ENCAPSULATED FOOD PRODUCTS AND METHODS OF MAKING SAME

Abstract

The present disclosure relates to a method of preparing non-gelatin soft capsules filled with an edible semi-solid or liquid material, the method comprising the general step of thermoforming a gentled film (membrane) into capsule that will be filled with (primarily) food and/or beverages.

Claims

1. A non-gelatin soft capsule for encapsulating an edible semi-solid or a liquid material comprising a membrane comprising: a) an hydrocolloid mixture; b) at least one phospholipid; c) at least one plasticizer; and d) at least one sugar.

2. The capsule of claim 1, wherein the hydrocolloid mixture comprises at least one of carrageenan, gum arabic, methyl cellulose hydroxypropyl, methyl cellulose, starch, and a mixture thereof.

3. The capsule of claim 2, wherein said starch is corn starch, water chesnut starch or maltodextrin.

4. The capsule of claim 1, wherein the at least one plasticizer is at least one of glycerin, polyethylene glycol, sorbitol, polyol, and a mixture thereof.

5. The capsule of claim 1, wherein the at least one sugar is at least one of glucose, fructose, galactose, sucrose, dextrose, and a mixture thereof.

6. The capsule of claim 1, wherein the at least one phospholipid is lecithin.

7-11. (canceled)

12. The capsule of any one of claim 1, wherein said membrane has a pH of between 4 and 8.

13-17. (canceled)

18. The capsule of claim 1, further comprising an anti-tacking or a softening agent.

19. The capsule of claim 1, wherein said membrane has a viscosity of from 1 to 10 Pa.s.

20-21. (canceled)

22. The capsule of claim 1, wherein said capsule has volume between 1 ml to 10 ml.

23. (canceled)

24. The capsule of claim 1, wherein said capsule has a volume for containing at least 1 g to 10 g of material.

25-26. (canceled)

27. The capsule of claim 1, wherein said membrane has an elasticity of around 64%.

28-37. (canceled)

38. The capsule of claim 1, wherein the material is a fruit, a vegetable tree sap, tea, coffee, syrup, honey, a dairy product, an alcoholic beverage, a functional or health enhancing ingredient, maltodextrin, dextrose, or a preparation of medicinal substances or pharmaceutical formulation.

39-42. (canceled)

43. A process for manufacturing the non-gelatin soft capsule of claim 1 encapsulating an edible semi-solid or a liquid material comprising the steps of: a) mixing an hydrocolloid, at least one phospholipid, at least one plasticizer and at least one sugar; b) heating said mixture at a temperature of about 60 C. to about 100 C. forming a membrane; c) reducing or removing all air bubbles in the membrane; d) shaping the membrane into the capsule; and e) depositing or injecting the material in said capsule.

44. The process of claim 43, wherein the mixture is heated at a temperature between 75 C. and 95 C.

45. The process of claim 43, wherein the air bubbles are reduced or removed by applying a vacuum.

46. (canceled)

47. The process of claim 45, wherein the vacuum is applied at a pressure of on or about 75 kPa.

48. The process of CLAIM 43, further comprising the step of applying at least one barrier layer on the interior or exterior surface of the membrane.

49. (canceled)

50. The process of claim 48, wherein the at least one barrier layer and bonding agent are applied before, during or after the thermoforming of capsules.

51-53. (canceled)

54. The process of claim 48, wherein the membrane is formed by extruding through two extrusion dies or casting said mixture to form the membrane.

55-62. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0087] FIG. 1 illustrates photographic representations of the capsule according to one embodiment described herein.

DETAILED DESCRIPTION

[0088] It is provided a non-gelatin soft capsule encapsulating edible semi-solid or liquid materials and a process for making same.

[0089] Current methods of making capsules in a bite size format rely on spherification and on the use of alginate as the main gelling agent, which produce a fragile sphere with very poor water barrier properties. Initial experimentation conducted with the process of spherification and reverse spherification further confirmed these limitations. These limitations have led to the development of a non-alginate based mixture and of processes more suitable for a longer shelf life of capsules, as well as for large-scale manufacturing processes such as thermoforming processes.

