Method for recovery of stevioside
US4599403A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Oct 7, 1985 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Oct 7, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07H15/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.