectroscopy was performed, and pH and temperature stability, and decolorization efficiency were evaluated. In addition, the effects of ...
[ 4 ] - بررسی اثرات ضدمیکروبی نانوذرات ترکیبی مس و آلومینیوم - اکسید روی و اثرات سینرژیستی با بیوسایدیهای مختلف بر علیه باسیلوس سرئوس
Background: The purpose of this study was to investigate the effect of copper and aluminum-zinc oxide nanoparticles and their synergistic effects with conventional biocides against Bacillus cereus. Methods: Synthesis of copper-zinc oxide, aluminum-zinc oxide nanoparticles performed via co- precipitation method and nanoparticle properties were investigated using FTIR, XRD and TEM. The antimicro...
[ 5 ] - تولید انرژی های تجدیدپذیر از پسماندهای ناشی از تولید و فرآوری مواد غذایی
خطوط فرآوری مواد غذایی برای تبدیل مواد خام به فرآورده نهایی، انرژی زیادی مصرف میکنند به طوری که صنعت مواد غذایی یکی از هفت صنعت پرمصرف انرژی محسوب میشود. در این صنعت علاوه بر مصرف بالای انرژی، میزان زیادی ضایعات جامد و مایع نیز تولید میگردد. این ضایعات اساساً شامل مواد آلی بیولوژیک تجزیهپذیر هستند که تخلیه آنها در محیط، مشکلات محیط زیستی قابل توجهی ایجاد میکند. به طور معمول میزان زیادی از...
[ 6 ] - بررسی استفاده از روشهای مختلف شستشوی کاهو در کاهش بار میکروبی باسیلوس سرئوس
یکی از عوارض مصرف سبزیجات تازه، احتمال آلودگی آنها به باکتریهای بیماریزا است. شستشوی سبزیجات تازه نقش مهمی در کاهش جمعیت میکروبی و افزایش ایمنی مصرف این گونه محصولات دارد. آب الکترولیز شده به عنوان یک ضدعفونی‌کننده جدید در سالهای اخیر مورد توجه قرار گرفته است. این ضدعفونی‌کننده، بی خطر، ارزان و ایمن است که اثر آن بر روی گونه‌های مختلف میکروبها، قارچ ها و ویروس ها تأیید شده است. در این مطالعه اس...
[ 7 ] - ملاحظات سموم و بسته بندی های مواد غذایی برای سلامتی
فرآوری و نگهداری مواد غذایی با هدف افزایش کیفیت، ماندگاری و ایمنی مواد غذایی انجام میشود. سموم ایجاد شده در نتیجه فرآوری مواد غذایی ترکیباتی هستند که اثرهای نامطلوبی بر سلامتی و ساختار فیزیولوژیکی انسان دارند. برخی از مهمترین سمومی که در اثر فرآوریهای حرارتی مواد غذایی به وجود میآیند شامل اکریل آمید، آکرولئین، آمینهای آروماتیک هتروسیکلیک، فوران، هیدروکسی متیل فورفورال، کلروپروپانلها و اس...
[ 8 ] - Investigation of the effect of biosurfactant of Bacillus subtilis against Staphylococcus strains biofilms
Background: Biosurfactants are compounds that are produced by different microorganisms and have an emulsifying property. This study aimed to investigate extractive biosurfactant from bacillus subtilis (PTCC1720) against the biofilms of Staphylococcus aureus (PTCC 1112), Staphylococcus saprophyticus (PTCC 1440) and Staphylococcus epidermidis (PTCC 1435). Materials and Methods: This study was con...
[ 9 ] - The Effect of Biosurfactant of Saccharomyces Cerevisiae on Biofilms Produced by Staphylococcus Aureus, Epidermidis and Saprophyticus: A Laboratory Study
Background and Objectives: Biosurfactants are amphiphilic molecules produced by microorganisms that due to surfactant activity, have several applications in different industries such as cleaning, emulsification, foaming and dispersion. The aim of this study was to investigate the effect of biosurfactant extracted from saccharomycess cerevisiae on biofilm formation of staphylococcus aureus (PTC...
[ 10 ] - The Study of Antimicrobial and Anti-Enzymatic Activity (Potato Poly Phenol Oxidase) of Cinnamomum Verum Hydrosol: A Laboratory Study
Background and Objectives: Cinnamon contains phenolic and non-phenolic bioactive compounds. The aim of this research was investigating the antimicrobial and anti-enzymatic properties of cinnamon (Cinnamomum verum) hydrosol. Materials and Methods: In this laboratory study, chemical composition of cinnamon hydrosol was analyzed by Gas chromatography–mass spectrometry method. Antibacterial effec...
[ 11 ] - Efficacy of impregnated active carbon in manganese removal from aqueous solutions
Adsorption is a chemical method for water purification. In the present study, native and impregnated active carbon was used for adsorption to evaluate the efficacy of the process in manganese removal from aqueous solutions. Impregnation reaction was performed using the precipitate colloids of manganese oxides onto the carbon surface. X-ray diffraction, Fourier-transform infrared spectroscopy, a...
[ 12 ] - Effects of Coatings with Pectin and Cinnamomum verum Hydrosol Included Pectin on Physical Characteristics and Shelf Life of Chicken Eggs Stored at 30°C
Background and Objectives: Increased environmental concerns about synthetic packaging have promoted developments of novel, environmentally-friendly edible films. In the present study, the quality parameters of chicken egg coated with pectin or pectin incorporated cinnamon hydrosol was assessed. Materials and Methods: Egg chicken were coated with pectin and pectin prepared with cinnamon hydroso...
[ 13 ] - بررسی اثرات ضدمیکروبی نانوذرات ترکیبی اکسید روی- منگنز و اکسید روی- آهن علیه باکتری شیگلا فلکسنری
در این تحقیق، سنتز نانوذرات منگنز- اکسید روی ، آهن- اکسید روی به روش ترسیب شیمیایی هم‌زمان و بررسی ویژگی-های ساختاری و مورفولوژیکی نانوذرات حاصله با استفاده از طیف مادون قرمز فوریه، پراش اشعه X و میکروسکوپ الکترونی عبوری صورت گرفت. اثرات ضد میکروبی نانوذرات در برابر باکتری شیگلا فلکسنری (PTCC 1234) توسط روش تعیین قطر هاله عدم رشد سنجیده شد. میزان هم افزایی نانوذرات با دو ماده پراکسید هیدروژن و ...
[ 14 ] - Investigating the mechanical, physical and antimicrobial properties of gelatin films containing Cinnamomum verum hydrosol
Hydrosol is a side product of essential oil extraction from plants. In this study, the effect of various ratios (5-100 %v/v) of cinnamon hydrosol replacement in the formulation of edible gelatin films was investigated. Physical properties were evaluated and the antibacterial properties of gelatin films against Staphylococcus aureus, Staphylococcus saprophyticus and Staphyl...
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