Method for recovery of stevioside

Details Method for recovery of stevioside Method for recovery of stevioside

1985-10-07

1986-07-08

Brown, Johnnie R.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536 185, 536128, C07H 108

Patent

active

045994030

ABSTRACT:
An improved method for the recovery of stevioside from Stevia rebaudiana Bertoni plants is provided which does not require the use of dangerous chemicals or special separation equipment such as ion exchange or chromatography. In the process the raw material, preferably in comminuted form is first extracted with water, the resulting aqueous extract is treated with a di- or tricarboxylic acid chelating agent to remove metallic and other impurities as well as to lower the pH to less than about 4. Subsequently a calcium-containing agent is added to precipitate out other impurities. The aqueous extract is essentially neutralized with an acid and is then subject to extraction with a water-immiscible solvent. Purified stevioside crystals are recovered by cooling the water layer obtained from said solvent extraction step.

REFERENCES:
patent: 4171430 (1979-10-01), Matsushita et al.
patent: 4454290 (1984-06-01), DuBois

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