Extraction of ginger rhizome: kinetic studies with acetone

Publisher Website
Google Scholar
Abstract
Summary: Ground sieved Jamaican ginger rhizome has been treated with acetone under various conditions and, in each case, the concentration of [6]‐gingerol extracted was measured as a function of time. The results could be expressed by two intersecting first‐order plots and an initial intercept, representing very rapid initial extraction, followed by a fast stage and a subsequent slow stage. At 30°C the rate constant of the slow stage was c. 95 times smaller than that of the fast stage and its activation energy was 3.6 times larger. The fast stage was not affected by solvent flow into the ginger particles, or by an increase in the stirring speed. These findings, together with the fact that both first‐order rate constants were inversely proportional to the square of the radius of the particles, pointed to [6]‐gingerol diffusion through the solid ginger as the rate‐determining step. The data could also be fitted by the equation of So and MacDonald (1986). The relevance of the research to the industrial production of ginger oleoresin is pointed out.

This publication has 12 references indexed in Scilit: