Abstract
In many cases in the clinical setting,trace elements are mixed with TPN products.However,in such therapy the rapid oxidative decomposition of vitamin C is a problem.In view of this,we investigated the stability of vitamin C in a newly developed kit product for TPN (ELNEOPA No.1 and No.2 Injections) which contains trace elements in addition to glucose,electrolytes,amino acids,and vitamins.
We evaluated the stability of vitamin C after mixing all the ingredients of ELNEOPA in comparison with the control solution (admixture of commercial TPN solution containing vitamins and a trace element preparation).Though vitamin C rapidly decomposed in the control solution,it was stable in ELNEOPA,with not less than 90% of the labeled amount remaining 7 days after mixing.The container (plastic bag) of ELNEOPA is made from a high gas barrier film and we consider the stability of vitamin C in it to be due to the film preventing an increase in oxygen in the solution.Also,as at least 90% of the labeled amount of vitamin B1 was still present 7 days after mixing,ELNEOPA is considered to be a very useful preparation for TPN therapy,including that in the home.
