Temperature dependent physicochemical studies of polyethylene glycols (PEG-400 and PEG-4000) in aqueous sorbitol solutions

2018 ◽  
Vol 268 ◽  
pp. 700-706 ◽  
Author(s):  
Kirandeep Kaur ◽  
K.C. Juglan ◽  
Harsh Kumar
Keyword(s):  
Polyethylene Glycols ◽  
Temperature Dependent ◽  
Peg 400 ◽  
Peg 4000 ◽  
Physicochemical Studies

scholarly journals Effects of polyethylene glycols on intestinal efflux pump expression and activity in Caco-2 cells

2015 ◽  
Vol 51 (3) ◽  
pp. 745-753 ◽  
Author(s):  
Darya Hodaei ◽  
Behzad Baradaran ◽  
Hadi Valizadeh ◽  
Parvin Zakeri-Milani
Keyword(s):  
Efflux Pump ◽  
Polyethylene Glycols ◽  
Glycoprotein P ◽  
Peg 6000 ◽  
Peg 400 ◽  
P Glycoprotein ◽  
Peg 4000 ◽  
Substrate Drug ◽  
Toxic Concentrations ◽  
Intestinal Efflux

The present study was planned to investigate the influence of polyethylene glycols (PEGs) on the activity and expression of P-glycoprotein (P-gp). Sub-toxic concentrations of PEGs in Caco-2 cells were determined using the MTT test assay. Then the measurement of Rhodamine-123 (Rho-123) uptake, a P-gp fluorescence substrate, in Caco-2 cells confronting PEG 400 (1% and 2% w/v), PEG 4000 (2% and 4% w/v), PEG 6000 (2% and 4% w/v), PEG 10000 (2% and 4% w/v), PEG 15000 (1% and 2% w/v), and PEG 35000 (2% and 4% w/v) overnight was taken to elucidate whether non-toxic concentrations of PEGs are able to impact P-gp activity. Furthermore, western blotting was carried out to investigate P-gp protein expression. The results showed that PEG 400 at concentrations of 1% (w/v) and 2% (w/v) and PEG 6000 at the concentration of 4% (w/v) are notably capable of blocking P-gp. Based on the obtained results it is concluded that the mentioned excipients could be used to obstruct P-gp efflux transporter in order to increase the bioavailability of co-administered substrate drug.

Cryoprotection of Plagiomnium affine induced by various natural and artificial substances

1993 ◽  
Vol 71 (6) ◽  
pp. 793-798 ◽  
Author(s):  
Dorothea Rütten ◽  
Kurt A. Santarius
Keyword(s):  
Plasma Membrane ◽  
Compatible Solutes ◽  
Frost Tolerance ◽  
Polyethylene Glycols ◽  
Freeze Thaw ◽  
Molecular Weights ◽  
Peg 400 ◽  
Peg 4000 ◽  
Sufficient Concentration ◽  
Uptake And Release

Greenhouse-grown shoots of Plagiomnium affine (Funck) Kop. were incubated in solutions of various potential cryoprotectants prior to freeze–thaw treatment. Sucrose uptake and release and plasmolysis studies indicated that the permeability of the plasma membrane of leaf cells for sugars, proline, and polyethylene glycols with average molecular weights of 400 (PEG-400) and 1000 (PEG-1000) was very low or insignificant, but that dimethylsulfoxide readily penetrated into the cytosol. Pretreatment of shoots at concentrations of these compounds that induced plasmolysis effectively increased the cryoprotection of the moss tissue. Obviously, damage of the plasma membrane by freeze–thaw treatment was avoided when compatible solutes reached a sufficient concentration either in the cytosol, outside the protoplast, or in both compartments. Pretreatment of shoots with hypertonic glycerol and PEG-4000 solutions also caused plasmolysis but did not prevent freeze–thaw damage. Efficient cryoprotection of moss thalli by various additives indicates that cryoprotective compounds could also play a role in acquisition of frost tolerance of bryophytes. Key words: cryoprotection, freezing, frost tolerance, permeation, photosynthesis, Plagiomnium affine, sucrose.

Extraction of polyethylene glycols with dicarbolide solutions in nitrobenzene

1990 ◽  
Vol 55 (8) ◽  
pp. 1959-1967 ◽  
Author(s):  
Petr Vaňura ◽  
Pavel Selucký
Keyword(s):  
Polyethylene Glycol ◽  
Molecular Mass ◽  
Extraction Constant ◽  
Metal Extraction ◽  
Polyethylene Glycols ◽  
Relative Molecular Mass ◽  
Published Data ◽  
Average Molecular Mass ◽  
Peg 400 ◽  
Extraction Constants

