scholarly journals The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3671 ◽  
Author(s):  
Michał Moritz ◽  
Małgorzata Geszke-Moritz
Keyword(s):  
Surface Modification ◽  
Adsorption Capacity ◽  
Raw Materials ◽  
Porous Silica ◽  
Bioactive Compound ◽  
Glycyrrhetinic Acid ◽  
Plant Materials ◽  
Nonlinear Fitting ◽  
Pentacyclic Triterpenoid ◽  
Vegetable Raw Materials

This study aimed at the adsorption of 18β-glycyrrhetinic acid (18β-GA), a pentacyclic triterpenoid derivative of oleanane type, onto functionalized mesoporous SBA-15 silica and non-porous silica (Aerosil®) as the reference adsorbent. Although 18β-GA possesses various beneficial pharmacological properties including antitumor, anti-inflammatory, and antioxidant activity, it occurs is small amounts in plant materials. Thus, the efficient methods of this bioactive compound enrichment from vegetable raw materials are currently studied. Siliceous adsorbents were functionalized while using various alkoxysilane derivatives, such as (3-aminopropyl)trimethoxysilane (APTMS), [3-(methylamino)propyl]trimethoxysilane (MAPTMS), (N,N-dimethylaminopropyl)trimethoxysilane (DMAPTMS), and [3-(2-aminothylamino)propyl] trimethoxysilane (AEAPTMS). The effect of silica surface modification with agents differing in the structure and the order of amine groups on the adsorption capacity of the adsorbent and adsorption efficiency were thoroughly examined. The equilibrium adsorption data were analyzed while using the Langmuir, Freundlich, Redlich-Peterson, Temkin, Dubinin-Radushkevich, and Dubinin-Astakhov isotherms. Both linear regression and nonlinear fitting analysis were employed in order to find the best-fitted model. The adsorption isotherms of 18β-GA onto silicas functionalized with APTMS, MAPTMS, and AEAPTMS indicate the Langmuir-type adsorption, whereas sorbents modified with DMAPTMS show the constant distribution of the adsorbate between the adsorbent and the solution regardless of silica type. The Dubinin-Astakhov, Dubinin-Radushkevich, and Redlich-Peterson equations described the best the process of 18β-GA adsorption onto SBA-15 and Aerosil® silicas that were functionalized with APTMS, MAPTMS, and AEAPTMS, regardless of the method that was used for the estimation of isotherm parameters. Based on nonlinear fitting analysis (Dubinin-Astakhov model), it can be concluded that SBA-15 sorbent that was modified with APTMS, MAPTMS, and AEAPTMS is characterized by twice the adsorption capacity (202.8–237.3 mg/g) as compared to functionalized non-porous silica (118.2–144.2 mg/g).

scholarly journals Enhancement of the Congo Red Adsorption Capacity of Biochars by Surface Modification with MgCl2 Pretreatment

2020 ◽  
Vol 42 (10) ◽  
pp. 472-481
Author(s):  
Hee So Oh ◽  
Jae-Soo Chang
Keyword(s):  
Surface Modification ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Congo Red ◽  
Raw Materials ◽  
Physicochemical Characteristics ◽  
Pine Sawdust ◽  
Adsorption Capacities ◽  
Initial Ph ◽  
Surface Modified

Objectives : The physicochemical characteristics of Mg-biochar composites derived from kelp and pine after pretreatment with MgCl2 were analyzed, and their adsorption capacities for an anionic dye, Congo red (CR), were evaluated.Methods : After pretreating 60 g of kelp and pine sawdust in 1 L of 0.1 M MgCl2･6H2O, the raw materials were pyrolyzed at 500℃ to produce Mg-biochar composites (kelp based KB-Mg and pine based PB-Mg). The fundamental physicochemical characteristics of the Mg-biochar composites were examined, and their adsorption capacities for CR were investigated using different initial pH values, adsorption kinetic models, and adsorption isotherm models.Results and discussion : The Mg-biochar composites showed the development of uniform deposits of Mg minerals primarily as MgO crystal on the surface by the surface modification with MgCl2. When the pristine biochars were surface-modified with MgCl2, their adsorption capacities for CR were significantly increased over the entire pH range tested. The CR adsorption process by all biochars was best described with the pseudo-first order kinetics model, and the adsorption isotherm characteristics were better described with the Langmuir isotherm model for all biochars. The Langmuir maximum adsorption capacities for KB-Mg and PB-Mg were 423.0 mg/g and 394.7 mg/g, respectively. It is suggested that the main mechanism for CR adsorption on the Mg-biochars is electrostatic attraction between CR and the biochars.Conclusions : The results showed that surface modification with MgCl2 could greatly enhance the CR adsorption capacity of biochars, and the results demonstrated the great potential of KB-Mg and PB-Mg for CR removal.

scholarly journals THE EFFECT OF STORAGE CONDITIONS ON THE PROPERTIES OF AQUEOUS SOLUTIONS OF CARBOXYMETHYLATED PLANT MATERIALS

