WO2005016020A1

WO2005016020A1 - Chocolate compositions

Info

Publication number: WO2005016020A1
Application number: PCT/US2003/023359
Authority: WO
Inventors: John Van De Sype; Marc Heirman
Original assignee: Gargill, Incorporated
Priority date: 2003-07-24
Filing date: 2003-07-24
Publication date: 2005-02-24
Also published as: AU2003254183A1

Abstract

Chocolate compositions are disclosed that contain a specific lecithin products. The lecithin product is a membrane separated lecithin having a ratio of alkali metals to alkaline earth that ranges from greater than 0 to about 10.

Description

CHOCOLATE COMPOSITION

Cross Reference to Related Application This application is a continuation-in-part application of U.S. application serial number 10/202,294 that was filed with the United States Patent and Trademark Office on July 23, 2002. Field of the Invention The present invention relates to chocolate compositions containing specified lecithins. Background of the Invention Chocolate compositions used in foods in the United States is subject to a standard of identity established by the U.S. Food and Drug Administration under the Federal Food, Drug and Cosmetic Act. The U.S. definitions and standards for the various types of chocolate compositions are well established. As used herein, the term "chocolate composition" means chocolate, chocolate liquor, bittersweet chocolate, baking chocolate, milk chocolate, sweet chocolate, semisweet chocolate, buttermilk chocolate, skim milk chocolate, mixed dairy product chocolate, white chocolate, non-standardized chocolate, chocolate components, coatings thereof, and mixtures thereof. Non-standardized chocolates are those chocolates that use fat substitutes not from the cocoa bean such as, for example, cocoa butter equivalents, extenders and replacers. Such chocolate compositions all contain sugar, non-fat cocoa solids, cocoa butter, and viscosity regulators such as lecithin. Generally, chocolate used to coat or surround foods must be more fluid than chocolates used for plain chocolate solid bars or novelty shapes. The process of coating chocolate onto a food is known as enrobing. Enrobing is accomplished when the chocolate is in a fluid state and a proper viscosity must be maintained in order to produce a satisfactory coated product. Chocolate can also be molded. By molding, it is meant that chocolate, either plain or mixed with nuts, raising, crisped rice and the like, is deposited into moulds, allowed to cool and hardened into solid pieces and then removed from the mould. Chocolate molded with food inclusions generally must be as fluid as coating chocolates. As noted above, the rheological characteristics, i.e., the flow properties, of chocolate are very important. Chocolate flows differently depending upon how the chocolate is stirred or pumped or how quickly it is poured. These characteristics are described by two measurements: a yield value, which relates to how much force one must use to start the chocolate flowing; and a plastic viscosity, which approximates the work done to keep the chocolate flowing uniformly. If either the yield value or the plastic viscosity is not within certain prescribed limits, poor processing will result. Typically, a chocolate composition is produced by admixing a lipid source, lecithin, sugar, milk powder and chocolate liquor; refining the resulting mixture by passing it through rolls to achieve the desired particle size; followed by conching, which is defined as a mixing process, by means of a mixer commonly known as a conch, that results in making a flowable suspension out of the resulting mixture, developing the fully desirable chocolate flavor, reducing the water content volatility of acetic acids and low boiling aldehydes, and forming free amino acids; tempering which is defined as melting the chocolate so as to make it entirely amorphous (non-crystalline) followed by crystallizing process to obtain the maximum amount of the most stable crystalline structures. The above process is routinely utilized in the manufacture of chocolate and is well known to those skilled in the art of chocolate manufacturing. Further discussion on chocolate processing may be found in "Chocolate Cocoa & Confectionary; Science & technology by Bernard Minifie. published in 1970, and irk-Othmer Encyclopedia of Chemical Technology, 6:1-10 (3^τd Ed., iley- Interscience, New York) (1985) by B. L. Zoumas and E. J. Finnegan, which are herein incorporated by reference. Emulsifiers or surfactants such as lecithin are effective in improving the rheological properties of chocolate. Exemplary emulsifiers include lecithin derived from vegetable sources such as soybean, sunflowers, rapeseed, cottonseed, olive, ground nut, linola, linseed, palm, coconut, safflower, and corn; fractionated lecithins enriched in either phosphtidyl choline, phosphatidyl enthanolamine, phosphatidyl inositol or any combination; hydroxylated lecithin; mono- and di-glycerides; phosphated mono- and di-glycerides/diacetyl tartaric acid esters of mono- and di-glycerides (PMD/DATEM); monosodium phosphate derivatives of mono- and di-glycerides of edible fats or oils; sorbitan monostearate; polyoxyethylene