Alkaline medium

The present work is a development simple, sensitive and selective spectrophotometric method for determination of amoxicillin in dosage forms. Based on the diazotization of aniline and sulfanilic acid with nitrite ion in acidic medium to colorless diazonium ion, which subsequently coupled with amoxicillin to form a colored azo dye in the alkaline medium.

7p vidoctorstrange 06-05-2023 6 2   Download

In this study, 7 new isoxazole compounds (8-14) were synthesized from the cyclization of chalcone compounds (1-7) containing different functional groups with hydroxylamine hydrochloride in alkaline medium. Tyrosinase and antioxidant properties of 8-14 were investigated. IC50 values for the tyrosinase enzyme inhibition of compounds 8, 11, 12, and 13 were varied between 61.47 ± 3.46 and 188.52 ± 5.85, while compounds 9, 10 and 14 did not show any inhibition effect.

22p lyhuyenthu 31-01-2023 4 2   Download

The high-, medium-, and low-amylose rice starches were isolated by the alkaline method and acetylated by using acetic anhydride for 10, 30, and 90 min of reaction. The degree of substitution (DS), the Fourier-transformed infrared spectroscopy (FTIR), the X-ray diffractograms, the thermal, morphological, and pasting properties, and the swelling power and solubility of native and acetylated starches were evaluated.

9p vihermione 06-01-2023 8 2   Download

Cellulose was extracted from brewer’s spent grain (BSG) by alkaline and bleaching treatments. The extracted cellulose was used in the preparation of carboxymethyl cellulose (CMC) by reaction with monochloroacetic acid in alkaline medium with the use of a microwave reactor.

9p vihermione 06-01-2023 13 2   Download

In the present work, a simple automated microplate method based on cupric ion reduction is described for determining total reducing sugars in food extracts and synthetic serum. The reaction of Cu(II)-Nc (cupric-neocuproine) with reducing sugars was performed in alkaline medium in microplates, and the absorbance of the formed highly colored Cu(I)-Nc chelate in a plate reader at 450 nm was recorded. The proposed method was applied to reducing sugars (glucose, fructose, galactose, maltose, and lactose) and their linear calibration curves were constructed.

14p tudichquannguyet 29-11-2021 11 1   Download

Modified mesoporous HZSM-5 catalysts were prepared by controlled desilication using a mixture of NaOH and TPAOH (tetrapropylammonium hydroxide) and impregnation of metals (Mn, Ce, and Ba) and metalloid B. The catalytic performances of all prepared catalysts for methanol to propylene (MTP) reaction were evaluated in a fixed bed reactor under atmospheric pressure at 480°C. The parent and modified catalysts were characterized by XRD, ICP-OES, FE-SEM, NH3 -TPD, FT-IR, BET, and TGA techniques.

23p tudichquannguyet 29-11-2021 8 1   Download

In this paper, a fast, cheap, simple, sensitive and selective spectrophotometric method based on high spin peroxo-Fe(III)-EDTA complex in the alkaline medium was developed for the determination of hydrogen peroxide (H2O2) in real water samples. The purple-coloured complex with a maximum absorbance at a wavelength of 525 nm was formed. Various parameters such as type of stabilizer reagent and its concentration, reaction time, Fe(III), EDTA and NH3 concentration were optimized. The method was confirmed with the Beer’s law with a molar absorption coefficient of 267.36 L mol−1cm −1 in the 8.

13p tudichquannguyet 29-11-2021 12 1   Download

Wool has disulphide bonds containing-hydrophobic external keratin layers, which act as a barrier for the modification through coating with hydrophilic materials. For that reason, in this work, to ensure a dense and homogenous conductive polymer coating onto the wool, the fabrics were subjected to the reduction process in the aqueous alkaline medium containing agents that can attack these disulphide bonds. Then, one of the polyaniline derivatives, poly(mtoluidine) (PMT), was coated onto wool by in situ polymerization of m-toluidine sulphate using ammonium persulfate (APS) as an oxidant.

16p tudichquannguyet 29-11-2021 9 1   Download

The kinetic pathway of oxidation of crotyl alcohol by sodium salt of N -chloro-4-methylbenzene sulphonamide (chloramine-T) in acidic and alkaline medium has been studied. The speciation of chloramine-T has been made to suggest a proper and reasonable reaction mechanism. The thermodynamic quantities such as activation energy and activation entropy are evaluated in acidic as well as in catalysed alkaline medium. An anticipated reaction mechanism has been suggested.

21p tudichquannguyet 29-11-2021 12 1   Download

In this study, with the aim of determining and assessing the influence of several culture conditions on the ligninolytic enzyme (LiP, MnP, and Lac) activity of bacteria, five lignin-degrading bacteria strains were isolated from two different soil samples and cultured on minimum salt medium agar containing alkaline lignin (MSML agar). Among the five isolated strains, DL1 and X3 expressed strong and stable ligninase enzyme activity at various temperature levels (30C, 37C, 50C, and 60C) and were selected for further study.

