scholarly journals Sulfonation of Natural Carbonaceous Bentonite as a Low-Cost Acidic Catalyst for Effective Transesterification of Used Sunflower Oil into Diesel; Statistical Modeling and Kinetic Properties

ACS Omega ◽  
2021 ◽  
Author(s):  
Walaa A. Hassan ◽  
Ezzat A. Ahmed ◽  
Mohamed A. Moneim ◽  
Mohamed S. Shaban ◽  
Ahmed M. El-Sherbeeny ◽  
...  
Keyword(s):  
Statistical Modeling ◽  
Sunflower Oil ◽  
Low Cost ◽  
Kinetic Properties ◽  
Acidic Catalyst

Immobilization of Eversa Lipases on Hydrophobic Supports for Production of Oleate Esters Solvent-Free

2021 ◽  
Author(s):  
Gloria Fernandez-Lorente ◽  
Daniela Remonatto ◽  
J. Vladimir Oliveira ◽  
J. Manuel Guisan ◽  
Débora Oliveira ◽  
...  
Keyword(s):  
Sunflower Oil ◽  
Low Cost ◽  
Industrial Applications ◽  
Solvent Free ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Promising Alternative ◽  
Highly Active ◽  
Immobilized Biocatalyst ◽  
Hydrophobic Supports

Abstract Lipases are an important group of biocatalysts for many industrial applications. Two new commercial low-cost lipases Eversa® Transform and Eversa® Transform 2.0 was immobilized on four different hydrophobic supports: Lewatit-DVB, Purolite-DVB, Sepabeads-C18, and Purolite-C18. The performance of immobilized lipases was investigated in the transesterification of sunflower oil solvent-free in an anhydrous medium. Interesting results were obtained for both lipases and the four supports, but with Sepabeads support the lipases Eversa showed high catalytic activity. However, the more stable and efficient derivative was Eversa® Transform immobilized on Sepabeads C-18. A 98 wt% of ethyl ester of fatty acid (FAEE) was obtained, in 3 hours at 40ºC, ethanol/sunflower oil molar ratio of 3:1 and a 10 wt% of the immobilized biocatalyst. After 6 reaction cycles, the immobilized biocatalyst preserved 70 wt% of activity. Both lipases immobilized in Sepabeads C-18 were highly active and stable in the presence of ethanol. The immobilization of Eversa Transform and Eversa Transform 2.0 in hydrophobic supports described in this study appears to be a promising alternative to the immobilization and application of these news lipases still unexplored.

In-line measurement of sunflower oil color in the Lovibond scale using a low-cost robust device

2014 ◽  
Vol 120 ◽  
pp. 88-93 ◽  
Author(s):  
Cristian R. Muzzio ◽  
Rodolfo J. Díaz ◽  
Nicolás G. Dini
Keyword(s):  
Sunflower Oil ◽  
Low Cost ◽  
Line Measurement ◽  
Oil Color ◽  
Lovibond Scale

scholarly journals Profitability of sunflower cultivation in some selected sites of Bangladesh

2016 ◽  
Vol 41 (4) ◽  
pp. 599-623 ◽  
Author(s):  
M Khatun ◽  
Tanvir MB Hossain ◽  
MA Monayem Miah ◽  
S Khandoker ◽  
MA Rashid
Keyword(s):  
Sunflower Oil ◽  
Sunflower Seed ◽  
Low Cost ◽  
Stochastic Frontier ◽  
Edible Oil ◽  
Current Level ◽  
Organic Fertilizers ◽  
Land Type ◽  
Female Farmers ◽  
One Year

