US 5,093,474 A · Process for the production of gelatin from fish skins

Abstract

A process for the production of gelatin from fish skins comprises the steps of: (a) cleaning the skins in order to remove therefrom substantially all superfluous material; (b) treating with dilute aqueous alkali; (c) washing with water until the washing water is substantially neutral; (d) treating with dilute aqueous mineral acid; (e) washing with water until the washing water is substantially neutral; (f) treating with dilute aqueous citric acid and/or another suitable organic acid; (g) washing with water until the washing water is substantially neutral; and (h) extracting with water at elevated temperatures not above about 55.degree. c., the washed citric acid-treated skins. In practice, the present process employs much lower temperatures than known heretofore for the treatment steps, which results in a high quality product (e.g. absence of a fishy smell), compared with the prior art.

Claims26

Dependent claims

A process for the production of gelatin from fish skins, said gelatin possessing such gelling capacity, appearance, odor, clarity and boom as to render it suitable for human consumption in food products, which comprises the steps of:

(a) cleaning the skins in order to remove therefrom substantially all superfluous material;
(b) treating the cleaned skins with dilute aqueous alkali;
(c) washing the alkali-treated skins with water until the washing water is substantially neutral;
(d) treating the thus-neutralized skins with dilute aqueous mineral acid selected from hydrochloric and sulfuric acids;
(e) washing the mineral acid-treated skins with water until the washing water is substantially neutral;
(f) treating the thus-neutralized skins with dilute aqueous citric acid;
(g) washing the citric acid-treated skins with water until the washing water is substantially neutral;
and
(h) extracting with water at elevated temperatures not above about 55.degree. C., the washed citric acid-treated skins.

6 more elements

A process for the production of gelatin from fish skins, said gelatin possessing such gelling capacity, appearance, odor, clarity and bloom as to render it suitable for human consumption in food products, which comprises the steps of:

(a) cleaning the skins in order to remove therefrom substantially all superfluous material and macerating or cutting into pieces the cleaned skins;
(b) treating the skins from step (a) with dilute aqueous alkali of concentration within the range of about 0.05 to about 0.3% wt./vol.;
(c) washing the alkali-treated skins with water until the washing water is substantially neutral;
(d) treating the thus-neutralized skins with dilute aqueous mineral acid selected from hydrochloric and sulfuric acids of concentration within the range of about 0.05 to about 0.3% wt./vol.;
(e) washing the mineral acid-treated skins with water until the washing water is substantially neutral;
(f) treating the thus-neutralized skins with dilute aqueous citric acid having a concentration within the range of about 0.5 to about 6.0% wt./vol.;
(g) washing the citric acid-treated skins with water until the washing water is substantially neutral;
and
(h) extracting with water at elevated temperatures not above about 55.degree. C., the washed citric acid-treated skins;
provided that said steps (a) to (g) are each effected at a temperature within the range of about 15 to about 27.degree. C., and step (h) is effected at a temperature within the range of about 40.degree. to about 50.degree. C.

7 more elements

(a) cleaning the skins in order to remove therefrom substantially all superfluous material;
(b) treating the skins from step (a) with dilute aqueous alkali of concentration within the range of about 0.05 to about 0.3% wt./vol.;
(c) washing the alkali-treated skins with water until the washing water is substantially neutral;
(d) treating the thus-neutralized skins with dilute aqueous mineral acid selected from hydrochloric and sulfuric acids of concentration within the range of about 0.05 to about 0.3% wt./vol.;
(e) washing the mineral acid-treated skins with water until the washing water is substantially neutral;
(f) treating the thus-neutralized skins with dilute aqueous organic acid comprising at least one member selected from the group consisting of ascorbic, citric fumaric, malic, succinic and tartaric acids, and other organic acids which are acceptable in food processing and which do not possess or impart an offensive odor;
(g) washing the organic acid-treated skins with water until the washing water is substantially neutral;
and
(h) extracting with water at elevated temperatures not above about 55.degree. C., the washed organic acid-treated skins;
provided that said steps (a) to (g) are each effected at a temperature within the range of about 15.degree. to about 27.degree. C., and step (h) is effected at a temperature within the range of about 40.degree. to about 50.degree. C.

7 more elements

Dependencies are inferred from the claim text.

Process for the production of gelatin from fish skins

Life of this patent

Process for the production of gelatin from fish skins

Life of this patent

Abstract

Claims26