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Gelatin or gelatine () is a translucent, colorless, flavorless food ingredient, commonly derived from collagen taken from animal body parts. It is brittle when dry and rubbery when moist. It may also be referred to as hydrolysis collagen, collagen hydrolysate, gelatine hydrolysate, hydrolyzed gelatine, and collagen after it has undergone hydrolysis. It is commonly used as a gelling agent in food, beverages, , drug or vitamin capsules, photographic films, papers, and cosmetics.
Substances containing gelatin or functioning in a similar way are called gelatinous substances. Gelatin is an irreversibly hydrolysis form of collagen, wherein the hydrolysis reduces protein fibrils into smaller ; depending on the physical and chemical methods of denaturation, the molecular weight of the peptides falls within a broad range. Gelatin is present in , most gummy candy and , , dips, and . Gelatin for cooking comes as powder, granules, and sheets. Instant types can be added to the food as they are; others must soak in water beforehand.
Gelatin is a natural polymer derived from collagen through hydrolysis. Its chemical structure is primarily composed of amino acids, including glycine, proline, and hydroxyproline. These amino acid chains form a three-dimensional network through hydrogen bonding and hydrophobic interactions, giving gelatin its gelling properties. Gelatin dissolves well in water and can form reversible gel-like substances. When cooled, water is trapped within its network structure, resulting in what is known as a hydrogel.
As a hydrogel, gelatin's uniqueness lies in its ability to maintain a stable structure and function even when it contains up to 90% water. This makes gelatin widely used in medical, food, and cosmetic industries, especially in drug delivery systems and wound dressings, as it provides stable hydration and promotes the healing process. Moreover, its biodegradability and biocompatibility make it an ideal hydrogel material. Research on hydrolyzed collagen shows no established benefit for joint health, though it is being explored for wound care. While safety concerns exist due to its animal origins, regulatory bodies have determined the risk of disease transmission to be very low when standard processing methods are followed.
Gelatin is nearly tasteless and odorless with a colorless or slightly yellow appearance.Budavari, S. (1996). Merck Index, (12th ed.) Whitehouse Station, NJ: Merck.Food and Nutrition Board, National Academy of Sciences. (1996). Food Chemicals Codex 4th Ed. Washington, DC: National Academy Press. It is transparent and brittle, and it can come as sheets, flakes, or as a powder. like hot water, glycerol, and acetic acid can dissolve gelatin, but it is insoluble in organic solvents like alcohol. Gelatin absorbs 5–10 times its weight in water to form a gel. The gel formed by gelatin can be melted by reheating, and it has an increasing viscosity under stress (Thixotropy). The upper melting point of gelatin is below human body temperature, a factor that is important for mouthfeel of foods produced with gelatin. (2025). 9780471192558, John Wiley & Sons. ISBN 9780471192558 The viscosity of the gelatin-water mixture is greatest when the gelatin concentration is high and the mixture is kept cool at about . Commercial gelatin will have a gel strength of around 90 to 300 grams Bloom using the Bloom test of gel strength.Igoe, R.S. (1983). Dictionary of Food Ingredients. New York: Van Nostrand Reinhold. Gelatin's strength (but not viscosity) declines if it is subjected to temperatures above , or if it is held at temperatures near 100 °C for an extended period of time. The Science of Gelatin – FineCooking
Gelatins have diverse melting points and gelation temperatures, depending on the source. For example, gelatin derived from fish has a lower melting and gelation point than gelatin derived from beef or pork.
Hydrolyzed collagen has been investigated as a type of wound dressing aimed at correcting imbalances in the wound microenvironment and the treatment of refractory wounds (chronic wounds that do not respond to normal treatment), as well as deep second-degree burn wounds.
In 1997, the U.S. Food and Drug Administration (FDA), with support from the TSE (transmissible spongiform encephalopathy) Advisory Committee, began monitoring the potential risk of transmitting animal diseases, especially bovine spongiform encephalopathy (BSE), commonly known as mad cow disease. An FDA study from that year stated: "... steps such as heat, alkaline treatment, and filtration could be effective in reducing the level of contaminating TSE agents; however, scientific evidence is insufficient at this time to demonstrate that these treatments would effectively remove the BSE infectious agent if present in the source material." On 18 March 2016, the FDA finalized three previously issued interim final rules designed to further reduce the potential risk of BSE in human food. The final rule clarified that "gelatin is not considered a prohibited cattle material if it is manufactured using the customary industry processes specified."
The Scientific Steering Committee (SSC) of the European Union in 2003 stated that the risk associated with bovine bone gelatin is very low or zero.
