BEETLE POWDER AND METHOD FOR RAISING BEETLES COMPRISING AN ULTRAVIOLET TREATMENT FOR PREPARING SUCH A POWDER

Abstract

The present invention relates to:—on one hand, a beetle powder including a percentage by weight of vitamin D3 greater than or equal to at least 0.00001% and a percentage by weight of calcium greater than or equal to at least 0.1%, the percentages by weight being given on the total weight of beetle powder, and—on the other, a method for rearing beetles for preparing such a powder, which includes a light treatment phase during which a UV source emits ultraviolet rays towards the beetles.

Claims

1. A beetle powder comprising: a percentage by weight of vitamin D3 greater than or equal to at least 0.00001.0%, the percentage by weight being given on a total weight of beetle powder.

2. The beetle powder according to claim 1, wherein the percentage by weight of vitamin D3 is greater than or equal to at least 0.000015%.

3. The beetle powder according to claim 1, wherein the percentage by weight of vitamin D3 is greater than or equal to at least 0.000025%.

4. The beetle powder according to claim 1, further comprising a percentage by weight of calcium greater than or equal to at least 0.1%, the percentage by weight being given on the total weight of beetle powder.

5. The beetle powder according to claim 1 further comprising a percentage by weight of fat between 5% and 40%, the percentage by weight being given on the total weight of beetle powder.

6. The beetle powder according to claim 1, which has a water activity less than 0.7.

7. A method for rearing beetles for preparing a beetle powder having a percentage by weight of vitamin D3 greater than or equal to at least 0.000010%, said percentage by weight being given on a total weight of beetle powder, the method comprising applying a light treatment phase during which a UV source emits ultraviolet rays towards the beetles.

8. The method according to claim 7, wherein the light treatment phase is applied during a larval stage and/or a nymph stage of the beetles.

9. The method according to claim 8, wherein the light treatment stage starts between the sixth week and the twelfth week of growth of the larvae, preferably between the ninth and the eleventh week.

10. The method according to claim 7, wherein the light treatment phase has a treatment duration between one and six weeks, preferably between two and four weeks.

11. The method according to claim 7, wherein the ultraviolet rays emitted by the UV source towards the beetle larvae comprise: UVB type and consist of electromagnetic radiation wherein the wavelength is between 280 nm and 320 nm, and/or UVA type and consist of electromagnetic radiation wherein the wavelength is between 320 nm and 400 nm.

12. The method according to claim 7, further comprising, during the light treatment phase, positioning the UV source is at a defined distance from the beetle larvae of the order of 2 to 250 cm.

13. The method according to claim 12, wherein the distance between the UV source and the beetle larvae is between 10 and 100 cm.

14. The method according to claim 12, wherein the distance between the UV source and the beetle larvae is between 15 and 50 cm.

15. The method according to claim 7, wherein the UV source has a radiation power between 13 and 125 Watts.

16. The method according to claim 15, wherein the radiation power is between 20 and 50 Watts.

17. The method according to claim 7, wherein during the light treatment phase, the UV source emits the ultraviolet rays towards the beetle larvae according to treatment periods between ten hours and twenty-four hours continuously or cumulatively over a twenty-four hour period.

18. The method according to claim 7, wherein the beetle larvae are kept in an environment having a substantially constant temperature between 24 and 30° C., preferably between 26 and 28° C.

19. The method according to claim 7, wherein the beetle larvae are kept in an environment having a substantially constant hygrometry between 45 and 70% relative humidity, preferably between 55 and 65%.

20. The method according to claim 7, further comprising, prior to the start of the light treatment phase, applying an initial darkness phase during which, after hatching the beetle larvae, the larvae are kept in darkness between twelve and twenty-two hours per day, preferably between eighteen and twenty hours per day.

21. (canceled)

22. The method according to claim 7, wherein the beetle larvae are fed with a diet based on plants and/or vegetables.

23. The method according to claim 7, wherein the beetle species are selected from a group consisting of Tenebrio molitor, and Alphitobus diaperinus.

