Abstract: Methods of preparing highly purified steviol glycosides, particularly rebaudiosides M, D, E and I are described. The methods include utilizing enzyme preparations and recombinant microorganisms for converting various staring compositions to target steviol glycosides. The highly purified rebaudiosides are useful as non-caloric sweetener in edible and chewable compositions such as any beverages, confectioneries, bakery products, cookies, and chewing gums.

Abstract: An apparatus for impregnating liners with epoxy resin and the curing agents therefor includes an epoxy resin tank having a first discharge pipe with a first pump and a curing agent tank having a second discharge pipe with a second pump. Each discharge pipe leads through a flowmeter device. A control unit processes signals from the flowmeter devices with the amount of resin flow used being a control variable. The control unit, where the desired mixing ratio can be set as a parameter, sets or readjusts the pump for the curing agent tank to a precise amount of curing agent needed. A three-way valve is included in each of the epoxy resin and curing agent discharge pipes downstream from the pumps and the flowmeter devices. From each three-way valve, a conduit leads back into a corresponding tank and a further conduit leads to the mixing nozzle.