[0090] Thus, it is provided herein a non-gelatin gel mixture that can be used with thermoforming processes for making capsules. The final product is a capsule that creates a bursting effect in the mouth when chewing on it. It can be chewed and dissolves rapidly in the mouth. It is an edible object created primarily for the food and beverage industry. The capsules produces can be advantageously of a larger size than what is commercially available. The capsule varies in shape and in volume with an average volume of 7 ml for example. It is also encompassed a bite size or sip size format, which is of larger size than what is commercially produced by way of spherification or encapsulation. The filling materials take part in the taste experience of the capsule and include ingredients such as fruit and vegetable juices and/or powders, and/or pures; alcoholic beverages; spices; aromas, and/or other flavours and the like or a mixture thereof or equivalents thereof. Due to the high barrier properties of the membrane, and of added water barrier layer or layers, the capsule has a longer shelf life than capsules produced by existing methods. The capsule is formed, filled, sealed and cut with said suitable ingredients in a continuous or non-continuous process. The continuous process relates to the processes such as the encapsulation process. Non-continuous processes for making capsules relates to at least a two-step process including for example compression thermoforming of two capsule portions, and filling, sealing and cutting the capsules. Both continuous and non-continuous processes permit the production of diverse well-defined shapes. Thermoforming is commonly used in the food industry; however, it has not been used for making large size capsules. The capsule is packaged in a non-aqueous medium making it easy to handle from the hand to the mouth.

[0091] In an embodiment, it is provided a method of making an edible membrane (also referred as a matrix or shell interchangeably herein) to encapsulate edible semi-solid or liquid materials by way of thermoforming processes. An example of such capsule is seen in FIG. 1.

[0092] As encompassed herein, the membrane is made from a hydrocolloid-based mixture that excludes the use of alginate, providing the desired gelling characteristics and textural properties. Preliminary tests have been conducted to evaluate spherification as a potential process for industrial production of soft edible capsules. The initial experimentation as mentioned hereinabove conducted with alginate and spherification spherification has confirmed the limitations of the spherification process and led to the choice of a non-alginate based mixture. The freezing of the filling material considerably limited the range of edible substances to be encapsulated. In addition, tests made with alginate following the reverse spherification process presented syneresis within two hours (see Example I). Optimized alginate mixture including ingredients such as gum arabic and agar agar, have shown syneresis 24 hours after the spheres were produced (see Example I). As a result, the matrix of the sphere tears rapidly.

[0093] As described herein, a gel mixture formulation has been developed to make a soft but more resistant edible membrane and capsule that does not need to be stored in an aqueous solution and provides a longer shelf-life.

[0094] In an embodiment, the capsule comprises a bursting effect in the mouth from the filling material liberated when chewing on the capsule. The dimension of the capsule, and the thickness and texture of the shell material contribute to the bursting effect in the mouth.

[0095] In an embodiment, it is provided a method of making a large size edible capsule of approximately 7 ml in volume for sip size format and approximately 7 g for bite size format. The capsules can be produced in a variety of sizes and shapes with volumes ranging from 1 ml to 10 ml or from 1 g to 10 g. For example, in a preferred embodiment, a spherical capsule of 25 mm in diameter of an average of 7 ml of filling material is produced. The capsule can be equivalent in volume to a food bite or a sip of liquid.

[0096] In an embodiment, the method described herein provides a thin membrane, with thickness varying from 0.9 mm to 1.8 mm, suitable for food consumption and providing a good mouth feel. The method described herein also provides a soft but resistant membrane and capsule.

[0097] The thermoformed gelified membrane described herein produces a dense matrix, which may act as a liquid and vapor barrier. Hence, the thermoformed gelified membrane reduces the liquid and vapor transfer from the filling to the membrane, providing longer shelf life than existing products produced by known methods producing large size capsules, with a shelf life for the capsule described herein that varies between one week and three months according to the filling material encapsulated.

[0098] The shelf life of the gelified capsule may be extended by forming multiple food layers inside or outside the capsule, before, during or following the thermoforming of the capsule.

[0099] As described herein, more resistant hydrocolloid combinations have been developed to create a longer shelf-life product.

