scholarly journals Bioactive textiles obtained by applying cinnamon essential oil-based emulsions

2020 ◽  
Author(s):  
Laura Chirila ◽  
Alina Popescu ◽  
Sabina Olaru ◽  
Angela Danila ◽  
Rodica Roxana Constantinescu ◽  
...  
Keyword(s):  
Essential Oil ◽  
Ostwald Ripening ◽  
Volume Fraction ◽  
Stability Index ◽  
Point Of View ◽  
Textile Materials ◽  
Stability Point ◽  
Experimental Variant ◽  
Cinnamon Essential Oil ◽  
The Stability

In order to obtain biomaterials with potential use in the treatment of inflammatory skin conditions, this experimental study approached the immobilization on knitted fabric, made of 100% organic cotton, of oil-in-water emulsions type, based on xanthan-propolis-cinnamon essential oil, in certain formulations. For this purpose, seven experimental variants of emulsions were prepared and characterized, by specific methods, from physical-chemical and stability point of view. The functionalized textile materials were also characterized from morphological and antibacterial activity view point. The stability index, determined after 10 days, indicated that the emulsions are stable, without showing the presence of one of the flocculation, creaming / sedimentation, coalescence or Ostwald ripening phenomena. The lowest value of the turbidity was obtained for the experimental variant containing the lowest amount of essential oil and propolis. For the same variant, the highest value of viscosity was obtained, in which 0,363 mL water /mL emulsion and 0,5 mL xanthan/mL emulsion volume fraction was used. The textile materials treated with the synthesized emulsions based on xanthan-propolis-cinnamon essential oil shows antibacterial effect against S. aureus and E. coli test strains

scholarly journals Functionalization of textile materials with bioactive polymeric systems based on propolis and cinnamon essential oil

2020 ◽  
Vol 71 (02) ◽  
pp. 186-192 ◽  
Author(s):  
LAURA CHIRILĂ ◽  
GABRIELA CRISTINA CONSTANTINESCU ◽  
ANGELA DANILA ◽  
ALINA POPESCU ◽  
ROXANA RODICA CONSTANTINESCU ◽  
...  
Keyword(s):  
Essential Oil ◽  
Ostwald Ripening ◽  
Volume Fraction ◽  
Activity Index ◽  
Stability Index ◽  
Point Of View ◽  
Polymeric Systems ◽  
Textile Materials ◽  
Stability Point ◽  
Cinnamon Essential Oil

In order to obtain the textile materials with potential for use in the treatment of inflammatory skin conditions, this study approached the laboratory experiments related to depositing by padding of oil-in-water emulsions type based on chitosan-propolis-cinnamon essential oil. In this regard, seven experimental variants of emulsions were prepared and then characterized by specific methods from physical-chemical and stability point of view. The chitosan-propolis- cinnamon essential oil-based emulsions were then immobilized on a knitted textile structure from 100% organic cotton. The functionalized textile materials were characterized from morphological and antibacterial activity point of view. pH values obtained for the synthesized polymeric systems were in the range 4.67–4.88 and electrical conductivity of the emulsions increases with the concentration of the hydrophilic phase in the system, the highest values were registered for the emulsion code R4CSP developed with the smallest volume fraction of water. The stability index over a period of 10 days indicated that emulsions are stable, not showing the presence of one of the flocculation, creaming / sedimentation, coalescence or Ostwald ripening phenomena. The highest values of emulsifying activity index were obtained for the R7CSP, emulsion developed with the smallest volume fraction of water. The highest value of viscosity was obtained for the experimental variant R4CSP in which the highest volume fraction of chitosan and the smallest volume fraction of water were used. The textile materials treated with synthesized emulsions based on chitosan- propolis-cinnamon essential oil have antibacterial effect against the S. aureus test strain, with inhibition zones between 1.5 mm (R2CSP and R7CSP) and 4 mm (R6CSP).

scholarly journals Mixing Oil-Based Microencapsulation of Garlic Essential Oil: Impact of Incorporating Three Commercial Vegetable Oils on the Stability of Emulsions

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1637
Author(s):  
Yunjiao Zhao ◽  
Rui Liu ◽  
Cuiping Qi ◽  
Wen Li ◽  
Mohamed Rifky ◽  
...  
Keyword(s):  
Essential Oil ◽  
Vegetable Oils ◽  
Encapsulation Efficiency ◽  
Ostwald Ripening ◽  
Corn Oil ◽  
Whey Protein Concentrate ◽  
Diallyl Disulfide ◽  
Active Components ◽  
The Stability ◽  
Garlic Essential Oil