2018 ◽  
pp. 309-317 ◽  
Author(s):  
Елена (Yelena) Владимировна (Vladimirovna) Калюта (Kalyuta) ◽  
Вадим (Vadim) Иванович (Ivanovich) Маркин (Markin) ◽  
Михаил (Mikhail) Ильич (Il'ich) Мальцев (Mal'tsev)
Keyword(s):  
Plant Growth ◽  
Aqueous Solutions ◽  
Agricultural Production ◽  
Raw Materials ◽  
Storage Conditions ◽  
Freezing And Thawing ◽  
Plant Materials ◽  
Plant Raw Materials ◽  
Urgent Task ◽  
Vegetable Raw Materials

The development of new plant growth regulators based on products of chemical processing of plant raw materials is currently an urgent task for increasing yields in agricultural production. On the basis of carboxymethylated plant materials, "Eco-Stim" plant growth regulator has been developed. The purpose of this work is to study the effect of the storage conditions of solutions of carboxymethylated plant materials in "Eco-Stim" as part of the preparation on their rheological and growth-regulating properties. The rheological properties of the aqueous systems of carboxymethylated pine, sunflower, and oat chaff have been studied at concentrations of 0.2–15%. It is established that the change in viscosity as a result of the shear rate of the systems studied is more complex in comparison with aqueous solutions of Na-CMC. Storage of solutions of carboxymethylated vegetable raw materials for 20 months, as well as the processes of freezing and thawing for 6–9 weeks have practically no effect on the viscosity and growth regulating properties of carboxymethylated vegetable raw materials. The studied systems make it possible to increase the germination of wheat seeds Omskaya-36 to 80–87% and to increase the length of the root by 4–10 times and the stem by 1.5–2 times compared to the control.

scholarly journals ANALYSIS OF METHODS OF WASHING FOOD VEGETABLE RAW MATERIALS

2020 ◽  
pp. 37-43
Author(s):  
Oleksandr Gladushnyak ◽  
Oleksandr Vsevolodov
Keyword(s):  
Technological Process ◽  
Raw Materials ◽  
High Energy ◽  
Clean Water ◽  
Two Stage ◽  
Plant Materials ◽  
Running Water ◽  
Root Crops ◽  
Washing Machines ◽  
Vegetable Raw Materials

The article is devoted to the issues of rational consumption of clean water for carrying out the technological process of washing vegetable raw materials, as well as finding out the reasons for the high energy costs of the technological process of washing. The requirements of state standards that are presented to raw materials supplied to canning enterprises for the processing and production of canned foods are described. The amount of soil contamination and the number of microorganisms that are allowed by the relevant standards on the surface of root crops are indicated. It also indicates the inadmissibility of using water that does not meet the requirements of the standards. The modern equipment of the world leading manufacturers of equipment for washing plant materials and some domestic manufacturers is considered. The main directions of using clean water for the technological process of washing vegetable raw materials are considered. The amount of clean running water used for washing is indicated, which on average exceeds 1.5 ... 2 times that accepted in industry. The characteristics of some modern washing machines are given, the reasons for the increased clean water consumption, as well as the drive power of the washing machines, are described. The average value of specific electricity consumption per 1 kg of washed raw material is given. To solve the issues of rational consumption of clean running water, as well as reducing power to drive washers, a technological process that uses a two-stage washer with a section of "dry washing" of vegetable raw materials is proposed. By coordinating the washing regimes in the two-stage method, it is possible to significantly reduce both the flow rate of clean running water and the energy consumption for the washing process of raw materials. The article shows a diagram of a universal two-stage washer for washing plant materials, in particular root crops. The proposed method and design of the machine that implements this method are protected by the patent of Ukraine No. 107488 for the invention.

scholarly journals Features of application of biologically valuable vegetable raw materials of Skolivschina in galician cuisine dishes preparation

2021 ◽  
Vol 23 (96) ◽  
pp. 82-87
Author(s):  
M. Ya. Bomba ◽  
S. V. Maykova ◽  
І. S. Romashko ◽  
N. P. Shemedyuk
Keyword(s):  
Consumer Preferences ◽  
Raw Materials ◽  
Partial Replacement ◽  
Plant Materials ◽  
Biological Value ◽  
Oxalis Acetosella ◽  
National University ◽  
Traditional Vegetable ◽  
Materials Used ◽  
Vegetable Raw Materials

The paper considers the peculiarities of the non-traditional vegetable raw materials of Skolivshchyna in the production of Galician cuisine with health-improving properties. We studied the experience of scientists in improving the quality of food and increasing their biological value through the addition of functional plant materials. The authors of the article described the results of the improvement of three dishes of Ukrainian cuisine, in the recipes of which there are non-traditional vegetable raw materials of high nutritional and biological value. This is a characteristic feature of modern trends in the food industry, which supports the main trends of rational and healthy eating and allows you to adapt traditional Ukrainian dishes to the consumer preferences of today's residents. The publication substantiates the use of Agropyrum repens, Urtica dioica L. and Oxalis acetosella as raw components of updated dishes. The aim of the work was to improve the technology of cooking Galician cuisine with partial replacement of several traditional recipe components. The research was conducted on the basis of the Department of Hotel and Restaurant Business and Food Technologies of Ivan Franko Lviv National University. The raw materials used met the quality and safety requirements of current regulations.