[0100] In an embodiment, the gel membrane is made from a mixture of: i) hydrocolloids including carrageenan, gum arabic, methyl cellulose hydroxypropyl, methyl cellulose, and/or starch such as corn starch, water chesnut starch, maltodextrin or equivalents thereof; ii) at least one plasticizer selected from a group consisting of glycerin, polyethylene glycol, sorbitol, polyol, and others of the sort or a mixture thereof; iii) at least one sugar such as glucose, fructose, galactose, sucrose, dextrose, and others of the sort or a mixture thereof; and iv) at least one phospholipid such as lecithin.

[0101] In some embodiments, the combination of hydrocolloids may include: gellan, xanthan gum, locust bean gum, inulin from Jerusalem artichoke, chicory or other oligosaccharides, and others of the sort or a mixture thereof.

[0102] In some embodiments, the mixture also includes wax such as beeswax, carnauba wax, candelilla wax, and others of the sort or a mixture thereof.

[0103] In some embodiments, the mixture also includes a resin such as shellac.

[0104] In some embodiments, the mixture also includes a fatty acid such as stearic acid.

[0105] In some embodiments, the mixture also includes one monovalent or divalent cation, such as sodium, potassium, and calcium salts, and others of the sort or a mixture thereof.

[0106] In some embodiments, the cations may be applied to the membrane by way of spray solution.

[0107] In one embodiment, the pH of the membrane is between 4 and 8. The carrageenan is more efficient at a pH of 4,5. Accordingly, the mixture can include a pH buffer.

[0108] The gel membrane may include inexhaustible range of flavors and aromas to create flavor pairing with the filling material.

[0109] In some embodiments, the mixture may further include flavoring ingredients. The capsules shell can neutral in taste or flavored to complete, match or contrast the tasting of the semi-solid or liquid core. The mixture can offer inexhaustible range of flavor combinations. By way of example, the shell could include in its components: fruit extracts and/or vegetable extracts and concentrates, from for example cranberries, blueberries, broccoli, onion, plant and botanical extracts, aromas, and others of the sort or a mixture thereof.

[0110] In some embodiments, the mixture can include functional and/or health enhancing ingredients such as fruit extracts and/or vegetable extracts and concentrates, antioxidants, plant and botanical extracts, prebiotic and probiotic, and the like or a mixture thereof or equivalents thereof.

[0111] In some embodiments, the mixture further comprises an anti-tacking and/or a softening agent.

[0112] As described herein, the viscosity of the mixture may vary from 1 to 10 Pa.s according to the thermoforming process utilized to produce capsules. The mixture can comprise a viscosity enhancer if needed.

[0113] In some embodiments, the mixture further comprises a preservative.

[0114] In another embodiment, the mixture can be transparent or opaque, comprising visible natural coloring additives. The gelified membrane remains stable with the addition into the gel mixture of natural coloring additives in a liquid form.

[0115] The membrane described herein presents functional properties contributing to making the membrane a significantly greater water barrier than membranes produced by spherification or encapsulation, and a resistant shell. Functional properties of gelified membrane include: i) stability of membrane in contact with the liquid content; ii) low percentage of solid and liquid material transfer between the filling and the membrane; iii) high elasticity; and iv) high firmness.

[0116] Accordingly, transfer of solids contained in the membrane to the liquid filling material is around 9% and stable after 24 hours. Membrane samples of 43 mm in diameter have been individually immersed in a beaker filled with apple juice for a period of three months at 4 C. The weight of solid content transferred from the membrane to the juice has been measured at different moments from 24 hours, up to three months with a Sartorius MA45.

[0117] The transfer of liquid from the filling material into the membrane (absorption amount) is around 14%, reduces of around 2% between one to five days, and remains stable after. Membrane samples of 43 mm in diameter have been individually immersed in a beaker filled with apple juice for a period of three months at 4 C. The weight of liquid content transferred from the liquid filling to the membrane has been measured by weighing the membrane during the test time.

[0118] The membrane described herein is stable in contact with a liquid filling. The membrane mixture does not dissolve in contact with a liquid filling material. Observation of the integrity of the texture of the membranes shows it remains stable over a period of three months.