sorbitan monostearate; polyglycerol esters of fatty acids; polyglycerol polyricinoleate (PGPR); propylene glycol mono and di-esters of fats and fatty acids; and the like. Summary of the Invention The present invention relates to chocolate compositions containing lecithins of a specific type. The lecithin products of the present invention are in a first embodiment described as membrane separated lecithins having a ratio of alkali metals to alkaline earth metals ranging from greater than 0 to about 10, preferably greater than 0 to about 5. In a second embodiment, the lecithin products of the present invention are described as lecithins having a ratio of alkali metals to alkaline earth metals ranging from about 1.6 to about 3.0, preferably 1.8 to 2.8. Detailed Description of the Invention The chocolate composition of the present invention can be produced by any known methods. Generally, a chocolate composition is produced by admixing a lipid source, lecithin, sugar, milk powder and chocolate liquor, refining the resulting mixture to achieve the desired particle size, conching, tempering, and molding. In the present chocolate composition, from about 0.05 wt.% to about 1.0 wt.% of a lecithin having an acetone soluble content of about 35 wt.% to about 40 wt.% and a ratio of greater than 0 to about 10 alkali metals to alkaline earth metals, is used. In particular, a membrane-separated lecithin having a ratio of 2.2 alkali metals to alkaline earth metals is used. The lecithin products of the present invention are in a first embodiment described as membrane separated lecithin having a ratio of alkali metals to alkaline earth metals ranging from greater than 0 to about 10, preferably from greater than 0 to about 5. In a second embodiment the lecithin products of the present invention are described as having a ratio of alkali metals to alkaline earth metals ranging from about 1.6 to about 3.0, preferably from about 1.8 to about 2.8. In determining the content of the alkali metals and alkaline earth metals of the lecithin product, the following test procedure is used: Elemental Analysis Standard Procedure SRC Elemental analysis was performed by Inductively Coupled Plasma-Emission Spectroscopy (ICP-ES) with target elements of aluminum, calcium, chromium, iron, lead, magnesium, ckel, potassium, phosphorus, silicon, sodium, and zinc. This analysis was performed according to the American Oil Chemists' Society (AOCS) Official Method Ca 20- 99. Each sample was weighed on an analytical balance to the nearest 0.0001 g. Because of the range of concentration, two dilution levels are required. Approximately 0.8 g of sample was weighted out and recorded. To the sample approximately 4.2 g of kerosene was weighted and recorded. The sample/kerosene mixture was vortexed until the sample is completely dissolved. Approximately 4.2 g mineral oil was added to the sample/kerosene solution and recorded. This concentration is used to analyze the lower level elements, Al, Cr, Fe, Pb, Na, Ni, Si, and Zn. For the higher concentration elements, Ca, Mg, P and K, another dilution is made by taking approximately 0.5 g of the first dilution, recording the weight, and adding approximately 9.5 g of a 50/50 kerosene/mineral oil and record the total weight. All of the final dilutions are mixed until homogeneous. The samples are placed into a heated, 40°C, sample hot plate along with the standards and allowed to come to temperature, approximately 10 minutes, prior to the introduction into the ICP. Samples were run in triplicate. Calculation: The ICP data is reported typically as pp calcium, magnesium, potassium, sodium and phosphorous, along with other metals. The ppm values are divided by the atomic weight of the respective element (Ca:40, K:39, P:31 and Mg:24) and the atomic equivalents are used to calculate the ratio of monovalent to divalent (alkali metals to alkaline-earth metals). The lecithin products of the present invention may be prepared by any suitable manner. For example, a vegetable oil miscella may be passed through a membrane, preferably polymeric or semi-permeable, to obtain a retentate and a permeate. The lecithin products are in the retentate. Exemplary of such methods are those appearing in U.S. Patent No. 6,207,209 to Jirjis, et al.; U.S. Patent Nos. 4,496, 498 and 4,533,501 to Sen Gupta. Specific examples describing the preparation of lecithin products of the invention are provided as follows: Example A Two samples of miscella were prepared by using the present technique. Miscella samples were obtained from two different oil seeds plants. A membrane was conditioned and used for removing phospholipids from each of the two samples of miscella. The membrane purchased was a PAN membrane from Osmonics, Inc. The membrane can be characterized as having an average pore size of 0.3 micron, and in the form of a spiral wound 25 inch x 40 inch membrane element. The membrane was conditioned by soaking the membrane in an intermediate solvent (propanol) for 24 hours. Then the membrane was soaked in mixture of intermediate solvent (propanol) and extraction solvent (hexane) for 24 hours. Finally, the membrane was soaked in extraction