نتایج جستجو برای: potassium permanganate
تعداد نتایج: 78123 فیلتر نتایج به سال:
An efficient three-step synthesis of d-mannoheptulose was successfully accomplished from 2,3,4,5,6-penta-O-benzyl-d-mannose. First, an olefinated sugar was prepared from 2,3,4,5,6-penta-O-benzyl-d-mannose via a Wittig reaction. Second, the key step, a 2-hydroxyoxirane product was unexpectedly obtained by oxidation of the olefinated sugar with potassium permanganate in aqueous acetone. Finally d...
Three basement membrane components, laminin, collagen IV, and heparan sulfate proteoglycan, were mixed and incubated at 35°C for 1 h, during which a precipitate formed. Centrifugation yielded a pellet which was fixed in either potassium permanganate for ultrastructural studies, or in formaldehyde for Lowicryl embedding and immunolabeling with protein A-gold or anti-rabbit immunoglobulin-gold. T...
This paper reports a sequential injection spectrophotometric method for determining the concentration of diclofenac (DCF) in urine samples and pharmaceutical formulations. The method is based on the reaction of DCF with potassium permanganate in an alkaline medium. The influence on the analytical signal of the reactor length, the permanganate volume, the sample volume and the flow rate was inve...
برداشتن گامی موثر در جهت پیشرفت صنعت نساجی، تحقیق و بررسی در زمینه انسجام تکمیلهای خاص را ضروری می سازد. از آنجا که تا کنون اثر سفیدکنندگی پتاسیم پرمنگنات به عنوان یک اکسنده قوی بر روی پارچه ی پنبه ای خام بررسی نشده است این مهم هدف اصلی تدوین رساله مزبور میباشد. به این منظور تاثیرات ناشی از افزایش غلظت پتاسیم پرمنگنات و اگزالیک اسید، دما و زمان عمل سفیدگری بر روی خواص فیزیکی و شیمیایی کالای پنب...
4-Allyl-4-hydroperoxy-2-methoxycyclohexa-2,5-dienone (5) was synthesized by photooxygenation of commercially available Eugenol in the presence of tetraphenylporphyrin (TPP) as a singlet oxygen sensitizer. The brief and one-pot syntheses of some natural product skeletons were conducted using the corresponding allylic hydroperoxide at different temperatures (0 o C and room temperature) with potas...
Insect chitin was isolated from adult Holotrichia parallela by treatment with 1 M HCl and 1 M NaOH, following by 1% potassium permanganate solution for decolorization. The yield of chitin from this species is 15%. This insect chitin was compared with the commercial a-chitin from shrimp, by infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and elemental analysis. Both chiti...
‘Golden Delicious’ apples were vacuum infiltrated (250 mm Hg) with 0, 4, and 6% solutions of CaCl2 followed by heat treatment for 0, 48 and 72 hours at 38oC. Treated fruits were stored at 0oC with RH of 85-90% for 2.5 and 5 months, followed by one week of storage at 20C. The results showed that fruits treated with 4 and 6% of CaCl2 significantly increased calcium content of fruits after 2.5 an...
Enrichment of zeolite and sponge as ethylene absorbent with potassium permanganate was theidea of this study to provide an efficient way to scavenge ethylene during storage period ofthree Rosa hybrida cv. ‘Shiraz’, ‘Avalanche’, and ‘After-party’ cut flowers. A preliminaryexperiment revealed that two mL of potassium permanganate solution (1 mM) was enough toenrich two gra...
In the past, we have modified PAN fibers with potassium permanganate, shortened the oxidation time[ 14], enhanced the tensile strength of the carbon fibers[5], and studied the changes in the physical properties and microstructure of fibers during the process of oxidation[6]. in this article, the study is focused on the changes in the microstructure of PAN graphite fibers during the graphitizati...
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