[0119] In an embodiment, the elasticity of the membrane is around 64%. Elasticity tests were performed with Stable Micro System TA-xT2i Texture Analyzer. A specific method was developed for this test. The elasticity was measured in static mode and the membrane was subjected to a growing load. A strip of membrane was placed between two plates. Every plate has a hole of 15 mm in diameter in the center. By this method, a punch, with a spherical tip of 8 mm in diameter exercises a force on the surface of the membrane up to the point of rupture. The more the membrane is resistant, the more the punch sinks into the membrane and deforms it. For a diameter of 15 mm, the increase of the length of the film before rupture was 9.7 mm.

[0120] In an embodiment, the firmness of the membrane is between 29 g and 107 g. Firmness tests were also performed with Stable Micro System TA-xT2i Texture Analyzer, following the same procedure as the one used for the elasticity test. Strips of membranes were deforming under the applied force of 29 g to 107 g before the membrane deformed.

[0121] In comparison with the alginate membrane produced following the known method of spherification, the membrane as described herein, which has similar humidity content, shows greater mechanical strength, and presents high water barrier properties. The alginate membrane is too fragile to be submitted to measures of firmness, rigidity and elasticity. Mechanical parameters are included in table 1 for comparison.

TABLE-US-00001 TABLE 1 Comparative analysis between an alginate membrane and the said membrane Alginate membrane Said membrane Humidity 68.97% 61% Density 0.83 g/ml 1.07 g/ml Thickness 0.41 mm 0.9 mm-1.5 mm Firmness na 10 g Rigidity na 71 g/s Elasticity na 45%

[0122] In some embodiments, the membrane may receive on the interior or exterior surface a barrier layer or layers that may further reduce or prevent the migration of water present in the filling through the membrane as well as water vapour migration. The layer or layers may be applied before or during the thermoforming process.

[0123] Ingredients suitable for use as encompassed herein for the barrier layer or layers include: resins, plasticizers such as glycerine, wax such as beeswax, carnauba wax, candelilla wax, and bonding agents such as emulsifiers, emulsifying hydrocolloids, phospholipids, milk proteins, and fats such as cocoa butter.

[0124] In some embodiments, a bonding layer may be applied between the membrane and the barrier layer and/or between the barrier layers to insure better adhesion of the barrier layer or layers on the capsule.

[0125] Suitable ingredients for making the bonding layer or layers include: emulsifiers, emulsifying hydrocolloids, phospholipids, milk proteins, and fats.

[0126] As encompassed herein, the filling material include liquid or semi-liquid ingredients, from fruits and vegetables (juice, powder and/or puree), tree sap, tea, coffee, syrups, honey, dairy products and alternatives, alcoholic beverages including ice cider, ice wine, spirits, mixed drinks, or any beverages containing around 10% of solids; flavoring ingredients including aromas; functional and/or health enhancing ingredients such as plant and botanical extracts, antioxidants, prebiotics and probiotics; maltodextrin, dextrose, and/or other stabilisers; preparation of medicinal substances or pharmaceutical formulation such as syrup; and the like or a mixture thereof or equivalents thereof.

[0127] In addition to the food and beverage industry, large-format capsules are particularly of interest to the pharmaceutical industry given that it allows greater dosage for formulations making capsules edible rather than ingestible and/or providing improved organoleptic properties compared to what is currently offered on the market.

[0128] In an embodiment, the filling material includes a pH buffer and/or a thickening agent.

[0129] In some embodiments, the filling material includes preservatives.

[0130] Due to the high barrier properties of the membrane, and of added water barrier layer or layers, the capsule has a longer shelf life than capsules produced by existing methods. Shelf life is in between 1 week to 3 months refrigerated.

[0131] It is thus provided an edible gelified membrane using the said mixture. The membrane is directed at encapsulating edible substances of a bite size format, and/or drinkable substances of a sip size format, using thermoforming processes adapted for the said membrane.

[0132] The present description relates to thermoforming processes, rather than the spherification process. Diverse methods of thermoforming may be utilized to make large size capsules. The methods for making the capsule may include a continuous or a non-continuous process. In all methods, a membrane is first made, and then shaped into half-portion capsules that are sealed and cut.

