HPLC method was developed for the analysis of Levo Dopa in formulations. In this method we focused on easy and more accuracy. A mixture of Acetonitrile: Methanol: orthophosphoric acid in the ratio of 30:50:20, v/v/v was prepared and used as mobile phase. The mobile phase is 6.8. The wave length of U.V detector 280 nm. We obtained a good resolution peak 2.4 min. The linearity of method is 10-25 ...

This work aimed at determining 4-vinylguaiacol and 4-vinylphenol in the top-fermented wheat beers using different wavelength and the mobile phase for HPLC. Best results for isocratic elution were obtained at 260 nm and the mobile phase comprising methanol/ultrapure water/phosphoric acid (400/590/10, V/V). Under these conditions, the retention time of 4-vinylguaiacol and 4-vinylphenol was 25 and...

The interaction between non-ionic surfactants and cholesterol has been studied by reversed-phase thin-layer chromatography (RP-TLC) using cholesterol impregnated TLC plates and methanol–water mixtures as mobile phases. The RM values obtained were in linear correlation with the methanol concentration of the mobile phase. The intercept obtained from linear regression analysis (RM0), being charact...

Zero Crossing Digital Phase Locked Loop with Arc Sine block (AS-ZCDPLL) is used to linearize the phase difference detection, and enhance the loop performance. The loop has faster acquisition, less steady state phase error, and wider locking range compared to the conventional ZCDPLL. This work presents a Zero Crossing Digital Phase Locked Loop with Arc Sine block (ZCDPLL-AS). The performance of ...

We studied the use of dimethyl carbonate (DMC) as a non-toxic, aprotic modifier for hydrophilic liquid interaction chromatography (HILIC) and normal-phase (LC). A comparison ethyl acetate (EA) DMC organic mobile-phase modifiers in hexane LC phthalates was conducted with silica column showed that retention factors (k) at same percentage were about factor two greater DMC. Detection 215 nm, possib...

mobile robot navigation is one of the basic problems in robotics. in this paper, a new approachis proposed for autonomous mobile robot navigation in an unknown environment. the proposedapproach is based on learning virtual parallel paths that propel the mobile robot toward the trackusing a multi-layer, feed-forward neural network. for training, a human operator navigates themobile robot in some...

Mobile phase optimization is highly important in planar chromatography. Solvent selection based on experience and chromatographic intuition can be very time consuming when applied to complex mixtures. In these cases, more systematic strategies are needed. This paper presents a new mathematical model for the optimization of the mobile phase composition used for the separation of a mixture of 1,4...