solvent (hexane) for 24 hours. The two samples of miscella were individually processed. For the soybean oil miscella, the test was conducted at retentate concentration of 1 Ox of the feed concentration and the permeate rate of lOx concentration was 100 liter/hour m². For the corn miscella, the test was conducted at retentate concentration of 7.4x of the feed at a permeate rate of 80 liter/hour m². Example B Samples of soybean oil miscella were taken on different days and were treated by using the present technique. Spiral wound 8 inch x 40 inch QX membranes were purchased from Osmonics, Inc. The membranes were conditioned and used for removing phospholipids by soaking them in an intermediate solvent (100% isopropanol) for 12 hours. At 6 hours, the intermediate solvent was recirculated at a flow rate of 15 m3/hr per element and forced through the membrane pores for about 15 minutes using a pump (this recirculation or forcing through is referred to as "forced permeation" for purposes of this Example B). Then the resulting membrane was soaked in a 50:50 mixture of intermediate solvent (100% isopropanol) and extraction solvent (100% commercial hexane) for 12 hours. After 6 hours this soaking included recirculation at a flow rate ofl5 m³/hour per element and forced permeation for about 15 minutes. Finally, the resulting membranes were soaked in extraction solvent (100% commercial hexane) for 12 hours, also with recirculation and forced permeation of the extraction solvent at 6 hours for about 15 minutes with 15m³/hour recirculation flow . The resulting membranes treated with this process are "conditioned membranes" for purposes of this Example B. The soybean miscella containing about 75 wt.% hexane, 24.3 wt.% crude oil, and 0.7 wt.% phospholipids, was passed through the first conditioned membrane at a trans-membrane pressure of 4 Kgf/cm² at a rate of 0.6 m³/hour per element. The resulting retentate stream had about 7 wt.% phospholipids and 23 wt.% oil (i.e., the test was conducted at retentate concentration of 10X of the feed concentration). Excess hexane was added to this retentate in the proportion of 2 portions of hexane to 1 portion of retentate resulting in a stream containing 88 wt% hexane. This retentate stream was passed through a second conditioned membrane at a trans-membrane pressure of 4 Kgf/cm² at a rate of 0.35 m³/hour per element, resulting in a retentate stream having about 65 wt% hexane, 23 wt.% phospholipids and 12 wt.% oil which is equivalent to lecithin free of hexane with 66% acetone insolubles. This retentate stream was desolventized at a rate of 1800 kg hour, 95°C and 260 mmHg absolute pressure. The resulting concentration of hexane was 5%. The retentate stream was further desolventized at a temperature of 110°C at an absolute pressure of 20 mm Hg and sparge steam of 80 kg/hour by using a stripper to produce 600 kg/hour of lecithin product with less than 5 ppm of hexane. The chocolate composition is supported by the following example. It should be understood that the example is not intended to limit the scope of the invention. Example In obtaining the data on the chocolate composition, the OICC (Office International du Cacao de du Chocolat) method was used to determine the rheology behavior, i.e., yield value and viscosity, of the chocolate composition of the present invention. A chocolate composition having good rheological characteristics means that the chocolate composition, either having full fat or reduced-fat content, has a Casson yield value and Casson viscosity such that the chocolate composition is suitable for processing in enrobing, extruding, or molding operations to form a finished chocolate composition. To be suitable for such processing operations, typical Casson yield values and Casson plastic viscosities for commercial coating chocolates of 0-200 dyn/cm² (1 dyne/cm² = 0.1 Pascal (Pa)) and 5-25 poise (10 poise = 1 Pa.s = 1000 mPa.s), respectively, and for commercial moulding chocolates of 100-2000 dyn/cm2 and 10-200 poise, respectively. Solid white chocolate (White 70, a coating chocolate, Fennema, Netherlands), consisting at least from about 40 wt.% to about 50 wt.% sugar, at least from about 35 wt.% to about 40 wt.% vegetable oil, at least from about 15 wt.% to about 20 wt.% non-fat milk solids, and at least from 0 wt.% to about 1 wt.% flavors, was heated in an acclimatization chamber at 50° C until thoroughly melted and the temperature of the melted white chocolate was held constant at 50° C. Narious amounts, specifically 0.0 wt.%, 0.11 wt.%, 0.22 wt. %, 0.28 wt.% and 0.41 wt.%, of membrane separated lecithin having 62 wt.% acetone insolubles and a ratio of 2.2 of alkali metals to alkaline earth metals were added to the melted white chocolate and mixed using a mixer (IKA Labortechniktn Eurostar Digital, Janke & Kunkel GmbH, Staufen, Germany) for 1 minute at 300 rpm. The resulting mixture was placed in a 40° C viscosimeter (ThermoHaake RN20) with a concentric cylinder configuration MNl, temperature was controlled at 40° C, and the yield value and viscosity were calculated by RheoWin Pro 2.92 software using the IOCCC method. The results are shown in Table 1. Table 1

