Determination of Main Parameters Affecting Ozone Bleaching of Wheat Straw Pulp Using Plackett–Burman Design

2017 ◽  
Vol 40 (2) ◽  
pp. 148-156 ◽  
Author(s):  
Sandeep Kumar Tripathi ◽  
Nishi Kant Bhardwaj ◽  
Himadri Roy Ghatak
Keyword(s):  
Wheat Straw ◽  
Wheat Straw Pulp ◽  
Burman Design ◽  
Plackett Burman Design ◽  
Ozone Bleaching

scholarly journals Plackett-Burman design in robustness testing of liquid chromatographic method for determination of sodium-valproat

2014 ◽  
Vol 64 (2) ◽  
pp. 128-143
Author(s):  
Slavica Kojic-Marinkovic ◽  
Mihaela Tumbas ◽  
Tijana Rakic ◽  
Biljana Jancic-Stojanovic
Keyword(s):  
Chromatographic Method ◽  
Robustness Testing ◽  
Liquid Chromatographic Method ◽  
Burman Design ◽  
Liquid Chromatographic ◽  
Plackett Burman Design

scholarly journals Melamine Recognition: Molecularly Imprinted Polymer for Selective and Sensitive Determination of Melamine in Food Samples

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Mohadese Biabani ◽  
Azizollah Nezhadali ◽  
Ahmad Nakhaei ◽  
Hossein Nakhaei
Keyword(s):  
Limit Of Detection ◽  
Electrochemical Techniques ◽  
Food Samples ◽  
Quantitative Measurements ◽  
Sensitive Determination ◽  
Burman Design ◽  
Mip Sensor ◽  
Optimized Conditions ◽  
Plackett Burman Design

In this study, a sensitive and selective sensor is constructed to measure the melamine (MEL) using molecular imprinting polymer (MIP) technique. Chemical and electrochemical techniques are used to construct the MIP and quantitative measurements. The constructed sensor was modified with GO-Fe3O4@SiO2 nanocomposite. Screening and optimization of factors are done using statistical methods, including Plackett–Burman design (PBD) and central composite design (CCD). Under the optimized conditions, an MIP sensor showed a linear range from 5.0 × 10−7 to 1.0 × 10−5 M MEL concentration with a correlation coefficient (R2) of 0.9997. The limit of detection was obtained (0.028 µM) with a highly reproducible response (RSD 2.15%, n = 4). The electrochemical sensor showed good results for the determination of MEL in food samples.

Improvement in selectivity of ozone bleaching using DTPA as carbohydrate protector for wheat straw pulp

2019 ◽  
Vol 34 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Sandeep Kumar Tripathi ◽  
Nishi Kant Bhardwaj ◽  
Himadri Roy Ghatak
Keyword(s):  
Wheat Straw ◽  
Morphological Properties ◽  
Ozone Treatment ◽  
Physical Strength ◽  
Bleached Pulp ◽  
Pulp Viscosity ◽  
Wheat Straw Pulp ◽  
Mn Content ◽  
And Control ◽  
Ozone Bleaching

Abstract Effect of using diethylenetriamine pentaaceticacid (DTPA) as carbohydrate protector in ozone stage on delignification efficiency, bleaching efficiency, selectivity, metal ions, strength, morphological properties and effluent properties of wheat straw pulp was studied. Using DTPA during ozone treatment viscosity of pulp was improved by 1.1 units, delignification efficiency improved by 13.8 % and pulp brightness improved by 2.5 units compared to that of control. Most importantly the selectivity of ozone treatment was improved by 124 %. Ozone treatment along with DTPA reduced the Fe, Cu and Mn content in the pulp by 52 %, 27 % and 70 %, respectively. Use of DTPA in ozone stage improved the bleached pulp viscosity by 9 %, post colour number by 27 % and reduced the pulp shrinkage by 5 % compared to control pulp. DTPA treated and control pulps have comparable physical strength and morphological properties.

