Anthocyanin complex synthesized from date palm leaf extract

Patent metadata

Field	Value
Publication number	US-11332439-B2
Application number	US-202017070379-A
Country	US
Kind code	B2
Filing date	Oct 14, 2020
Priority date	Oct 14, 2020
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

The anthocyanin synthesized from date palm may include co-pigmented anthocyanin complexes synthesized by extracting an anthocyanin from date palm leaves and reacting the anthocyanin with phenolic compounds also resulting from date palm leaf extraction in order to produce a co-pigmented anthocyanin complex. Date palm leaf powder may be mixed with water containing about 1.08% hydrochloric acid in a glass or ceramic lined reactor, and extraction may be performed by boiling the mixture for an hour or more. The color of the co-pigmented anthocyanin complex produced by this method may be adjusted by continuing the heating in half hour increments, in order to deepen the hue of the co-pigmented anthocyanin complex. The co-pigmented anthocyanin complex may be separated from the liquid mixture by first filtering the liquid mixture, refining the liquid mixture by adding gelatin to form a colloidal solution, and freeze-drying the refined liquid mixture.

First claim

I claim:

1. A method of synthesizing a co-pigmented anthocyanin complex comprising the steps of:
grinding leaves of date palms ( Phoenix dactylifera ) to obtain about 500 g of powdered date palm leaves;
boiling the powdered date palm leaves in an acidic aqueous extraction solvent to obtain a red extraction mixture, wherein the acidic aqueous extraction solvent consists of about 1.08% hydrochloric acid (wt./vol.) in water,
filtering the red extraction mixture to obtain a filtrate;
adding gelatin to the filtrate to obtain a colloidal solution; and
freeze-drying the colloidal solution at −80° C. and 0.3 mbar pressure to obtain the co-pigmented anthocyanin as a dry powder, wherein the co-pigmented anthocyanin has the following structural formula:

2. The method of claim 1 , wherein adding gelatin to the filtrate comprises adding about 20 g of gelatin to about 3 liters of filtrate.

Assignees

• Univ United Arab Emirates

Inventors

• Abdalla Hassan Mohamed Hassan

Classifications

• C09B61/00

  Dyes of natural origin prepared from natural sources {, e.g. vegetable sources} · CPC title

• C07H17/07

  Benzo[b]pyran-4-ones · CPC title

• A23L5/44 Primary

  using carotenoids or xanthophylls · CPC title

• A23L5/43

  using naturally occurring organic dyes or pigments, their artificial duplicates or their derivatives · CPC title

• C07H1/00

  Processes for the preparation of sugar derivatives · CPC title