scholarly journals Methods of Getting Activated Carbon From Plant Materials

2019 ◽  
Vol 6 (12) ◽  
pp. 268-273
Author(s):  
A. Mamyshov
Keyword(s):  
Activated Carbon ◽  
Environmental Stress ◽  
Activated Charcoal ◽  
Raw Materials ◽  
Natural Compounds ◽  
The Other ◽  
Raw Material ◽  
Plant Materials ◽  
Vegetable Raw Materials ◽  
The One

This article is devoted to the production of activated carbon from vegetable raw materials. Due to the environmental stress, the problem of obtaining and searching for new sorbents, as well as the development of new sorption technologies, is urgent. Of particular interest are many tonnage production, such as, for example, timber processing and chemical industries. The latter is due to two reasons. On the one hand, the technologies of these industries are burdened with significant waste. On the other — wood and its components, natural compounds are the raw material for sorbents, and a unique sorbent is activated charcoal.

scholarly journals OBTAINING GRANULATED ACTIVE CARBON FROM WASTES OF VEGETABLE RAW MATERIALS

2018 ◽  
Vol 61 (3) ◽  
pp. 51 ◽  
Author(s):  
Еlena A. Farberova ◽  
Elena A. Tingaeva ◽  
Anna D. Chuchalina ◽  
Asiya R. Kobeleva ◽  
Andrei S. Maximov
Keyword(s):  
Heat Treatment ◽  
Activated Carbon ◽  
Porous Structure ◽  
Active Carbon ◽  
Raw Materials ◽  
Phenol Formaldehyde ◽  
Granular Activated Carbon ◽  
Preliminary Heat Treatment ◽  
Plant Materials ◽  
Vegetable Raw Materials

In the processes of agricultural products production a sufficiently large amount of solid wastes which contain high molecular weight hydrocarbons such as lignin, cellulose, etc. is accumulated. However, such wastes are rarely used to produce active carbons, and only technologies with their use for obtaining crushed or powdered sorption materials are known. In the industrial production of granular activated carbon the fossil coals are mainly used. In this work, research was conducted on the development of methods for producing granulated active carbon of spherical form. And the characteristics of their porous structure were studied. The process of granulation of the spherical shape of sorbents was carried out by liquid dispersing composition containing pulverized wastes of vegetable origin and a binder. As plant materials we used walnut shells and peanuts, apricot seed, buckwheat husk, and for comparison, the dust caking coal of SSOM brand. As a binder a phenol formaldehyde resin was used. To remove volatile substances of plant the raw material was subjected to preliminary heat treatment without access of air in a muffle furnace at optimum temperature which was determined by thermogravimetry. Crushed carbon material was mixed with a binder component in a weight ratio of 1:5 and was sprayed into a solution of sulfuric acid with a concentration of 30-35% for the curing of the pellets. The obtained pellets were soaked in acid solution for 24-30 h, were separated from the liquid, were washed with distilled water to pH = 5-6, and were dried first in air and were subjected to heat treatment. The result of the research shows the possibility of regulation of characteristics of the porous structure of the spherical granular activated carbon depending on the plant material. The resulting spherical granules of activated carbon have developed  system of micro - and mesopores. Depending on the type of plant waste the received active carbon has a radius of micropores in the range of (0.527-0.635) nm and maximum sorption volume varied from 0.46 to 0.71 cm3/g.Forcitation:Farberova E.A., Tingaeva E.A., Chuchalina A.D., Kobeleva A.R., Maximov A.S. Obtaining granulated active carbon from wastes of vegetable raw materials. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 51-57

Fruit and berry raw materials is a promising source of food ingredients for flour confectionery.

2020 ◽  
Vol 29 (11) ◽  
pp. 45-49
Author(s):  
L.N. Fedyanina ◽  
◽  
E.S. Smertina ◽  
V.A. Lyakh ◽  
A.E. Elizarova ◽  
...  
Keyword(s):  
Dietary Fiber ◽  
Scientific Literature ◽  
Consumer Demand ◽  
Raw Materials ◽  
Plant Materials ◽  
Food Ingredients ◽  
Promising Source

The article considers the problem of improving the range of confectionery from the standpoint of use plant materials of satisfaction by consumer demand in dieteticpreventive foods. The analysis of domestic and foreign scientific literature on promising directions of improving the range of dietetic-preventive confectionery is given. It is noted that in the recipes for flour confectionery introduced from non-traditional raw materials containing dietary fiber.

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