Earlier studies using methylparaben and propylparaben showed extensive losses due to
sorption by silicone, polyvinyl chloride, and other flexible tubing. As much as 100% loss of …

Flexible tubings are extensively used in pharmaceuticals, food industry, and in hospitals.
This study was undertaken to compare various flexible tubings to determine their sorption …

Earlier studies using methylparaben, propylparaben, and several types of flexible tubing
showed that the parabens are sorbed by a number of commonly used tubing. The sorption …

The adsorption of esters of p-hydroxybenzoic acid (parabens) by filter membranes was
studied by a flow-through technique. The hydrophobic effect was the major mechanism of …

The evaluation of preservative stability in a formulation throughout its life cycle (production,
shipping, and storage) is an important part of product development and essential to ensuring …

The mechanism of loss of propylparaben potency from formulations when in contact with
polyvinyl chloride has been determined. It is caused by the adsorption of propylparaben …

The solubility of methyl and propyl p-hydroxybenzoate esters (parabens) in 3 M
concentrations of the co-solvents ethanol, propylene glycol and glycerol was investigated …

Two new HPLC-UV methods are described for determining methyl paraben and propyl
paraben, methyl paraben sodium and propyl paraben sodium in oral and injection …

The release phenomena of propyl paraben from a polymer coating to water and three food
simulating solvents (10% aqueous ethanol, 50% aqueous ethanol, n‐heptane) were studied …

The present work studies the interaction of methyl paraben (MPB) and propyl paraben
(PPB), two widely used antimicrobial agents in multi-dose ophthalmic formulations, with 5 …