E-journal of Chemistry最新文献

Screening for Hypoglycemic Activity on The Leaf Extracts of Nine Medicinal Plants: In-Vivo Evaluation 九种药用植物叶片提取物降血糖活性的筛选:体内评价

E-journal of Chemistry Pub Date : 2012-08-01 DOI: 10.1155/2012/103760

A. Arya, M. Abdullah, Batoul Sadat

{"title":"Screening for Hypoglycemic Activity on The Leaf Extracts of Nine Medicinal Plants: In-Vivo Evaluation","authors":"A. Arya, M. Abdullah, Batoul Sadat","doi":"10.1155/2012/103760","DOIUrl":"https://doi.org/10.1155/2012/103760","url":null,"abstract":"The traditional use of certain plants by the tribal community in central India involves using the young leaves for several ailments, including hyperglycaemia; this study was performed to evaluate the effects of the leaf extracts from 9 such plants in the management of diabetes. Initially, hypoglycemic screening was performed on normal rats whose blood glucose levels were measured before and after oral or intraperitoneal (i.p.) administration of the extracts at different periods. The plants were screened at doses of 250 mg/kg i.p. or 500 mg/kg orally. Of these, only Centratherum anthelminticum (Asteraceae), Cissus quadrangularis (Vitaceae), and Woodfordia fruticosa Kurz (Lythraceae) significantly reduced postprandial blood glucose levels in normal glycemic rats (P <0.001), with slight reductions effected by Sida acuta Burm F. (P = 0.002) and Parthenium hysterophorus L. (P = 0.017). The extracts that reduced postprandial blood glucose levels both orally and i.p. in the hypoglycemic screening tests were evaluated for glucose challenge in glucose tolerance tests with i.p and oral administration in overnight-fasted normal rats. The results of these tests potentiate the screening data in the management of diabetes mellitus, which requires further studies on the plants that yielded positive results to determine the active compounds in the different plant parts that are responsible for the activity.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/103760","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64292733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 36

Preparation and Characterization of Chitosan/Agar Blended Films: Part 2. Thermal, Mechanical, and Surface Properties 壳聚糖/琼脂混合膜的制备与表征:第2部分。热，机械和表面性能

E-journal of Chemistry Pub Date : 2012-04-16 DOI: 10.1155/2012/285318

E. A. Elhefian, M. Nasef, A. Yahaya

引用次数: 51

Preparation and Characterization of Chitosan/Agar Blended Films: Part 1. Chemical Structure and Morphology 壳聚糖/琼脂混合膜的制备与表征:第1部分。化学结构与形态

E-journal of Chemistry Pub Date : 2012-04-13 DOI: 10.1155/2012/781206

E. A. Elhefian, M. Nasef, A. Yahaya

引用次数: 58

Characterization of Extracellular Dextranase from a Novel Halophilic Bacillus subtilis NRC-B233b a Mutagenic Honey Isolate under Solid State Fermentation 新型嗜盐枯草芽孢杆菌NRC-B233b致突变蜂蜜分离物胞外葡聚糖酶的固态发酵特性

E-journal of Chemistry Pub Date : 2012-04-13 DOI: 10.1155/2012/860619

M. Esawy, Sara H. Mansour, E. Ahmed, N. M. Hassanein, H. E. Enshasy

{"title":"Characterization of Extracellular Dextranase from a Novel Halophilic Bacillus subtilis NRC-B233b a Mutagenic Honey Isolate under Solid State Fermentation","authors":"M. Esawy, Sara H. Mansour, E. Ahmed, N. M. Hassanein, H. E. Enshasy","doi":"10.1155/2012/860619","DOIUrl":"https://doi.org/10.1155/2012/860619","url":null,"abstract":"Bacillus subtilis NRC-B233b was isolated from Libyan honey sample proved to be a potent dextranase producer by applying solid state fermentation and utilizing corn flour as the sole carbon source. The optimized culture conditions for dextranase productions were 37°C, pH 10, 32 h, and 20% (v/w) moisture content. A unique character of this isolate is its ability to produce steady dextranase irrespective to the presence of NaCl in the medium. The addition of 0.175 Mm CrCl3 increased the enzyme production by about 4.5 fold. Further improvement in enzyme production was achieved by simple UV mutation which increased the enzyme production up to about 2842 U/g. The crude extract has been partially purified about 112-fold from crude extract by only two purification steps involving ultra-filtration. The partially purified dextranase showed its maximum activity at pH 9.2 and 70°C. It retained full activity (100%) at 75°C for one hour. Dextranase activity increased about 4 fold in the presence of 10% NaCl. This enzyme showed variable degradation effect on different types of dextran and its derivatives. The treatment of viscous sugar cane juice with the enzyme preparation resulted in clear visual dextran hydrolysis. These results suggest that the dextranase produced by Bacillus subtilis NRC-B233b is industrially applicable.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/860619","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64361587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Comparison of Catalysts Preyssler and Silica-Supported Nano Preyssler in the Synthesis of Acetyl Salicylic Acid 催化剂Preyssler与二氧化硅负载纳米Preyssler合成乙酰水杨酸的比较

