COATED DRIED ACTIVE YEASTS AND FOOD PRODUCTS CONTAINING THE SAME

Abstract

The invention relates to yeasts comprising a protection coating made of one or more compounds which are inert relative to said yeasts, characterized in that the yeasts are dried active yeasts. Application in the preparation of food products for animals.

Claims

1. A yeast with a protective coating made of one or more compounds which are inert relative to said yeast, wherein the yeast is an active dry yeast, commonly referred to as ADY.

2. The yeast as claimed in claim 1, wherein the coating is formed from compounds selected from the group consisting of fatty acids, sugars, natural or synthetic polymers and proteins.

3. The yeast as claimed in claim 1, wherein the coating is produced from a mixture of stearic acid and palmitic acid.

4. The yeast as claimed in claim 1, wherein a proportion of coating agent relative to the yeast is from 10% to 90% by weight of a total mass of a final product.

5. The yeast as claimed in claim 1, wherein the yeast is Saccharomyces.

6. The yeast as claimed in claim 1, wherein the yeast is Saccharomyces cerevisiae.

7. The yeast as claimed in claim 1, wherein the yeast is in a form of beads.

8. A food product for livestock or pets, wherein the food product is in a form of granules and contains, as probiotic additives, the yeast according to claim 1.

9. The food product as claimed in claim 8, wherein the food is adapted for livestock, and said yeast is present in a proportion of from 100 to 1000 g/tonne.

10. The food product as claimed in claim 8, wherein the food is adapted for livestock, and said yeast is present in a proportion of from 300 to 700 g/tonne.

11. The food product as claimed in claim 8, wherein the food is adapted for livestock, and said yeast is present in a proportion of an order of 500 g/tonne.

12. A method of obtaining the yeast as claimed in claim 1, comprising: coating the active dry yeast which are in a form of spherical particles, with the one or more compounds which are inert relative to said yeast, so as to form a protective layer.

13. A method for preparing a food product for livestock or pets, comprising: Granulating a mixture, in a form of meal, of a food product with a yeast as claimed in claim 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

Example 1

[0032] A probiotic yeast strain (Saccharomyces cerevisiae, strain deposited with the CNCM [French National Collection of Microorganism Cultures] under No. I-1077) was produced according to two different methods, resulting in two types of particles: instant dry yeast (IDY) and active dry yeast (ADY); these two methods are described, for example, in Food and Agricultural Industry 1/95, pages 9.13.4-1 to 9.13.4-3, or more particularly, for the IDY, in U.S. Pat. No. 3,843,800.

[0033] The two types of particles were then coated with a mixture of stearic acid and palmitic acid (50/50% by weight) according to the method described in FR 00 03409.

[0034] The particles obtained, and also the uncoated ADY and IDY particles, were incorporated, in a proportion of 500 grams per tonne, into a food product for cattle having the following composition:

TABLE-US-00001 Starting material % by weight Wheat bran 35 Corn 26 Soybean cake 21 Beetroot molasses 10 Dehydrated alfalfa 5 Calcium carbonate 1.95 Premix of vitamins and minerals 1 Yeast 0.05

[0035] The mixture obtained, in the form of meal, was introduced into a Sogem granulation press, type T 90 60 cv, equipped with a die which has a through-diameter of 4.5 mm and a thickness of 45 mm. The granule output temperature was 85° C. 4 batches of food product, each of one tonne, were produced: [0036] one batch containing the uncoated IDY yeast [0037] one batch containing the uncoated ADY yeast [0038] one batch containing the coated IDY yeast [0039] one batch containing the coated ADY yeast.

[0040] The contents of viable yeast (CFU) were analyzed in the meals and the granules of each batch.

[0041] The results are given in the following table:

TABLE-US-00002 Type of CFU/g in CFU/g in % loss of yeast meal granules viability Uncoated IDY 1.2 × 10.sup.7 2.0 × 10.sup.4 99.8 Uncoated ADY 1.1 × 10.sup.7 1.6 × 10.sup.5 98.6 Coated IDY 5.6 × 10.sup.6 4.5 × 10.sup.5 92 Coated ADY 4.9 × 10.sup.6 3.9 × 10.sup.6 20

[0042] Examination of this table shows that only the coated ADY yeast does not undergo a high loss of viability at the end of the granulation step. The loss of viability in fact represents only 20%, whereas it reaches 92% with the coated IDY yeast. The synergic effect of the coating on the resistance to granulation is also apparent from the results obtained.

Example 2

[0043] A probiotic yeast strain (Saccharomyces cerevisiae, strain deposited with the CNCM under No. I-1079) was produced according to two different methods, resulting in two types of particles: instant dry yeast (IDY) and active dry yeast (ADY).

[0044] The two types of particles were then coated with a mixture of stearic acid and palmitic acid (50/50% by weight) as in Example 1 above.

[0045] The coated particles obtained, and also the uncoated ADY and IDY particles, were incorporated, in a proportion of 0.1%, into a food product for pigs having the following composition:

TABLE-US-00003 Starting material % by weight Barley 38 Wheat 25 Soybean cake 25 Wheat bran 6 Fat 3 Calcium carbonate 1.9 Premix of vitamins and minerals 1 Yeast 0.1

[0046] The mixture obtained, in the form of meal, was introduced into a Kahl laboratory granulation press (type 14-175), equipped with a die which has a through-diameter of 4 mm. The granule output temperature was 82° C. 4 batches of food product, each of 50 kg, were produced: [0047] one batch containing the uncoated IDY yeast [0048] one batch containing the uncoated ADY yeast [0049] one batch containing the coated IDY yeast [0050] one batch containing the coated ADY yeast.

[0051] The contents of viable yeast (CFU) were analyzed in the meals and the granules of each batch.

[0052] The results are given in the following table:

TABLE-US-00004 Type of CFU/g in CFU/g in % loss of yeast meal granules viability Uncoated IDY 1.84 × 10.sup.7  7.9 × 10.sup.5 95.7 Uncoated ADY 2.02 × 10.sup.7 1.95 × 10.sup.6 90.3 Coated IDY  1.1 × 10.sup.7 2.15 × 1.sup.6  80.5 Coated ADY 1.13 × 10.sup.7 9.34 × 10.sup.6 17.3

[0053] As in Example 1, the resistance to granulation of the ADY yeast is greatly increased after coating and the percentage loss of viability is low compared with that observed with the coated IDY yeast.

[0054] By virtue of the specific choice of the ADY yeast, the invention provides means of great value for obtaining food products having notable probiotic properties.