24. A use of a beetle powder according to claim 1 in human or animal nutrition.

25. The use according to claim 24, the powder is used as a nutritional supplement.

26. The method according to claim 20, wherein the beetle larvae are kept in an environment having a substantially constant temperature between 24 and 30° C., preferably between 26 and 28° C., and having a substantially constant hygrometry between 45 and 70% relative humidity, preferably between 55 and 65%, the method further comprising: controlling the temperature and/or hygrometry of the environment of the beetle larvae such that, between the darkness and light treatment phases, a difference in temperatures is less than or equal to 2° C. and/or a difference in hygrometries is less than or equal to 10% relative humidity.

Description

DETAILED DESCRIPTION RELATING TO DIFFERENT EXAMPLES

[0069] The following examples are given merely by way of illustration of the invention in respect of which they have no limiting nature.

[0070] The rearing method that will be described herein is intended to develop a technique to significantly increase the vitamin D3 content in live Tenebrio molitor or Alphitobius diaperinus and/or in the associated powder obtained after processing without involving increasing addition of vitamin D3 in the insect feed during the larval stage as known in the prior art.

[0071] For the purposes of clarity and conciseness, the term beetles hereinafter in the description denotes the following species: Tenebrio molitor and/or Alphitobius diaperinus.

[0072] It is known that it is possible to vary the quantities of nutrients present in beetles according to the stage during growth, the type of feed, the processing method and the quality of the packaging and storage.

[0073] The underlying concept of the present invention is therefore that of using a UV treatment on beetles to increase the vitamin D3 content, without vitamin D3 supplementation in the feed.

[0074] The rearing method thus comprises several phases which will be described hereinafter in the description.

Initial Phase

[0075] The formulation and quantities of feed for the beetle larvae are controlled from hatching to prevent any bias in the trials.

[0076] After hatching, the larvae are kept in plastic containers at a temperature between 24 and 30° C., more preferentially between 26 and 28° C. and a hygrometry between 45 and 70% relative humidity, more preferentially between 55 and 65% relative humidity.

[0077] Before the light treatment phase that will follow this phase, the larvae are kept in darkness between 12 and 22 hours per day, more preferentially between 18 and 20 h per day.

[0078] In each container, the larva density is optimised to obtain a mortality rate close to 0 on the growth cycle between 10 and 16 weeks, more preferentially between 11 and 13 weeks.

[0079] The feed supplied to the larvae is 100% plant-based.

[0080] The quantities of feed are adapted to the numbers of larvae and to the development stage thereof.

[0081] In the example described herein, it is envisaged from the sixth week of growth to give the larvae pre-cleaned vegetables in suitable quantities for the numbers of larvae and the development stage thereof.

Light Treatment or UV Treatment Phase

[0082] In the various tests conducted, a light treatment during which a UV source emits UVA and/or UVB towards the beetles is performed during this phase.

[0083] The various tests demonstrate that the intensity of the ultraviolet treatment will directly impact the vitamin D3 in the larvae.

[0084] This vitamin D3 intensity will depend on several factors: the distance from the UV source, the power of the UV source, the treatment frequency, the treatment duration, and the treatment period.

[0085] The distance of the ultraviolet source with respect to the larvae must be positioned between 15 and 50 cm. This distance helping limit the impact on the larvae of the inherent heat supply of the UV source.

[0086] The power of the ultraviolet source must be between 20 and 50 Watts. This power helping limit the impact on the larvae of the inherent heat supply of the UV source.

[0087] Over a day of treatment including 24 hours, the treatment frequency comprises UV treatment periods between 10 h and 24 h continuously or cumulatively over the 24 h. These treatment periods induce greater vitamin D3 synthesis. The larvae are kept in complete darkness when the UV treatment is absent.

[0088] The treatment duration is between 1 and 6 weeks, more preferentially between 2 and 4 weeks. These durations make it possible to obtain appropriate vitamin D3 contents for the use of the powder as a nutritional supplement.

[0089] The treatment can start between the 6th week and the 12th week of growth of the larvae, preferably between the 9th and 11th week. This period corresponds to optimal larva sizes.

[0090] The emission spectrum of the ultraviolet source comprises electromagnetic radiation with wavelengths between 280 and 400 nm.

[0091] Preferably, the temperature and the relative humidity for each of the phases were controlled so that there was not more than 2° C. and 10% RH in difference in particular between the treatments with and without lamps (initial phase and UV treatment phase).

[0092] The larvae are then processed as described in the next paragraph.

