Grapeskin
extraction is carried out using a dilute aqueous solution of an
acid, usually sulfurous acid. The extract is made up of various
anthocyanins, sugars, acids and salts. It is usually concentrated
to a viscous thick liquid of about ****0° Brix, containing about
0.5 to 1.5 % anthocyanin content. This liquid can be spray dried,
most often with maltodextrin as a carrier. The powder can average
4% anthocyanin. There are two forms of grapeskin extract available
commercially (liquid and powder). The extract is purchased not on
the anthocyanin content, but on color strength (absorbency / gm), a
measurement used to standardize batches. The differences observed
between batches/supplier are a function of variety, source,
condition of extraction, and the anthocyanin makeup of the extract.
These variables, as well as the properties of the product to be
colored, will dictate the functionality of grape skin and its
stability. sales1 at apex-bio.com
skype apexbio*1
