نتایج جستجو برای: peroxide value
تعداد نتایج: 764700 فیلتر نتایج به سال:
freezing causes changes on chemical and microbial quality of butter. in this research, effects of two different temperatures -9 and -18oc on changes of moisture, fat, acidity and peroxide value and also coliform and psychrotrophic microorganisms in frozen butter were studied. results showed that values of moisture and fat during 7 months of frozen storage at two temperatures decreased 1.8% and ...
Introduction: Bleaching products with oxidizing mechanism can exert side effects on the restorative materials existing in the oral cavity. Since bleaching agents are applied in different concentrations, the present study aimed to compare the effect of different bleaching regims of carbamide peroxide on microhardness of Z250 microhybride composite. Methods: In this in vitro study , 32 specime...
in the present study, oxidative stability of canola oil extracted with hot press at 85-100ºc was compared with unheated canola oil extracted with cold press at 40-45ºc.the stability of oil was measured every week during a four months storage using free fatty acid, acid value, peroxide value, anisidine value, totex value and rancimat test. the results obtained showed that pretreatment and method...
Background and Objectives: Stability of the products made from pistachios depends on stability of the oil. Oxidized oil includes unpleasant taste and thus its quality and shelf-life decreases. The aim of this study was to assess pistachio oil oxidation stability alone and in combination with Carotino oil and monoglyceride emulsifier using method of accelerated temperature (60 °C). Materials &...
in this study extract of olive leaf was added to butter samples at three concentrations, 0.05, 0.1 and 0.5% and after vaccum packaging, were kept in refrigerator for 90 days. acid and peroxide value, microbial culture , polyphenol content of samples ,hardness, oxidative stability, sensory characteristics of samples including flavor, textural and apparent characteristics of samples and dpph radi...
Background and Objective: Hydrogen peroxide is one of the compounds that is primarily produced by the oxidation of oil and fat and causes various diseases, including atherosclerosis and coronary artery disease .The aim of this study was to survey the peroxide value of edible oils used in sandwich and falafel shops in Tehran in 2016. Materials and Methods: In this study, sampling from a numb...
castor oil due to extraordinary physicochemical properties has numerous applications in pharmaceutical, chemical, hygienic, biodiesel and nowadays in food industries. during plant growth and development, as well as during postharvest and processing, different factors may affect caster oil properties. this study was conducted to evaluate oil content and physiochemical properties under different ...
Background: Oils and fats are among the important constituents of foods. Lipid oxidation can cause changes in taste, flavor, smell, color, texture, and nutritional value of the foods. Deep-fat frying (temperatures of 150 to 200 °C) leads to a series of chemical and physical reactions, so that the oil is oxidized, polymerized, and hydrolyzed. Methods: In a current descriptive cross-sectional stu...
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