Abstract - Preparation and Properties of Low Protein NR Latex using Stabilised Liquid Papain


	Journals and Publications


	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Preparation and Properties of Low Protein NR Latex using Stabilised Liquid Papain K. Mariamma George, G. Rajammal, Geethakumary Amma and N.M. Mathew An attempt was made to produce low protein natural rubber (NR) latex suitable for making surgical gloves with low levels of extractable protein content in a single centrifuging process. Stabilised liquid papain from papaya plant (Carica papaya) at two dosages viz., 0.25 p.h.r. and 0.5 p.h.r. was used for latex deproteinization. A process was standardised for the deproteinization of NR latex by conducting laboratory, pilot plant and plant trials. Processing and technological properties of these low protein latices were assessed. Surgical gloves were prepared in an automatic dipping plant under different conditions of leaching. The extractable protein content and physical properties of the gloves were determined. The results showed that low protein latex prepared using 0.25 p.h.r. of liquid papain produced gloves of extractable protein (EP) content less than 50 µg/dm². Antigenic protein content obtained for the samples were also less than 10 µg/dm². Continuous production of surgical gloves from this latex by on line wet gel and post-cure leaching was found to give low protein gloves with good physical properties. The effect of slurry dip on protein content could be controlled more effectively using this latex as the amount of EP content in the original latex was low and hence the amount of proteins leaching into the slurry would also be less. Storage behaviour of this latex and its vulcanizates was studied in comparison to normal centrifuged latex (cenex). Changes in raw latex properties such as volatile fatty acids, mechanical stability time, potassium hydroxide number and zinc oxide viscosity were comparable for both the latices. But the change in EP content for low protein latex vulcanizates was from 68 to 88 µg/dm² where as for the cenex, the increase was from 150 to 368 µg/dm². Physical properties of latex film vulcanizates were more or less unaffected by storage. back
The Government and Malaysian Rubber Board shall not be liable for any loss or damage caused by the usage of any information obtained from this site. Malaysian Rubber Board 2002. All Rights Reserved. Best viewed with Internet Explorer 6.x browser.