E-journal of Chemistry Pub Date : 2012-01-12 DOI: 10.1155/2012/892861

Hadiseh Nazari, A. Ahmadpour, F. Bamoharram, M. Heravi, N. Eslami

引用次数: 1

Direct Electrochemical Synthesis of Bismuth(III) Phenoxides and their Coordination Compounds 铋(III)苯氧化物及其配位化合物的直接电化学合成

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/403782

H. Kaur, Baljit Singh

引用次数: 3

Production of oleic acid based wax ester using acidic homogeneous catalysts 酸性均相催化剂制备油酸基蜡酯

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/181249

Naowara M. Al-Arafi, J. Salimon

{"title":"Production of oleic acid based wax ester using acidic homogeneous catalysts","authors":"Naowara M. Al-Arafi, J. Salimon","doi":"10.1155/2012/181249","DOIUrl":"https://doi.org/10.1155/2012/181249","url":null,"abstract":"Four homogeneous acidic catalysts were tested for their ability to catalyze the esterification reaction of oleic acid and oleyl alcohol to produce oleyl oleate, a wax ester. Sulfuric acid showed relatively higher specific activity. Various reaction parameters were optimised to obtain high percentage yield of oleyl oleate. The optimum condition to produce oeyl oleate was reaction time; 5 h, temperture; 90°C, amount of sulforic acid 0.15 g and molar ratio of oleyl alcohol to oleic acid; 1:1. Percentage yield of wax ester obtained at these optimum reaction conditions was 93.88. Disappearance of carboxylic acid (C=O) peak has confirmed by FTIR with appearance of ester (C=O) peak at 1739 cm−1. 1H NMR spectra analyses confirmed the result of oleyl oleate with appearance of ester (-CH2OCOR) at 4.02 ppm and also the 13C-NMR confirmed the result with appearance of ester (C=O) peak at 173.2 ppm. The low-temperture behavior of compound synthesized was determined through its pour point (PP), viscosity index (VI) and flash point (FP) values. The results showed that oleyl oleate exhibited the most favorable low-temperture performance of PP, VI and FP with −31°C, 197.5 and 320°C respectively. This is due to increase of the molacular weight thus improve the low temperture property significantly.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/181249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64299670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

The Effects of Silica/Carbon Black Ratio on the Dynamic Properties of the Tread compounds in Truck Tires 二氧化硅/炭黑配比对载重轮胎胎面胶动态性能的影响

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/571957

R. Zafarmehrabian, Saeed Taghvaei Gangali, M. Ghoreishy, Mehran Davallu

引用次数: 59

Solvent-Free Synthesis of 1,8-Dioxo-octahydroxanthenes and 14-Aryl-14H-dibenzo[a,j]xanthenes using Saccharin SulfonicAcid as an Efficient and Green Catalyst 糖精磺酸催化无溶剂合成1,8-二氧八羟基蒽和14-芳基- 14h -二苯并[a,j]杂蒽

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/596862

A. Zare, M. Mokhlesi, A. Hasaninejad, Tahereh Hekmat-Zadeh

引用次数: 12

Thermodynamic and Isotherm Analysis on the Removal of Malachite Green Dye Using Thespesia Populnea Bark 白杨树皮脱除孔雀石绿染料的热力学及等温线分析

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/629089

R. Prabakaran, S. Arivoli

引用次数: 8