Effect of magnesium and phosphate ions on the stability of concentrated natural rubber latex and the properties of natural rubber latex–dipped products

2006 ◽  
Vol 99 (6) ◽  
pp. 3120-3124 ◽  
Author(s):  
L. Karunanayake ◽  
G. M. Priyanthi Perera
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Phosphate Ions ◽  
The Stability

Characterization of Lidocaine Transdermal Patches from Natural Rubber Latex

2013 ◽  
Vol 747 ◽  
pp. 103-106 ◽  
Author(s):  
Prapaporn Boonme ◽  
Hasleena Boontawee ◽  
Wirach Taweepreda ◽  
Wiwat Pichayakorn
Keyword(s):  
Drug Release ◽  
Natural Rubber ◽  
Physicochemical Properties ◽  
Rubber Tree ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Transdermal Patches ◽  
The Stability ◽  
Main Component

The mucous liquid of Hevea brasiliensis or Para rubber tree, called natural rubber latex (NRL), composes of cis-1,4-polyisoprene which can form a patch under suitable formulation. In this study, blank and 5% lidocaine-loaded NRL patches were formulated and then characterized for physicochemical properties as well as evaluated in vitro drug release and stability. The patches were observed for their appearances. Surface morphology of the patches was investigated using a SEM. XRD was employed to study the crystallinity of the drug, the patch, and the drug-loaded patch. The extractions of lidocaine-loaded patches were analyzed for drug contents by HPLC. In vitro drug release study was performed using modified Franz diffusion cells. The patches at initial preparation and after kept at 4, 25, and 45 °C for 3 months were investigated for the stability determination. The results suggested that NRL could be used as a main component in pharmaceutical transdermal patches with acceptable physicochemical properties. Lidocaine-loaded NRL patches provided desirable drug release but high storage temperatures could age the patches resulting in darken color and lower release amount.

scholarly journals INFLUENCE OF THE VOLATILE FATTY ACID CONTENT TO RADIATION VULCANIZED NATURAL RUBBER LATEX (RVNRL)

2012 ◽  
Vol 09 (17) ◽  
pp. 38-41
Author(s):  
Hugo David CHIRINOS ◽  
Sueli CARVALHO DE JESUS
Keyword(s):  
Fatty Acid ◽  
Natural Rubber ◽  
Acid Content ◽  
Volatile Fatty Acid ◽  
Fatty Acid Content ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Protein Layer ◽  
Physical Strength ◽  
The Stability

Natural rubber latex is a dispersion of natural rubber particles in water. These particles are coated with a protein layer which will stabilize the dispersion in water by forming an electric charge in the layer. Any different condition affecting this layer disturbs the stability of dispersion. Microorganism attack disturbs the protein layer and consequently the stability of the dispersion. By adding 1.2% by weight of NH3, the stability of the dispersion can be improved. The fresh latex was irradiated by Co-60 with irradiation dose of 10, 20, 30, 40 and 100 kGy. The results showed a relationship between the volatile fatty acid content (VFA, product from microorganism attack on carbohydrate) and the green strength or the physical properties of vulcanized film. Low VFA number showing a higher physical strength of the film either un-vulcanized or vulcanized. It appeared that the structure was responsible in yielding a good physical property of the film.

Effect of the vulcanization time and storage on the stability and physical properties of sulfur-prevulcanized natural rubber latex

2005 ◽  
Vol 97 (5) ◽  
pp. 1804-1811 ◽  
Author(s):  
K. K. Sasidharan ◽  
Rani Joseph ◽  
Shiny Palaty ◽  
K. S. Gopalakrishnan ◽  
G. Rajammal ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Physical Properties ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
The Stability ◽  
And Storage

Effect of Lipids on the Stability of Natural Rubber Latex and Tensile Properties of its Films

2017 ◽  
Vol 20 (4) ◽  
pp. 213-222 ◽  
Author(s):  
H. Yu ◽  
Q. Wang ◽  
J. Li ◽  
Y. Liu ◽  
D. He ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Tensile Properties ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
The Stability
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