[0133] In general, the method described herein comprises the steps of: i) mixing the suitable ingredients to make the gel mixture ii) heating the mixture; iii) reducing or removing all air bubbles in the mixture iv) transferring the mixture to a mould or a machine configured for producing capsules.

[0134] The gel mixture is heated at temperature between 60 C. to about 100 C., preferable between 75 C. and 95 C.

[0135] In an embodiment, the process described herein comprises the step of applying a vacuum method to the mixture by way of diverse devices such as vacuum pump or deaerator, a vibrating table or other devices of the sort, at a pressure of on or about 75 kPa to reduce, remove or eliminate air, air bubbles and gas therefrom after the heating step.

[0136] The process described herein further comprises the step of maintaining the mixture at temperature between 60 C. to about 100 C., preferable between 75 C. and 95 C. until all air bubbles are removed from the mixture.

[0137] In an embodiment, one or more barrier layers may be applied on the interior or exterior surface of the membrane, to reduce the migration of filling material through the membrane. The barrier layer or layers may be applied on the membrane before or during the thermoforming process by way of coating processes such as spray chilling, spray cooling, powder coating, spray drying, brushing, dipping and complex coacervation.

[0138] In an embodiment, a bonding agent is utilized to insure better adhesion of the barrier layer or layers. The bonding layer may be applied between the membrane and the barrier layer and/or between the barrier layers. The bonding layer or layers may be applied before or during the thermoforming process by way of coating processes such as spray chilling, spray cooling, powder coating, spray drying, brushing, dipping and complex coacervation.

[0139] In one embodiment, methods of making capsules relate to a non-continuous process including the steps of i) thermoforming two capsule portions; and ii) filling, sealing and cutting the capsules in one simultaneous step or multiple steps. The thermoforming permits the production of diverse well-defined shapes. These methods replace current methods of forming and encapsulating food and beverage capsules.

[0140] The method of this embodiment further comprises the steps of: i) extruding through two extrusion dies or casting said suitable mixture to form a membrane of a thickness ranging from 0.9 to 1.8 mm; and ii) placing formed membrane in a die having a female mould and a male plug to thermoform by compression the two half portions of the capsule corresponding to the shape of desired capsule.

[0141] The mould can be heated to temperature of around 60 C. Afterwards, the mould can be cooled by cooling methods such as circulation of cold water in the mould.

[0142] In an embodiment, the filling is deposited in the first and the second half of preformed half capsules, and the two half capsules are sealed. The final shape of the filling material can be pre-shaped in a mould or frozen in a mould, deposited in one half, after which the two half capsules are sealed.

[0143] The filling and sealing of the two half portions and the cutting of the capsule can also be done by way of a second step or multiple steps, following a horizontal or vertical system. For example, the two half portions of the capsule can be sealed, and injected with the filling material. The filling material can alternatively be injected simultaneously as the two half portions of the capsule are sealed.

[0144] The process described herein improves the strength of the capsule membrane by way of compression of the mixture or of the preformed gelified membrane. The mixture or pre-formed membrane is heated at a temperature, moisture content and time sufficient to produce compact formed membrane.

[0145] Alternatively, in another embodiment, the membrane may be formed and filled with the suitable ingredients, in a single continuous operation by a form, fill, seal, and cut process. This one-step method of making capsules relates to the traditional art of making encapsulated bath beads, paint balls, and pharmaceuticals.

[0146] The process of this embodiment for producing capsules, further comprises the steps of transferring the suitable mixture to a machine configured for extruding the membrane.

[0147] In some embodiments of this process, the gel mixture has a viscosity higher than 4.5 Pa.s.

[0148] The mixture can be extruded through two extrusion dies directly into two tension rollers to form a membrane of a thickness ranging from 0.9 to 1.8 mm. Two extruded films are then passed over rotating dies which simultaneously form, fill, heat-seal and cut the capsules.

[0149] In some embodiments of the described process, the extruded membrane is dehydrated to obtain suitable texture and elasticity to pass through the tension rollers. In this embodiment, the softgel machine is modified to introduce a dehydrating device and/or casting mould to help solidify the membrane before it passes through the tension rollers.