The chocolate composition according to the present invention shows a reduced yield value and viscosity compared to the chocolate composition with no lecithin. The chocolate composition according to the present invention had a Casson yield value of 2.6 to 7.8 dyne/cm² and a Casson plastic viscosity of 5.5 to 8.13 poise. The chocolate composition will flow more easily and uniformly, and thus is suitable for processing in enrobing, extruding, or molding operations in order to form a finished chocolate composition. The flow properties of the chocolate composition of the present invention are improved by reducing the yield value and viscosity of the chocolate composition. The chocolate composition would flow more easily and uniformly, and thus suitable for processing in enrobing, extruding, or molding operations in order to form a finished chocolate composition. The invention has been described with reference to various specific and illustrative embodiments and techniques. However, one skilled in the art will recognize that many variations and modifications may be made while remaining within the spirit and scope of the invention.

Claims

WE CLAIM:

1. A chocolate composition comprising from about 0.05 wt.% to about 1.0 wt.% of a membrane separated lecithin having a ratio of alkali metals to alkaline earth ranging from greater than 0 to about 10.

2. The chocolate composition of claim 1 wherein the membrane separated lecithin has a ratio of alkali metals to alkaline earth metals ranges from greater than 0 to about 5.

3. A chocolate composition comprising from about 0.05 wt.% to about 1.0 wt.% of lecithin having a ratio of alkali metals to alkaline earth metals ranging from about 1.6 to about 3.0.

4. The chocolate composition of claim 3 wherein the lecithin has a ratio of alkali metals to alkaline earth metals ranging from about 1.8 to about 2.8.

5. The chocolate composition of claim 1 wherein the lecithin has a ration of alkali to alkaline earth metals of about 2.2.