Additives to decrease cellulose chain scission during ozone bleaching of wheat straw pulp

2018 ◽  
Vol 33 (3) ◽  
pp. 430-438 ◽  
Author(s):  
Sandeep Kumar Tripathi ◽  
Nishi Kant Bhardwaj ◽  
Himadri Roy Ghatak
Keyword(s):  
Acetic Acid ◽  
Wheat Straw ◽  
Sulfamic Acid ◽  
Chain Scission ◽  
Ammonium Molybdate ◽  
Ozone Treatment ◽  
Chemical Additives ◽  
Bleaching Efficiency ◽  
Wheat Straw Pulp ◽  
Ozone Bleaching

Abstract The efficacy of different chemical additives like acetic acid, ammonium molybdate, diethylene triamine pentaacetic acid (DTPA), mannitol, methanol, per acetic acid (PAA), sodium hypochlorite (NaOCl) and sulfamic acid as carbohydrate protector during ozone bleaching of wheat straw pulp was studied. DTPA was found the most effective additive for ozone bleaching followed by the methanol. Using DTPA during ozone treatment improved the delignification efficiency by 13.8 %, bleaching efficiency by 19.8 %, selectivity of ozone by 124 % and reduced the chain scission number of glycosidic linkages in cellulose by 55.3 % compared to that of control. Ozone treatment along with DTPA reduced the Fe, Cu and Mn content in the pulp by 52 %, 27 % and 70 %, respectively. Use of methanol improved the delignification efficiency by 9.0 %, bleaching efficiency by 12.2 %, selectivity by 32.4 % and reduced the chain scission number by 22.2 % compared to that of control. The NaOCl was found to be the most effective for improving the delignification efficiency followed by PAA, they improved the delignification efficiency by 29.3 % and 27.3 %, respectively. The PAA improved the bleaching efficiency to a maximum of 39.9 % followed by 30.2 % with NaOCl.

scholarly journals Development of Stability Indicating and Robust RP-HPLC Method for Determination of Teneligliptin

2018 ◽  
pp. 1-12
Author(s):  
Anvesha Vinit Ganorkar ◽  
Rekha S. Jibhkate ◽  
Krishna Radheshyam Gupta
Keyword(s):  
Limit Of Detection ◽  
Degradation Products ◽  
Hplc Method ◽  
Reverse Phase Hplc ◽  
Degradation Study ◽  
Ich Guidelines ◽  
Purity Analysis ◽  
Burman Design ◽  
Plackett Burman Design

A simple and rapid reverse-phase HPLC method was developed for determination of Teneligliptin (TGP) in the presence of its degradation products generated from forced decomposition studies. The HPLC separation was achieved on a C18 ACE column (150x 4.6 mm i.d.; 5 μm) using mobile phase as a mixture of Phosphate buffer pH-7.2 using ortho-phosphoric acid: methanol (30:70v/v). The UV detection was carried out at 245nm at ambient temperature and the flow rate of 1.0 mL/min. The calibration curve was found to be linear in the concentration range of 10-50 μg/mL(r=0.9993). Force degradation study was performed under various conditions like acidic, alkaline, oxidative, photolytic and mass balance calculations were carried out from the degradation results. The developed method was validated as per ICH guidelines with respect to linearity, accuracy, precision, limit of detection and quantification. The robustness of the proposed method was evaluated by the Plackett Burman design. The purity of the degraded sample was checked by peak purity analysis. The peaks of degradation products did not interfere with that of pure Teneligliptin.

scholarly journals Determination of Morin and Quercetin in Fruit Juice Samples using Air-Assisted Liquid-Liquid Microextraction Based on Solidification of Floating Organic Droplet and HPLC-UV

2020 ◽  
Vol 67 (4) ◽  
pp. 1092-1099
Author(s):  
Armin Fallah ◽  
Mohammad Reza Hadjmohammadi
Keyword(s):  
Fruit Juice ◽  
Limit Of Detection ◽  
Linear Calibration ◽  
Extraction Solvent ◽  
Relative Standard ◽  
Burman Design ◽  
Optimized Conditions ◽  
Plackett Burman Design ◽  
Liquid Microextraction

In this study, a rapid and efficient method has been used for the extraction and determination of morin and quercetin in fruit juice samples based on air-assisted liquid-liquid microextraction based on solidification of floating organic droplet and HPLC-UV. The effects of 7 important parameters on the extraction recovery were examined and were optimized by Plackett-Burman design and Central Composite design. According to the Plackett-Burman design results, ionic strength of the sample solutions, the aspiration/dispersion cycles, and the rate and time of centrifuge did not show significant effects on the extraction of morin and quercetin. The optimized conditions of extraction were as follows; the volume of the extraction solvent of 83.6 μL, pH of 4.34 for the sample, and 1-undecanol as extraction solvent. Under these conditions, the linear calibration curve was in the ranges of 1–1000 ng/mL and 0.5–1000 ng/mL for morin and quercetin, respectively, with the determination coefficient values above 0.99. The limit of detection of morin and quercetin was 0.3 and 0.2 ng/mL, respectively. The extraction recoveries for 10 ng/mL of morin and quercetin were 98.9% and 96.5%, respectively; while, relative standard deviations (n = 3) were lower than 3.2%.

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