Palm oil is one of the major oils and fats produced in world today. The quality palm crucial to be investigated, indices free fatty acid (FFA) content. Therefore, this study, an electrochemical approach for determination FFA has been explored as alternative replace conventional method (titration method). was developed based on electrochemically reduced graphene oxide (rGO) coupled with gold nan...

An amperometric biosensor for the detection of polyphenols in wine has been developed immobilizing the two enzymes Tyrosinase and Laccase on graphite screen printed electrodes modified with ferrocene. Different immobilization procedures have been carried out, the sensor operational parameters have been optimized, determining the best conditions and the analytical method for the analysis of samp...

We attempted to develop a screen-printed biosensor for the amperometric determination of L-lactate dehydrogenase (LDH) level on the basis of NAD(+)/NADH-dependent dehydrogenase reaction. The printing ink for the working electrode consisted of L-lactate, NAD(+), composite polymer of hydroxyethyl cellulose with ethylene glycol, 3,4-dihydroxybenzaldehyde (3,4-DHB) as an electron transferring media...