In 2006, the European Food Safety Authority stated that the SSC opinion was confirmed, that the BSE risk of bone-derived gelatin was small, and that it recommended removal of the 2003 request to exclude the skull, brain, and of bovine origin older than 12 months from the material used in gelatin manufacturing.
Gelatin also can be prepared at home. Boiling certain cartilaginous cuts of meat or bones results in gelatin being dissolved into the water. Depending on the concentration, the resulting stock (when cooled) will form a jelly or gel naturally. This process is used for aspic.
While many processes exist whereby collagen may be converted to gelatin, they all have several factors in common. The intermolecular and intramolecular bonds that stabilize insoluble collagen must be broken, and also, the hydrogen bonds that stabilize the collagen helix must be broken. The manufacturing processes of gelatin consists of several main stages:
Advances are occurring to optimize the yield of gelatin using enzymatic hydrolysis of collagen. The treatment time is shorter than that required for alkali treatment, and results in almost complete conversion to the pure product. The physical properties of the final gelatin product are considered better.
A recipe for jelled meat broth is found in Le Viandier, written in or around 1375.
In 15th century Britain, cattle hooves were boiled to produce a gel. By the late 17th century, the French inventor Denis Papin had discovered another method of gelatin extraction via boiling of bones. An English patent for gelatin production was granted in 1754. In 1812, the chemist further experimented with the use of hydrochloric acid to extract gelatin from bones, and later with steam extraction, which was much more efficient. The French government viewed gelatin as a potential source of cheap, accessible protein for the poor, particularly in Paris.
Food applications in France and the United States during the 19th century appear to have established the versatility of gelatin, including the origin of its popularity in the US as Jell-O. In the mid-19th century, the American industrialist and inventor, Peter Cooper, registered a patent for a gelatin dessert powder he called "Portable Gelatin", which only needed the addition of water. In the late 19th century, Charles and Rose Knox set up the Charles B. Knox Gelatin Company in New York, which promoted and popularized the use of gelatin.
Gelatin is used for the clarification of juices, such as apple juice, and of vinegar.Organic Materials Review Institute for the USDA National Organic Program. (2002). "Gelatin: Processing." National Organic Standards Board Technical Advisory Panel Review.
Isinglass is obtained from the swim bladders of fish. It is used as a fining agent for wine and beer. Besides hartshorn jelly, from deer antlers (hence the name "hartshorn"), isinglass was one of the oldest sources of gelatin.
Islamic halal and Jewish kosher customs generally require gelatin from sources other than pigs, such as cattle that have been slaughtered according to religious regulations (halal or kosher), or fish (that Jews and Muslims are allowed to consume).
On the other hand, some jurists have argued that the chemical treatment "purifies" the gelatin enough to always be halal, an argument most common in the field of medicine.
It has similarly been argued that gelatin in medicine is permissible in Judaism, as it is not used as food. According to The Dietary Laws, the book of kosher guidelines published by the Rabbinical Assembly, the organization of Conservative Jewish rabbis, all gelatin is kosher and pareve because the chemical transformation undergone in the manufacturing process renders it a different physical and chemical substance.
Buddhist, Hindu, and Jainism customs may require gelatin alternatives from sources other than animals, as many Hindus, almost all Jains and some Buddhists are vegetarian.
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Cosmetics
In cosmetics, hydrolyzed collagen may be found in topical creams, acting as a product texture conditioner, and moisturizer. Collagen implants or dermal fillers are also used to address the appearance of wrinkles, contour deficiencies, and acne scars, among others. The U.S. Food and Drug Administration has approved its use, and identifies cow (bovine) and human cells as the sources of these fillers. According to the FDA, the desired effects can last for 3–4 months, which is relatively the most short-lived compared to other materials used for the same purpose.
Medicine
Other technical uses
Gelatin derivatives
Gelatin methacryloyl (GelMA) is a chemically modified derivative of gelatin, produced by introducing methacryloyl functional groups onto gelatin's amine and hydroxyl residues. This modification allows GelMA to undergo photocrosslinking in the presence of a photoinitiator, forming stable hydrogels with tunable mechanical properties. Additionally, the introduction of methacrylated groups enhances GelMA's mucoadhesive properties, making it particularly useful for mucosal drug delivery applications. Due to its biocompatibility, biodegradability, and ability to mimic the extracellular matrix, GelMA has gained widespread applications in tissue engineering, drug delivery, and biofabrication. It is particularly useful in 3D bioprinting, wound healing, and the development of organ-on-a-chip models. Its capacity to support cell adhesion, proliferation, and differentiation further makes it an attractive biomaterial for regenerative medicine and biomedical research.
Religious considerations
The consumption of gelatin from particular animals may be forbidden by religious rules or cultural taboos.
See also
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