The extraction of polyethylene glycol of average molecular mass 400 (PEG 400) with dicarbolide solution in nitrobenzene and of longer-chain polyethylene glycol, of average molecular mass 1 500 (PEG 1 500), with chlorinated dicarbolide solution in nitrobenzene was studied. During the extraction of PEG 400, the polyethylene glycol solvates the Horg+ ion in the organic phase giving rise to the HLorg+ species (L is polyethylene glycol). The obtained value of the extraction constant Kex(HLorg+) = 933 is consistent with published data of metal extraction. Extraction of PEG 1 500 was treated applying the simplified assumption that the thermodynamic behaviour of PEG 1 500 is the same as that of n molecules of polyethylene glycol with relative molecular mass 1 500/n, each solvating one cation. For this model, the value of n = 3.2 ± 1.1 and the values of the extraction constants of the HL1/n,org+ and HL2/n,org+ species were obtained by using the adapted program LETAGROP. This value of n is consistent with published extraction data in the presence of polyethylene glycol with a relative molecular mass from 200 to 1 000.

FORMULASI SEDIAAN SALEP EKSTRAK ETANOL DAUN ALPUKAT (Persea americana Mill.) SEBAGAI ANTIACNE

2017 ◽  
Vol 2 (2) ◽  
pp. 224
Author(s):  
Yulistia Budianti Soemarie ◽  
Tri Astuti ◽  
Nur Rochmah
Keyword(s):  
Side Effect ◽  
Propionibacterium Acnes ◽  
Ethanol Extract ◽  
Persea Americana ◽  
Natural Materials ◽  
Peg 400 ◽  
Synthetic Chemicals ◽  
Peg 4000 ◽  
Staphylococcus Epidermis ◽  
Acne Treatment

Currently, the development of acne drugs (antiacne) use  many natural materials because the natural materials can minimize the side effect if compared with synthetic chemicals drugs. Acne can caused by propionibacterium acnes, staphylococcus epidermis and staphylococcus aureu. One of plants that can be used for acne treatment is leaves of Avocado (Persea americana Mill). The aim of this study was to know whether the ethanol extract of leaves of avocado (Persea americana Mill.) can be made into an ointment preparations that fulfill the requirements. Sample in this research was extract of avocado leaves which used maceration method. The ointment formulations were made into some variation concentrations of PEG 400 and PEG 4000: Formula I (30%:70%); Formula II (50%:50%) and Formula III (70%:30%). The results show that the ointment of avocado leaves which fulfilled the requirements of physical properties is formula III with concentration of PEG 400 70 % and PEG 4000 30 %

scholarly journals PENGARUH VARIASI KONSENTRASI EKSTRAK DAUN BELIMBING WULUH (Averrhoa bilimbi L) TERHADAP KARAKTERISTIK SEDIAAN SALEP DENGAN MENGGUNAKAN BASIS PEG 4000 dan PEG 400

2021 ◽  
Vol 2 (02) ◽  
pp. 7
Author(s):  
Tri Puji Lestari
Keyword(s):  
Leaf Extract ◽  
Homogeneity Test ◽  
Test Results ◽  
Peg 400 ◽  
Cell Tissue ◽  
Peg 4000 ◽  
Significant Difference ◽  
Ointment Formulation ◽  
The Difference ◽  
One Way Anova

ABSTRAK Daun Belimbing Wuluh (Averrhoa bilimbi L) memiliki kandungan tanin dan flavonoid. Kandungan Flavonoid dan Tanin yang terdapat dalam belimbing wuluh mampu memberikan efek untuk menyembuhkan kulit yang mengalami kerusakan jaringan sel akibat luka bakar. Ada beberapa cara untuk pemanfaatan Daun Belimbing Wuluh antara lain dengan dibuat dalam sediaan salep. Pada penelitian ini salep dibuat dengan variasi konsentrasi ekstrak daun belimbing wuluh sebesar 10%, 15%, dan 20%  mengguankan basis PEG 4000 dan PEG 400. Ekstrak daun belimbing wuluh diperoleh menggunakan metode maserasi dengan menggunakan etanol 70% sebagai pelarutnya. Salep yang sudah dibuat kemudian dilakukan uji karakteristik meliputi uji organoleptis, homogenitas, daya lekat dan uji daya sebar. Hasil uji organoleptis dan homogenitas di analisa secara deskrisptif kemudian hasil uji daya lekat dan uji daya sebar di analisa dengan menggunakan analisa statistik one-way ANOVA.  Hasil penelitian menunjukan bahwa salep berbentuk semipadat dengan warna hijau muda sampai hijau kehitaman. Hasil uji homogenitas di dapatkan untuk ketiga formula adalah homogen. Nilai daya sebar pada ketiga formula menunjukan perbedaan yang signifikan, pada hasil uji daya lekat dan pH didapatkan tidak ada perbedaan yang signifikan terhadap ketiga formulasi. Dengan demikian perbedaan konsentrasi zat aktif yang digunakan berpengaruh terhadap daya sebar sediaan salep ekstrak daun belimbing wuluh. Kata kunci: Averrhoa bilimbi L; Salep; PEG   ABSTRACT Carambola leaf Wuluh (Averrhoa bilimbi L) contains tannins and flavonoids. The content of flavonoids and tannins contained in starfruit able to give effect to heal skin damaged cell tissue from burns. There were several ways for  utilization  of  Averrhoa  bilimbi  L.  among  others,  made  some  preparations, especially ointment formulation. This study aims to formulate leaf extract ointment preparation starfruit (Averrhoa bilimbi L) with various concentrations of 10%, 15%, and 20% using the PEG 4000 and PEG 400 as a base. Leaf extract obtained from meserasi leaf Averrhoa bilimbi  L  with  70%  ethanol. The ointment that has been made is then subjected to characteristic tests including organoleptic tests, homogeneity, adhesion and spreadability tests. The results of the organoleptic test and homogeneity were analyzed descriptively, then the results of the adhesion test and the spreadability test were analyzed using one-way ANOVA statistical analysis. The results showed that the ointment was semisolid, light green to blackish green. The homogeneity test results obtained for the three formulas are homogeneous. The value of the spreadability of the three formulas showed a significant difference, the results of the adhesion and pH test showed no significant difference between the three formulations. Thus the difference in the concentration of the active substance used affects the spreadability of the starfruit leaf extract ointment. Keywords: Averrhoa bilimbi L; ointment; PEG

