Two-step bleaching of plant materials
US5219601A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1992 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Mar 12, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA23L5/49
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
A variety of plant materials adopted for processing into, e.g., low-calorie vegetable fibers and dietary flours, are bleached by (1) prebleaching such plant material in a first aqueous solution containing an alkaline agent and hydrogen peroxide, the alkaline agent being present in solution in such amount that the final pH of the resulting suspension is no greater than 9, (2) filtering and washing the suspension produced in step (1) with water, to an effectiveness of at least 50%, (3) bleaching the material obtained after step (2) in a second aqueous solution containing an alkaline agent and hydrogen peroxide, the alkaline agent being present in solution in such amount that the final pH of the resulting suspension is no greater than 8.5, and, characteristically, (4) filtering and washing the suspension produced in step (3) with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.