The study was conducted in Bogra and Satkhira districts to assess the socioeconomic status, profitability, problems and prospects of sunflower cultivation in Bangladesh. A total of 100 sunflower cultivating farmers, taking 50 farmers from each district, were randomly selected for this study. About 18% female farmers were also found to cultivate sunflower due to its beauty and easy cultivation method. Majority of the farmers had only one year experience of sunflower cultivation. Per hectare cost of producing sunflower was estimated as Tk. 62,199. Per hectare net return and BCR were Tk. 10,863 and 1.18, respectively which indicated that sunflower cultivation was profitable. Stochastic frontier function revealed that the use of labour, seed, organic fertilizers, cost of irrigation, and land type had positive and significant effect on the yield of sunflower. Average technical efficiency of the farmers was 86% which implies that there is a scope of increasing productivity of sunflower by 14% using current level of inputs by increasing the farmers’ efficiency. Lack of irrigation facility, scarcity of seed on time, absence of sunflower oil mill and sunflower market, low demand for sunflower, high cost of seed, etc. were the major problems of sunflower production and marketing. In spite of having some problems 18% female farmers became interested to cultivate and 46% farmers of Satkhira district mentioned that their demand for edible oil is becoming fulfil. So there is great potentiality of sunflower cultivation in Bangladesh. The availability of sunflower seed with low cost and establishment of sunflower oil mill is needed to sustain this crop in Bangladesh. Therefore, import dependency on soybean oil will be reduced.Bangladesh J. Agril. Res. 41(4): 599-623, December 2016

Mesoporous tantalum phosphate as acidic catalyst for the methanolysis of sunflower oil

2012 ◽  
Vol 123-124 ◽  
pp. 316-323 ◽  
Author(s):  
I. Jiménez-Morales ◽  
J. Santamaría-González ◽  
P. Maireles-Torres ◽  
A. Jiménez-López
Keyword(s):  
Sunflower Oil ◽  
Acidic Catalyst

scholarly journals -SO3H-functionalization of sub-bituminous coal as a highly active acidic catalyst during the transesterification of spent sunflower oil; characterization, application, and mechanism

2021 ◽  
Vol 7 ◽  
pp. 8699-8710
Author(s):  
Sherouk M. Ibrahim ◽  
Ahmed M. El-Sherbeeny ◽  
Jae-Jin Shim ◽  
Ali A. AlHammadi ◽  
Mostafa R. Abukhadra
Keyword(s):  
Sunflower Oil ◽  
Bituminous Coal ◽  
Acidic Catalyst ◽  
Highly Active ◽  
Oil Characterization

scholarly journals Theoretical and Experimental Considerations for a Rapid and High Throughput Measurement of Catalase In Vitro

Antioxidants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Ouardia Bendou ◽  
Ismael Gutiérrez-Fernández ◽  
Emilio L. Marcos-Barbero ◽  
Nara Bueno-Ramos ◽  
Ana I. González-Hernández ◽  
...  
Keyword(s):  
High Throughput ◽  
Catalase Activity ◽  
Initial Rate ◽  
Low Cost ◽  
Rate Equations ◽  
Small Scale ◽  
Kinetic Properties ◽  
H2o2 Decomposition ◽  
Suicide Inactivation

A rapid and high throughput protocol to measure the catalase activity in vitro has been designed. Catalase is an enzyme with unusual kinetic properties because it does not follow the standard Michaelis–Menten model and is inactivated by H2O2. This makes the analysis of the two rate equations of the second-ordered reactions of the kinetic model rather complex. A two-degree polynomial fitting of the experimental data is proposed after transforming the exponential form of the integrated rate equation of the [H2O2] into a polynomial using the Taylor series. The fitting is validated by establishing an experimental linear relationship between the initial rate of the H2O2 decomposition and the protein concentration, regardless of the suicide inactivation that catalase might undergo beyond t > 0. In addition, experimental considerations are taken into account to avoid statistical bias in the analysis of the catalase activity. ANOVA analyses show that the proposed protocol can be utilized to measure the initial rate of the H2O2 decomposition by catalase in 32 samples in triplicates if kept below 8 mM min−1 in the microplate wells. These kinetic and statistical analyses can pave the way for other antioxidant enzyme activity assays in microplate readers at small scale and low cost.

New Compositions of Metal-Working Coolants for Brass Rolling

2018 ◽  
Author(s):  
Anatoly P. Avdeenko ◽  
Mykhailo V. Fedorynov ◽  
Predrag V. Dašić ◽  
Raul Turmanidze ◽  
Konstantin S. Burmistrov ◽  
...  
Keyword(s):  
Sunflower Oil ◽  
High Efficiency ◽  
Low Cost ◽  
Oil Production ◽  
Waste Recycling ◽  
Metal Working ◽  
Stretch Forming ◽  
Strip Rolling ◽  
Steel Rolling ◽  
Zinc Alloys