Processing Phase

[0093] Between the 6th and 14th week of growth, more preferentially between the 10th and 13th week of growth, the larvae are sieved to remove excrement.

[0094] The sieved larvae are then placed in a plastic container for a fasting period of 24 to 48 hours.

[0095] After fasting, the larvae are once again sieved to remove excrement.

[0096] The larvae are placed in water between 85° C. and 100° C. to be killed for 1 to 4 minutes.

[0097] During this processing, immediately before killing, a stunning step between 0 and 4° C. for several minutes is further envisaged.

[0098] After the killing, the larvae are placed at a temperature between 50 and 150° C. for a duration between 1 h 20 and 24 h according to the temperature use. The larvae obtained contain between 2 and 15% water, more preferentially between 3 and 8% water and a water activity less than 0.7

[0099] The reduction into powder is then obtained by grinding.

[0100] The term powder includes herein any reduction to an element less than 3 mm of the whole insects in the larval or nymph stage thereof or merely of a body part of these insects.

TESTS AND RESULTS

[0101] To demonstrate the influence of UVA and UVB on the vitamin D concentration in beetle larvae, several tests were conducted on larvae aged from 6 to 12 weeks and more preferentially aged from 9 to 11 weeks: [0102] “UV+/D3+” Test:

[0103] A container containing 500 g of larvae was placed under a UVA-UVB fluorescent lamp 30 cm above the container. The larvae were fed from the hatching thereof with feed supplemented with vitamin D3 (2500 IU/1000 g). [0104] “UV+/D3−” Test:

[0105] A container containing 500 g of larvae was placed under a UVA-UVB fluorescent lamp 30 cm above the container. The larvae were fed from the hatching thereof with feed devoid of vitamin D3. [0106] “UV−/D3+” Test:

[0107] a container containing 500 g of larvae was placed under a visible-light halogen lamp (“Warm white”, 2700K) 30 cm above the container containing no UV emission. The larvae were fed from the hatching thereof with feed supplemented with vitamin D3 (2500 IU/1000 g).

[0108] The term visible light denotes electromagnetic radiation wherein the wavelength is between 400 nm and 700 nm. [0109] “Dark Ctrl” Test:

[0110] A container containing 500 g was placed in 24 h darkness for a similar period to that of the light treatment tests.

[0111] The results of these tests are appended to the present description and show the vitamin D3 content.

[0112] The vitamin D3 quantification analyses were carried out by an independent Cofrac-certified laboratory. The quantification is carried out by semi-preparative HPLC followed by reverse-phase HPLC with UV/DAD detector (265 nm).

[0113] These results show the influence of UVB on the vitamin D3 concentration. In the “UV+/D3+” and “UV+/D3−” tests conducted herein, it is demonstrated that a UV-based light treatment makes it possible to multiply the vitamin D3 content to 13.

[0114] It will be noted that vitamin D3 supplementation during the treatment improves yields. On the other hand, without supplementation, the vitamin D3 content is multiplied by 5, which is very satisfactory in terms of performance.

[0115] Indeed, the analyses demonstrate that the concentration changes from 2 μg/100 g to 26 μg/100 g under the effect of a UV treatment during the larval stage.

[0116] On the other hand, a light treatment using light from the visible spectrum (400-700 nm) does not give rise to an increase in the vitamin D3 content in larvae.

[0117] Therefore, the UV trigger vitamin D3 synthesis even in the absence of supplementation in the feed.

[0118] The present invention therefore relates to the method for rearing beetles for preparing a beetle powder as well as the powder obtained from beetles reared according to the rearing method as described above.

[0119] It should be observed that this detailed description relates to a specific embodiment example of the present invention, but that this description in no way applies any limiting nature to the subject matter of the invention; on the contrary, it is intended to remove any inaccuracy or any incorrect interpretation of the following claims.

[0120] It should also be observed that the reference signs placed between parentheses in the following claims are in no way limiting; these signs are merely intended to improve the intelligibility and comprehension of the following claims as well as the scope of the protection sought.

APPENDIX

[0121]

TABLE-US-00001 Test Vitamin D3 concentration (μg/100 g) UV+/D3+ 10 UV+/D3− 26 UV−/D3+ 1.66 Dark Crtl 2