Extrusion process

Abstract

The present invention relates to a process for the production of extruded formulations (=extrudates) comprising dispersion droplets, to such formulations as well as to the use of such formulations in food, feed, personal care applications.

Claims

1. A process for production of an extrudate which comprises dispersion droplets, wherein the process comprises: (i) introducing emulsion ingredients consisting of at least one carotenoid, modified food starch as an emulsifying protective colloid for the carotenoid, and water into at least one feed hopper of a nitrogen gas purged extruder having an extruder barrel and an extruder screw, (ii) operating the extruder so as to emulsify the emulsion ingredients in the extruder barrel to thereby form an emulsified dispersion of dispersion droplets having an average droplet size (d.sub.3,2) between 50 nm and 1000 nm consisting of the carotenoid dispersed within the modified food starch as an emulsifying protective colloid for the carotenoid, and (ii) extruding the emulsified dispersion consisting of the dispersion droplets dispersed within the modified food starch from the extruder barrel to form an extrudate which consists of the dispersion droplets dispersed within the modified food starch.

2. The process according to claim 1, wherein the process is carried out in the absence of an organic solvent.

3. The process according to claim 1, wherein the carotenoid is at least one selected from the group consisting of -carotene, -carotene, 8-apo--carotenal, 8-apo--carotenoic acid esters, canthaxanthin, astaxanthin, lycopene, lutein, zeaxanthin and crocetin.

4. The process according to claim 1, wherein the carotenoid is -carotene.

5. The process according to claim 1, wherein the at least one carotenoid is present in step (i) in an amount of 0.5 wt-% 50 wt-%, based on the total weight of the extrudate.

6. The process according to claim 1, wherein the modified food starch is present in step (i) in an amount of 5 wt-% 80 wt-%, based on the total weight of the extrudate.

7. The process according to claim 1, wherein the water is present in step (i) in an amount of 1 wt-%-90 wt-%, based on the total weight of the extrudate.

8. The process according to claim 7, wherein the water is present in an amount of 5 wt-%-30 wt-%, based on the total weight of the extrudate.

9. The process according to claim 1, wherein the emulsion ingredients of step (i) further consist of 0.1 wt-%-50 wt-%, based on the total weight of the extrudate, of at least one auxiliary agent.

10. The process according to claim 9, wherein the auxiliary agent is at least one selected from the group consisting of antioxidants, ethoxyquin, plasticisers, stabilisers, humectants, protective colloids without emulsifying properties, gelling agents, dyes, fragrances, fillers and buffers.

11. The process according to claim 1, wherein the step (i) comprises sequentially adding to the extruder (1) the modified food starch as an emulsifying protective colloid for the at least one carotenoid, (2) the water and thereafter (3) the at least one carotenoid.

12. The process according to claim 1, wherein the carotenoid is -carotene, and wherein step (i) comprises adding the -carotene in a molten form to the extruder in advance of the at least one emulsifying protective colloid and the water.

13. The process according to claim 1, wherein the carotenoid is -carotene, and wherein step (i) comprises adding the -carotene to the extruder as a powder.

14. The process according to claim 1, wherein the temperature inside the extruder is between 20 C. and 220 C.

15. The process according to claim 1, wherein the total residence time for the ingredients is between 1 and 400 s.

16. The process according to claim 13, wherein step (i) comprises adding the -carotene to the extruder in a mixture with the modified food starch.

17. A food, feed or personal care product which comprises an extrudate obtained by the process of claim 1.

Description

EXAMPLES

Example 1: Dispersion of -Carotene in Modified Food Starch

(1) The extrusion dispersion of -carotene in 10.5 g modified food starch was conducted on a laboratory-scale conical twin-screw (batch) extruder (DSM Xplore 15 ml micro-compounder). 10.5 g of modified food starch (HICAP 100, National Starch), was mixed with 0.75 g of -carotene (DSM Nutritional Products) and 3.75 g demineralized water. The extruder was operated at a screw speed of 120 rpm and a barrel temperature of 200 C. The feed hopper and extruder were purged with nitrogen. The mixture was placed in the feed hopper and allowed to pass once through the extruder.

(2) The obtained extrudate was partly soluble in water resulting in an orange, cloudy solution stable over 12 hours. This solution was filtered either with a folded filter paper (grade 597: 5-7 m) or a syringe driven filter unit (0.22 m). Filtration with the larger pores resulted in a turbid, light-yellow solution, while the solution from the fine filter was clear. The hydrodynamic droplet size in these solutions was measured by dynamic light scattering (Malvern Zetasizer). The average droplet size (Z-Average) in the clear solution was 184 nm, while the turbid solution also contained some larger droplets/particles resulting in a Z-Average of 625 nm.