10p chauchaungayxua12 09-07-2021 26 1   Download

This study was undertaken in 2016- 2017 by Division of Soil Science and Agri. Chemistry, Ratnai College of Agriculture, Akluj, India. In this module of experiential learning students collected 101 soil samples from Malshiras tahsil and analysed physico-chemical and chemical properties of different soils. In physico-chemical analysis average pH 7.86 which is slightly alkaline in reaction, EC-0.544dS/m which safe in soluble salt concentration, O.C-0.47 % is low to medium and CaCO3- 4.15% which indicates calcareous condition.

13p cothumenhmong9 18-01-2021 9 2   Download

Nine typical pedons from Langate Block of Kupwara district during 2017 were selected and surveyed for the purpose of collection of soil samples. The soil samples processed and analyzed for different nutrients. Available Micro and Macro nutrients were determined using standard techniques. The overall results showed that the soils are near slightly acidic to moderate alkaline in reaction, low to medium in organic carbon. In general the soils The available nutrients Nitrogen and Potassium were low to medium with the mean values of 287.99 and 149.

9p trinhthamhodang1216 19-11-2020 10 1   Download

Alkaline keratinolytic protease producing Bacillus species was screened out from soil sample and characterized by studying morphological, cultural and biochemical properties. It was identified by using Burgey‟s manual of determinative bacteriology, identification flow charts as Bacillus alcalophilus. The isolate was employed for the production of alkaline protease by using production medium consisting of glucose and casein as carbon and nitrogen sources at pH 8.5 (Rao and Narasu, 2007).

15p dayhoctainha 10-09-2020 20 1   Download

Cogen ash, a by-product of sugar mills obtained during co-generation process to produce heat and electrical energy by burning bagasse and/or coal was used to study its effect on growth and yield of paddy. The experiment was conducted in two sites at Bharathinagar, K.M. Doddi, Mandya during kharif 2014 with 13 treatments replicated thrice using randomized complete block design. The cogen ash collected from M/s Sri Chamundeshwari Sugars Ltd. was used in the study was more of silt sized, alkaline in nature with medium EC.

7p trinhthamhodang7 31-08-2020 22 1   Download

Study was conducted to evaluate soil fertility status in the four different tasar growing regions in Banka District of Bihar and Dumka District of Jharkhand. A total of 75 surface soil samples (0-30 cm) were collected from the fields of primary tasar food plants (Terminalia arjuna and T. tomentosa) along with the details regarding farmer’s name, land type, fertilizer details, geo location, etc. The collected samples were air dried, sieved and analyzed for various soil fertility parameters such as pH, EC, organic carbon, macro and micro nutrients etc.

9p angicungduoc6 20-07-2020 13 1   Download

The present investigation entitled “Fertility status of irrigated soils of Jhotwara panchayat samiti of Jaipur district “was carried out during 2010-11. The soils were pH neutral to alkaline (pH 7.2–8.5) in reaction having electrical conductivity (EC) value in surface soil (0.53–2.51 dSm-1 ). The data on nutrient showed that the soils are low in organic carbon and available nitrogen and low to medium in available phosphorus and available sulphur whereas, medium to high in available potassium.

8p chauchaungayxua6 26-06-2020 19 1   Download

The experimental soil was clay in texture, slightly alkaline in reaction, medium in available nitrogen, phosphorus and potassium. The results revealed that seed rate of 45kg/ha recorded maximum dry matter accumulation at 40 DAS and at harvest. The percent increase in green and dry fodder yield of this seed rate over seed rate of 30 and 35 kg/ha were 14.21, 21.91 and 7.41, 11.02 respectively. Seed rate of 45kg/ha recorded significantly higher N and P uptake over 40, 35 and 30 seed rate/ha but N and P content did not influence significantly by increased seed rate.

17p nguaconbaynhay6 24-06-2020 12 1   Download

A red pigment producing bacteria was isolated from soil sample which was identified by 16S r RNA sequencing as Serratia rubidaea JCM 1204T. The red pigment produced was tested for prodigiosin by presumptive color test, adsorption spectra, and its quantification was carried out on King’s B medium. For presumptive color test, the extracted pigment solution was divided into two portions. One part was acidified with a drop of concentrated HCl and the other part was alkalinized with a drop of concentrated ammonia solution.

12p nguaconbaynhay6 23-06-2020 11 0   Download

A field was conducted at Experimental Farm, Agronomy Section, College of Agriculture, Latur. The experimental field was levelled and well drained. The soil was medium and black in colour with good drainage. The soil was clayey in nature and slightly alkaline (7.8) in reaction, low in nitrogen (118.86 kg ha-1 ), medium in available phosphorus (17.7 kg ha-1 ) and rich in available potassium485.89 kg ha-1 ). The environmental conditions were favorably congenial for normal growth and maturity of pigeonpea crop.

5p trinhthamhodang1213 02-06-2020 27 1   Download

The present work deals with the dyeing of mulberry silk yarns with Artocarpus lacucha to develop variety of harmonizing natural shades using copper sulphate, ferrous sulphate and stannous chloride as mordants. The dyes were extracted in acid, alkaline and neutal medium and dyeing was performed at 70°C. The extent of dyeing was studied on the basis of dye uptake as well as K/S values. Highest dye intensity was obtained when alkaline medium was used for dye extraction. The mordant enhances the fastness properties.

11p trinhthamhodang1213 29-05-2020 10 2   Download