Caramelization is a process of browning of sugar used extensively in cooking for the resulting butter-like flavor and brown color. The brown colors are produced by three groups of polymers: caramelans (C24H36O18), caramelens (C36H50O25), and caramelins (C125H188O80). As the process occurs, volatile chemicals such as diacetyl (known for its intense butter-like taste) are released, producing the characteristic caramel flavor. [1]
Like the Maillard reaction, caramelization is a type of non-enzymatic browning. Unlike the Maillard reaction, caramelization is pyrolytic, as opposed to being a reaction with amino acids.
When caramelization involves the disaccharide sucrose, it is broken down into the monosaccharides fructose and glucose. [2]
Caramelization is a complex, poorly understood process that produces hundreds of chemical products, and includes the following types of reactions:
The process is temperature-dependent. Specific sugars each have their own point at which the reactions begin to proceed readily. Impurities in the sugar, such as the molasses remaining in brown sugar, greatly speed the reactions.
Sugar | Temperature |
---|---|
Fructose | 105 °C (221 °F) |
Galactose | 160 °C (320 °F) |
Glucose | 150 °C (302 °F) |
Sucrose | 170 °C (338 °F) |
Maltose | 180 °C (360 °F) |
Caramelization reactions are also sensitive to the chemical environment, [4] and the reaction rate, or temperature at which reactions occur most readily, can be altered by controlling the level of acidity (pH). The rate of caramelization is generally lowest at near-neutral acidity (pH around 7), and accelerated under both acidic (especially pH below 3) and basic (especially pH above 9) conditions. [5]
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Caramelization is used to produce several foods, including:
Fructose, or fruit sugar, is a ketonic simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galactose, that are absorbed by the gut directly into the blood of the portal vein during digestion. The liver then converts most fructose and galactose into glucose for distribution in the bloodstream or deposition into glycogen.
Molasses is a viscous byproduct, principally obtained from the refining of sugarcane or sugar beet juice into sugar. Molasses varies in the amount of sugar, the method of extraction and age of the plant. Sugarcane molasses is usually used to sweeten and flavour foods. Molasses is a major constituent of fine commercial brown sugar.
Caramel is a confectionery product made by heating a range of sugars. It is used as a flavoring in puddings and desserts, as a filling in bonbons or candy bars, or as a topping for ice cream and custard.
The Maillard reaction is a chemical reaction between amino acids and reducing sugars to create melanoidins, the compounds that give browned food its distinctive flavor. Seared steaks, fried dumplings, cookies and other kinds of biscuits, breads, toasted marshmallows, falafel and many other foods undergo this reaction. It is named after French chemist Louis Camille Maillard, who first described it in 1912 while attempting to reproduce biological protein synthesis. The reaction is a form of non-enzymatic browning which typically proceeds rapidly from around 140 to 165 °C. Many recipes call for an oven temperature high enough to ensure that a Maillard reaction occurs. At higher temperatures, caramelization and subsequently pyrolysis become more pronounced.
Crème caramel, flan, caramel pudding, condensed milk pudding or caramel custard is a custard dessert with a layer of clear caramel sauce.
Inverted sugar syrup, also called invert syrup, invert sugar, simple syrup, sugar syrup, sugar water, bar syrup, syrup USP, or sucrose inversion, is a syrup mixture of the monosaccharides glucose and fructose, that is made by hydrolytic saccharification of the disaccharide sucrose. This mixture's optical rotation is opposite to that of the original sugar, which is why it is called an invert sugar.
Fudge is a type of dessert bar that is made by mixing sugar, butter and milk. It has its origins in the 19th century United States, and was popular in the women's colleges of the time. Fudge can come in a variety of flavorings depending on the region or country it was made; popular flavors include fruit, nut, chocolate and caramel. Fudge is often bought as a gift from a gift shop in tourist areas and attractions.
Dulce de leche, caramelized milk, milk candy, or milk jam is a confectionery popular in Latin America, France, Poland, and the Philippines prepared by slowly heating sugar and milk over several hours. The substance takes on a spreadable, sauce-like consistency and derives its rich flavour and colour from non-enzymatic browning. It is typically used to top or fill other sweet foods.
A reducing sugar is any sugar that is capable of acting as a reducing agent. In an alkaline solution, a reducing sugar forms some aldehyde or ketone, which allows it to act as a reducing agent, for example in Benedict's reagent. In such a reaction, the sugar becomes a carboxylic acid.
Browning is the process of food turning brown due to the chemical reactions that take place within. The process of browning is one of the chemical reactions that take place in food chemistry and represents an interesting research topic regarding health, nutrition, and food technology. Though there are many different ways food chemically changes over time, browning in particular falls into two main categories: enzymatic versus non-enzymatic browning processes.
Apple butter is a highly concentrated form of apple sauce produced by long, slow cooking of apples with apple juice or water to a point where the sugar in the apples caramelizes, turning the apple butter a deep brown. The concentration of sugar gives apple butter a much longer shelf life as a preserve than apple sauce.
Slovak cuisine varies slightly from region to region across Slovakia. It was influenced by the traditional cuisine of its neighbours and it influenced them as well. The origins of traditional Slovak cuisine can be traced to times when the majority of the population lived self-sufficiently in villages, with very limited food imports and exports and with no modern means of food preservation or processing.
The following outline is provided as an overview of and topical guide to the preparation of food:
Caramel color or caramel coloring is a water-soluble food coloring. It is made by heat treatment of carbohydrates (sugars), 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.
Dominican cuisine is made up of Spanish, Indigenous Taíno, Middle Eastern, and African influences. The most recent influences in Dominican cuisine are from the British West Indies and China.
Coconut sugar is a palm sugar produced from the sap of the flower bud stem of the coconut palm.
Belizean cuisine is an amalgamation of all ethnicities in the nation of Belize and their respectively wide variety of foods. Breakfast often consists of sides of bread, flour tortillas, or fry jacks that are often homemade and eaten with various cheeses. All are often accompanied with refried beans, cheeses, and various forms of eggs, etc. Inclusive is also cereal along with milk, coffee, or tea.