The efficiency of cold steel rolling depends mainly on the quality of the metal-working coolant (MWC) and its cost. In this connection, it is actual to search for new compositions of lubricants and emulsions, which provide the lowest values of the friction coefficients in deformation zone and are obtained by waste recycling in other industries. In this study we have developed new compositions of the MWC on basis of mono- and diglycerides and their esters of boric acid synthesized from the wastes of sunflower oil production. The new compositions of MWC were tested in DSEA on laboratory rolling mill 100x100 with a roll diameter of 100 mm. The efficiency of new MWC during cold rolling of brass L63 samples was determined by factor of metal stretch forming λ. We found the new metal-working coolants to show the most efficiency under higher cobbing that provides the highest metal stretch forming. The composition with 30 % of mono- and diglycerides is the most effective because it provides the minimum coefficient of friction that leads to increase of factor of metal stretch forming. Thereby the metal-working coolants on basis of mono- and diglycerides obtained from the wastes of sunflower oil production can be recommended for use in strip rolling of copper-zinc alloys because of a low cost, availability and high efficiency.

scholarly journals Noninvasive Evaluation of Intestinal Lactase with 4-Galactosylxylose: Comparison with 3- and 2-Galactosylxylose and Optimization of the Method in Rats

2006 ◽  
Vol 52 (2) ◽  
pp. 270-277 ◽  
Author(s):  
Carmen Hermida ◽  
Guillermo Corrales ◽  
Oscar H Martínez-Costa ◽  
Alfonso Fernández-Mayoralas ◽  
Juan J Aragón
Keyword(s):  
Small Intestine ◽  
Low Cost ◽  
Noninvasive Evaluation ◽  
Kinetic Properties ◽  
Dependent Manner ◽  
Lactase Activity ◽  
Suckling Rats ◽  
In Vivo Measurement ◽  
Intestine Mucosa

Abstract Background: Urinary excretion of d-xylose by suckling rats after ingestion of a mixture of 4-, 3-, and 2-galactosylxyloses reflects lactase activity in vivo. We aimed to select the most convenient of these disaccharides for detecting changes of the enzyme activity in vivo and to optimize the method. Methods: 4-, 3-, and 2-Galactosylxyloses were synthesized and purified, then orally administered to suckling rats of different ages. d-Xylose was measured colorimetrically by the phloroglucinol reaction in urine and plasma. Lactase activity was determined in extracts of small intestine mucosa with lactose, galactosylxyloses, and phlorizin as substrates. Results: d-Xylose appeared in the urine in a dose-dependent manner after ingestion of any of the 3 galactosylxylose disaccharides. Correlation between d-xylose elimination and intestinal lactase activity was highest with 4-galactosylxylose (r = 0.97; n = 24), lower with 2-galactosylxylose (r = 0.89; n = 24), and lowest with 3-galactosylxylose (r = 0.34; n = 23). The kinetic properties of intestinal lactase accounted for these differences. d-Xylose concentration in plasma after administration of 4-galactosylxylose also correlated with lactase activity (r = 0.93; n = 33). Conclusions: 4-Galactosylxylose is the most suitable compound for the evaluation of lactase activity in vivo. Measurement of the derived d-xylose in either urine or blood gives an estimate of the total lactose digestive capacity of the small intestine. The optimized method holds promise for development of a simple, low-cost, and reliable new test for the noninvasive diagnosis of hypolactasia.

Selective anomeric deacetylation using zinc acetate as catalyst

2012 ◽  
Vol 66 (4) ◽  
Author(s):  
Eda Kaya ◽  
Fatih Sonmez ◽  
Mustafa Kucukislamoglu ◽  
Mehmet Nebioglu
Keyword(s):  
Zinc Acetate ◽  
Low Cost ◽  
Zinc Acetate Dihydrate ◽  
Environmentally Benign ◽  
Acetate Dihydrate ◽  
Acidic Catalyst ◽  
Mild Conditions ◽  
Alternative Method ◽  
Benign Nature

AbstractAn alternative method has been developed for the anomeric deacetylation of fully acetylated carbohydrate derivatives using zinc acetate dihydrate as a catalyst in methanol under mild conditions. The experimental simplicity, low cost, acceptable yield, use of a readily handled acidic catalyst, and the environmentally benign nature are some of the advantages of this method.

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