[0150] In some embodiments, a new capsule die-mould, designed for better sealing performance of said membrane, is utilized. The membrane has been tested with both non-continuous and continuous processes using existing capsule die-moulds to examine the sealing performance of the moulds.

[0151] The capsule described herein can be dried to a desired moisture content and may present a smooth surface or a textured surface produced by the mould or by ways of embossing, spraying or printing image, figure, art, graphic, character, text and/or words.

[0152] The present disclosure will be more readily understood by referring to the following examples which are given to illustrate embodiments rather than to limit its scope.

EXAMPLE I

Production of Larger Capsules By Reverse Spherification

[0153] The process of reverse spherification was utilized to produce large size capsules. Two methods of preparation were performed. Only the reverse spherification of pre-frozen filling material was successful.

[0154] The first method includes the following steps: i) pour 5 ml of a solution of apple ice cider and lactate of calcium (0.75%) into the solution of sodium alginate; ii) maintain in 25 C. for 5 minutes; iii) extract the sphere by overturning slowly into a small sieve; and iv) rinse the sphere in distilled water. It was impossible with this method to form a gelified sphere with a liquid apple ice cider filling.

[0155] The second method includes the following steps: i) form an ice sphere by deep-freezing apple ice cider with calcium lactate (0.75%) at 31 C.; ii) drop the ice sphere in the sodium alginate solution; iii) maintain in 25 C. for 5 minutes; iv) extract the sphere by overturning slowly into a small sieve; and e) rinse the sphere in distilled water. This technique produced a gelified sphere with a liquid apple ice cider filling.

[0156] Spheres produced with sodium alginate, or sodium alginate and other hydrocolloids such as gum arabic, starches, celluloses, and with pectin, following the reverse spherification of a pre-frozen core presented syneresis within an hour:

[0157] Formulation 1

TABLE-US-00002 Alginate mixture Alginate 1.5% Pectin LM 0.5% Filling material Calcium lactate 0.75% Apple cider 5 ml

[0158] One sphere produced with alginate, gum arabic, and agar agar, following the reverse spherification of a pre-frozen core presented syneresis within around 24 h hour.

[0159] Formulation 2

TABLE-US-00003 Alginate mixture Alginate 1.5% Gum arabic 0.4% Agar agar 0.1 Filling material Calcium lactate 0.75% Apple cider 5 ml

EXAMPLE 2

Production of Larger Capsules with Mixture By Thermoforming Processes

[0160] The following spheres were prepared.

[0161] Formulation 1

TABLE-US-00004 % Membrane mixture Water 75 Carrageenan 3.7 Xanthan gum 0.25 Locust bean gum 0.25 Gum arabic 1.2 Dextrose 0.10 Glycerine 15 Stearic acid 4 Lecithin 0.5 Filling material Gin 2.5 Apple ice wine 3.5 Cinnamon

[0162] Formulation 2

TABLE-US-00005 % Membrane mixture Water 75 Carrageenan 3.7 Xanthan gum 0.25 Locust bean gum 0.25 Gum arabic 1.2 Dextrose 0.10 Glycerine 18.5 Methylcellulose 1 Filling material Lychee puree 2 Apple juice 2 Vodka 1

[0163] Formulation 3

TABLE-US-00006 % Membrane mixture Water 75 Carrageenan 3.7 Locust bean gum 0.25 Xanthan gum 0.25 Gum arabic 1.2 Dextrose 0.10 Glycerine 14 Stearic acid 4 Lecithin 0.5 Methylcellulose 1 Filling material Pineapple juice 4 Cranberry puree 2 Vanilla flavouring 0.01

[0164] Formulation 4

TABLE-US-00007 % Membrane mixture Water 75 Carrageenan 3.7 Locust bean gum 0.25 Xanthan gum 0.25 Gum arabic 1.2 Glycerine 15 Lecithin 0.5% Carnauba wax 0.2% Filling material Strawberry puree 5 Basil syrup 0.5 Vodka 2

[0165] While the invention has been described in connection with specific embodiments thereof, it will be understood that it is capable of further modifications and this application is intended to cover any variations, uses or adaptations of the invention, including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains and as may be applied to the essential features hereinbefore set forth, and as follows in the scope of the appended claims.