High purity carnosic acid from rosemary and sage extracts by pH-controlled precipitation
US5859293A · kind A · utility
12Cited by
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33Claims
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Key dates
| Filing date | Jul 14, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Jul 14, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A40/90
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
A process for the extraction and isolation of concentrated carnosic acid from plant matter of the Labiatae family including contacting the plant matter with a water-miscible solvent to form a plant extract and adjusting the pH of the plant extract to a level between 7 and 10 while adding water in an amount sufficient to cause precipitation of impurities while retaining the carnosic acid salt in solution. The impurities are separated and the remaining aqueous solution is acidified to precipitate a highly purified carnosic acid product which is essentially odorless, flavorless and colorless.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.