The active components in garlic essential oil are easily degradable, which limits its application in the food industry. Vegetable oils (VOs) were used to improve the stability of garlic essential oil (GEO) emulsion. The volatile compounds of GEO and its mixtures with vegetable oils (VOs), including corn oil (CO), soybean oil (SO), and olive oil (OO) indicated that GEO-VO mixtures had a higher percentage of Diallyl disulfide and Diallyl trisulfide than pure GEO. Adding an appropriate amount of VOs promoted the GEO emulsion (whey protein concentrate and inulin as the wall materials) stability in order of CO > SO > OO. Evaluation of the encapsulation efficiency, controlled release, and antimicrobial activity of GEO-VO microcapsules showed that the GEO was successfully entrapped and slowly released with active antibacterial activities on both E. coli and S. aureus. Collectively, these results implied that VOs, especially for 20% CO, improved the stability of GEO emulsions and the encapsulation efficiency of GEO microcapsules. The mechanism might be related to (1) the regulating effect of density difference between oil and water phases on prevention to gravitational separation, (2) the promotion to the compatibility of GEO and VOs to inhibit the phase separation caused by Ostwald ripening.

scholarly journals Representation Stability of Power Sets and Square Free Polynomials

2015 ◽  
Vol 67 (5) ◽  
pp. 1024-1045
Author(s):  
Samia Ashraf ◽  
Haniya Azam ◽  
Barbu Berceanu
Keyword(s):  
Symmetric Group ◽  
Braid Group ◽  
Point Of View ◽  
Pure Braid Group ◽  
Representation Stability ◽  
Stability Point ◽  
Power Set ◽  
The Stability

AbstractThe symmetric group 𝓢n acts on the power set 𝓟(n) and also on the set of square free polynomials in n variables. These two related representations are analyzed from the stability point of view. An application is given for the action of the symmetric group on the cohomology of the pure braid group.

Exploring the effect of cinnamon essential oil to enhance the stability and safety of fresh apples

2020 ◽  
Vol 44 (12) ◽  
Author(s):  
Zonia Rashid ◽  
Moazam Rafiq Khan ◽  
Rafia Mubeen ◽  
Ali Hassan ◽  
Farhan Saeed ◽  
...  
Keyword(s):  
Essential Oil ◽  
Cinnamon Essential Oil ◽  
The Stability

scholarly journals Oil-In-Water Microemulsions for Thymol Solubilization

2019 ◽  
Vol 3 (4) ◽  
pp. 64 ◽  
Author(s):  
Laura Fernández-Peña ◽  
Sonia Gutiérrez-Muro ◽  
Eduardo Guzmán ◽  
Alejandro Lucia ◽  
Francisco Ortega ◽  
...  
Keyword(s):  
Essential Oil ◽  
Soybean Lecithin ◽  
Total Concentration ◽  
Point Of View ◽  
Transport Costs ◽  
Good Efficiency ◽  
Solubility In Water ◽  
Oil In Water ◽  
Stability Point ◽  
Alkyl Polyglucoside

Essential oil compounds (EOCs) are molecules with well-known antimicrobial and antipest activity. However, such molecules possess limited solubility in water, making their handling difficult. This work aimed to enhance the distribution of a solid essential oil compound, thymol, using oil-in-water (o/w) microemulsions for its solubilization. The use of mixtures formed by an alkyl polyglucoside (APG) and soybean lecithin (SL) allowed for stabilization of the o/w microemulsions in a broad range of compositions, with the total concentration of the mixture of the two surfactants (APG+SL) and the APG:SL ratio both being essential for controlling the nature of the obtained dispersions. The microemulsions obtained using oleic acid as the oil phase and with compositions far from those corresponding to the onset of the emulsion region showed a good efficiency for thymol solubilization. This is an advantage from a stability point of view, as well as for ease of thymol preparation. The present work opens new alternatives for designing eco-sustainable formulations for EOC solubilization, with the possibility of preparing the formulations at the place of use, thereby saving transport costs and reducing the emission of pollutants.

scholarly journals New Generation Stability Norms – How to Approach the Task

2018 ◽  
Vol 25 (s1) ◽  
pp. 56-62
Author(s):  
Lech Kobyliński
Keyword(s):  
Current Approach ◽  
Point Of View ◽  
Wave Crest ◽  
International Stability ◽  
Intact Stability ◽  
Stability Point ◽  
Weak Points ◽  
The Stability ◽  
New Generation ◽  
Dead Ship Condition

