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Caramel color

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Caramel color or caramel coloring is a water-soluble food coloring. It is made by heat treatment of carbohydrates, in general in the presence of acids, alkalis, or salts, in a process called caramelization. It is more fully oxidized than caramel candy, and has an odor of burnt sugar and a somewhat bitter taste. Its color ranges from pale yellow to amber to dark brown.

Contents

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Caramel color is one of the oldest and most widely used food colorings, and is found in many commercially produced foods and beverages, including batters, beer, brown bread, buns, chocolate, cookies, cough drops, spirits and liquor such as brandy, rum, and whisky, chocolate-flavored confectionery and coatings, custards, decorations, fillings and toppings, potato chips, dessert mixes, doughnuts, fish and shellfish spreads, frozen desserts, fruit preserves, glucose tablets, gravy, ice cream, pickles, sauces and dressings, soft drinks (especially colas), sweets, vinegar, and more. Caramel color is widely approved for use in food globally but application and use level restrictions vary by country.

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Caramel color in cola


Production

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Caramel color is manufactured by heating carbohydrates, either alone or in the presence of acids, alkalis, and/or salts. Caramel color is produced from commercially available nutritive sweeteners consisting of fructose, dextrose (glucose), invert sugar, sucrose, malt syrup, molasses, starch hydrolysates and fractions thereof. The acids that may be used are sulfuric, sulfurous, phosphoric, acetic, and citric acids; the alkalis are ammonium, sodium, potassium, and calcium hydroxides; and the salts are ammonium, sodium, and potassium carbonate, bicarbonate, phosphate (including mono- and dibasic), sulfate, and bisulfite. Antifoaming agents, such as polyglycerol esters of fatty acids, may be used as processing aids during manufacture. Its color ranges from pale-yellow to amber to dark-brown.

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Caramel color molecules carry either a positive or a negative charge depending upon the reactants used in their manufacture. Problems such as precipitation, flocculation, or migration can be eliminated with the use of a properly charged caramel color for the intended application.

Classification

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Internationally, the United Nations Joint Food and Agriculture Organization/World Health Organization Expert Committee on Food Additives (JECFA) recognizes four classes of caramel color, differing by the reactants used in their manufacture, each with its own INS and E number, listed in the table below.

Color

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Color Intensity (Tinctorial Power) is defined as the absorbance of a 1 mg/mL (0.1%) solution (weight/volume) in water, measured using a 1 cm light path at a wavelength of 610 nanometers (or 560 nm for tinctorial power). In this case, A stands for absorbance and TS stands for total solids.

Color Intensity = A 100 T S

The color tone of the caramel color is also important. This is defined by the Linner Hue Index, which is the measure of the color hue or red characteristics of the caramel color. It is a function of the absorbance of light of wavelengths 510 and 610 nm. In general, the higher the Tinctorial Power, K0.56, the lower the Hue Index and the lower the red tones.

Various other indices are in use around the world and there are conversion factors between them.

Additional function

Caramel color is a colloid. Though the primary function of caramel color is for coloration, it also serves additional functions. In soft drinks, it can function as an emulsifier to help inhibit the formation of certain types of "floc" and its light protective quality can aid in preventing oxidation of the flavoring components in bottled beverages.

Toxicology

Internationally, JECFA has set the Acceptable Daily Intake (ADI) of Class I caramel color as "not specified"; that of Class II as 0–160 mg/kg body weight; that of Class III as 0–200 mg/kg body weight; and that of Class IV as 0–200 mg/kg body weight.

The United States Food and Drug Administration (FDA) classifies and regulates caramel color in Title 21 CFR § 73.85 as a generally recognized as safe (GRAS) color additive exempt from certification. Unless a food has a standard of identity, caramel color may be safely used in foods generally at levels consistent with "good manufacturing practice" (GMP).

In 2010, the International Programme on Chemical Safety (IPCS) concluded that commercially produced caramel color has the same toxicological properties as caramel produced by cooking or heating sucrose, except for those prepared using ammonium (Class III and IV). The IPCS has concluded that caramel color does not exhibit carcinogenicity or mutagenicity, based on its studies. While the US FDA, Canadian Health Products and Food Branch and European Food Safety Authority (EFSA) have found caramel color safe for use in food and beverages, California has listed a compound formed in the manufacture of Class III and IV caramel colors in the state's Proposition 65, thus legally including it in the category of chemicals "known to the state to cause cancer or reproductive toxicity".

According to the Food Chemicals Codex, 4-Methylimidazole in caramel color is allowed up to 250 ppm on a color-adjusted basis, which means 250 ppm maximum for every 0.100 color absorbance of a 0.10% solution at 610 nm.

Caramel color has excellent microbiological stability. Since it is manufactured under very high temperature, high acidity, high pressure, and high specific gravity, it is essentially sterile, as it will not support microbial growth unless in a dilute solution.

When reacted with sulfites, caramel color may retain traces of sulfite after processing. However, in finished food products, labeling is usually required only for sulfite levels above 10 ppm.

Food allergies

Caramel coloring may be derived from a variety of source products that are themselves common allergens, starch hydrolysates (from wheat), malt syrup (in general derived from barley), or lactose (from milk). As such, persons with known sensitivities or allergies to food products are advised to avoid foods including generic caramel coloring or first determine the source for the caramel coloring before consuming the food. North American and European manufacturers mostly use glucose derived from corn or wheat to produce caramel color, which is highly processed and is generally considered gluten-free.

References

Caramel color Wikipedia


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