Method for producing an extraction substance from leaves of the Chinese blackberry

摘要

Producing a plant extract of leaves of sweet blackberry ( Rubus chingii var. suavissimus) comprises: (a) performing an aqueous primary extraction of the dried sweet blackberry leaves; (b) alcoholically precipitating the obtained aqueous extract; (c) separating and discarding the obtained precipitate; (d) further precipitating the remaining extract of the steps (b) and (c) with calcium hydroxide; (e) separating and discarding the precipitate obtained in the step (d); and (f) further processing the remaining extract of the steps (d) and (e) as a liquid-, a paste or a dry extract. An independent claim is also included for the extract of the leaves of sweet blackberry ( Rubus chingii var. suavissimus) comprising (in % based on dry material): water (4.64), protein (NX6.25) (2.79), fat (1.6), carbohydrate (73.61), sugar (19.1), glucose (9.85), fructose (9.25), sucrose (less than o.1), roughage (5.55), ash (11.81), sodium (647.2 mg/kg), an amino acid (4.3 mg/g), L-proline (2.1 mg/g), L-glutamic acid (0.04 mg/g) and rubusoside (18).