Abstract International stability norms included in the Code of Intact Stability 2008 adopted by IMO on 4 December 2008 constitutes the latest set of international requirements on intact stability of ships. However the requirements included in the Code, part of them compulsory (Included in the Part A of the Code), other only recommended (included in the Part B of the Code) are considered as not totally sufficient to assure safety of ships. Because of that, IMO decided that there would be the necessity to develop so called new generation stability criteria covering certain identified hazards, such as parametric resonance, loss of stability in the wave crest broaching, dead ship condition and excessive accelerations when rolling. Those criteria, or rather stability norms, are under development since 2008. The present approach, the work on which is well advanced, is however, not fully satisfactory and several important problems were discovered. This approach may need to be reconsidered or supplemented. The author in the paper presented discusses the weak points of the current approach and proposes possible different approach in order to make future ships safer from the stability point of view.

Nonlinear transient response of rough symmetric two lobe hole entry hybrid journal bearing system

2016 ◽  
Vol 23 (2) ◽  
pp. 190-219 ◽  
Author(s):  
Satish C Sharma ◽  
Prashant B Kushare
Keyword(s):  
Surface Roughness ◽  
Transient Response ◽  
Journal Bearing ◽  
Equations Of Motion ◽  
Point Of View ◽  
Stability Point ◽  
Nonlinear Transient ◽  
The Stability ◽  
Bearing System ◽  
Nonlinear Transient Response

The present paper describes the effect of surface roughness orientation pattern on the nonlinear transient response of symmetric two lobe capillary compensated hole entry hybrid journal bearing. Nonlinear equations of motion have been solved with the Runge-Kutta method. The stability of the journal bearing system has been studied by obtaining the journal center motion trajectories. The results of the study reveal that the surface roughness pattern significantly changes the stability of capillary compensated two lobe hole entry hybrid journal bearing. Hence, from the bearing stability point of view, a proper selection of the surface roughness pattern and bearing geometry is essential.

scholarly journals Agricultural unmanned ground vehicles: A review from the stability point of view

2020 ◽  
Vol 51 (5) ◽  
Author(s):  
Hugo Rafacho Fernandes ◽  
Edna Carolina Moriones Polania ◽  
Angel Pontin Garcia ◽  
Oscar Barrero ◽  
Daniel Albiero
Keyword(s):  
Point Of View ◽  
Unmanned Ground Vehicles ◽  
Ground Vehicles ◽  
Stability Point ◽  
The Stability

scholarly journals Accumulation capacity of soluble rocks as the main stability index in covered karst areas

2019 ◽  
pp. 3-14
Author(s):  
A. V. Anikeev
Keyword(s):  
Fractured Rock ◽  
Human Life ◽  
Stability Index ◽  
Soil Mass ◽  
Point Of View ◽  
Construction Site ◽  
Accumulation Capacity ◽  
Karst Areas ◽  
The Stability ◽  
Covered Karst

For an engineering geologist, covered karst areas are of special interest, not only because these are the most widespread on the Earth. More important, unlike the areas of bare karst, these areas are more favorable and suitable for economic development and human life as a whole. And the study shows that the greater is the thickness of the cover series, the more true is this statement. The local forecast of sinkholes appears to be the most important and difficult engineering geological problem in these areas. It is especially acute there, where collapses and subsidence are absent, not registered, or poorly expressed in the relief, that is, in the areas of unrealized (potential, expected) sinkhole hazard. One of the possible approaches to solving this problem is discussed in the paper. It is based on comparing the volume of incoherent and fractured rock removed from the cover deposits with the accumulation capacity of the karst massif, i.e., the volume of hollow space in the karstic massif capable of receiving and accumulating clastic material. The most common result of soils outflow in fissure-karst reservoirs is their loosening in the deformed-destructed area of the overburden. For the three canonical schemes of this area structure, the critical values of clastic matter volume were obtained from the equation for soil mass balance before and after loosening, the further removal of which will lead to the failure of the earth's surface. Some techniques and methods for assessing the accumulation capacity of soluble rocks are considered and serious differences in the use of the discussed approach in predicting the stability of karstified and undermined territories are revealed. In particular, it is shown that in karst areas, when performing calculations, one should be guided by the maximum values of the coefficient of primary loosening of soils. Otherwise, the predicted stability of the overburden will prove to be unjustifiably underestimated. The results obtained and the procedure for assessing the stability of covered karst terrains by the proposed method are exemplified by the construction site of the main buildings of the Nizhny Novgorod NPP (3.25 km2), where there are no collapse and subsidence sinkholes. However, the entire construction site (20 km2) is located in the area of active sulphate-carbonate karst. From the engineering-geological point of view, this is the main feature of the facility design.

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