Effect of Ground Vulcanizate Modification Methods on Properties of Oil-Petroleum-Resistant Rubber

2021 ◽  
Vol 903 ◽  
pp. 127-133
Author(s):  
Vadim Myadelets ◽  
Vjaceslavs Lapkovskis ◽  
Andrey V. Kasperovich
Keyword(s):  
Chemical Nature ◽  
Nitrile Rubber ◽  
Rubber Crumb ◽  
Elongation At Break ◽  
Compression Set ◽  
Peg 400 ◽  
Peg 4000 ◽  
Modification Method ◽  
Resistant Rubber ◽  
Set Up

In this paper, the influence of the modification method applied to ground vulcanizate (GV) on the properties of elastomeric compositions based on nitrile rubber is discussed. Modified GV has been mixed with the elastomeric composition, which is used for the manufacturing of oil-petroleum-resistant rubber products.The work takes into consideration two types of GV with different chemical nature. The first GV type is rubber crumb produced from end-of-life tires. The second GV type was obtained from rubber wastes based on nitrile rubber. Three methods of the modification are compared in the research: mechanical activation in a planetary ball mill, swelling in a Polyethylene glycol (PEG-400) medium, and the mechano-chemical transformation of GV with PEG-4000. It is shown that depending on the dosage addition of GV modified with PEG-4000 reduce the compression set up for (16.1±0.7%), the strength decreases only by 2.1–8.3%, and the elongation at break increases by 0.8–10.3% compared to rubber without additives.

scholarly journals Preparation and evaluation of azithromycin binary solid dispersions using various polyethylene glycols for the improvement of the drug solubility and dissolution rate

2016 ◽  
Vol 52 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Ehsan Adeli
Keyword(s):  
Dissolution Rate ◽  
Solid Dispersion ◽  
Solid Dispersions ◽  
Water Soluble ◽  
Polyethylene Glycols ◽  
X Ray Diffraction ◽  
Drug Release Profile ◽  
Scanning Calorimetry ◽  
Peg 4000 ◽  
Poorly Soluble

ABSTRACT Azithromycin is a water-insoluble drug, with a very low bioavailability. In order to increase the solubility and dissolution rate, and consequently increase the bioavailability of poorly-soluble drugs (such as azithromycin), various techniques can be applied. One of such techniques is "solid dispersion". This technique is frequently used to improve the dissolution rate of poorly water-soluble compounds. Owing to its low solubility and dissolution rate, azithromycin does not have a suitable bioavailability. Therefore, the main purpose of this investigation was to increase the solubility and dissolution rate of azithromycin by preparing its solid dispersion, using different Polyethylene glycols (PEG). Preparations of solid dispersions and physical mixtures of azithromycin were made using PEG 4000, 6000, 8000, 12000 and 20000 in various ratios, based on the solvent evaporation method. From the studied drug release profile, it was discovered that the dissolution rate of the physical mixture, as the well as the solid dispersions, were higher than those of the drug alone. There was no chemical incompatibility between the drug and polymer from the observed Infrared (IR) spectra. Drug-polymer interactions were also investigated using Differential Scanning Calorimetry (DSC), Powder X-Ray Diffraction (PXRD) and Scanning Election Microscopy (SEM). In conclusion, the dissolution rate and solubility of azithromycin were found to improve significantly, using hydrophilic carriers, especially PEG 6000.

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