Gelatin

Gelatin or gelatine (from Latin: gelatus meaning "stiff" or "frozen") is a translucent, colorless, flavorless food ingredient, derived from collagen taken from animal body parts. It is brittle when dry and gummy when moist. It may also be referred to as hydrolyzed collagen, collagen hydrolysate, gelatine hydrolysate, hydrolyzed gelatine, and collagen peptides after it has undergone hydrolysis. It is commonly used as a gelling agent in food, medications, drug and vitamin capsules, photographic films and papers, and cosmetics.

For the dessert food, see Gelatin dessert. For the gel based on starch, see Starch gelatinization. For other uses, see Gelatin (disambiguation).

Sheet (or leaf) gelatin for cooking

Substances containing gelatin or functioning in a similar way are called gelatinous substances. Gelatin is an irreversibly hydrolyzed form of collagen, wherein the hydrolysis reduces protein fibrils into smaller peptides; depending on the physical and chemical methods of denaturation, the molecular weight of the peptides falls within a broad range. Gelatin is in gelatin desserts; most gummy candy and marshmallows; and ice creams, dips, and yogurts.[1] 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.

Characteristics

Properties

Gelatin is a mixture of peptides and proteins produced by partial hydrolysis of collagen extracted from the skin, bones, and connective tissues of animals such as domesticated cattle, chicken, pigs, and fish. During hydrolysis, the natural molecular bonds between individual collagen strands are broken down into a form that rearranges more easily. Its chemical composition is, in many aspects, closely similar to that of its parent collagen.[2] Photographic and pharmaceutical grades of gelatin generally are sourced from cattle bones and pig skin.

Amino acid composition

Gelatin is nearly tasteless and odorless with a colorless or slightly yellow appearance.[3][4] It is transparent and brittle, and it can come as sheets, flakes, or as a powder.[3] Polar solvents like hot water, glycerol, and acetic acid can dissolve gelatin, but it is insoluble in organic solvents like alcohol.[3] Gelatin absorbs 5-10 times its weight in water to form a gel.[3] The gel formed by gelatin can be melted by reheating, and it has an increasing viscosity under stress (thixotropic).[3] The upper melting point of gelatin is below human body temperature, a factor that is important for mouthfeel of foods produced with gelatin.[5] The viscosity of the gelatin-water mixture is greatest when the gelatin concentration is high and the mixture is kept cool at about 4 °C (39 °F). Commercial gelatin will have a gel strength of around 90 to 300 grams Bloom using the Bloom test of gel strength.[6] Gelatin's strength (but not viscosity) declines if it is subjected to temperatures above 100 °C (212 °F), or if it is held at temperatures near 100 °C for an extended period of time.[7][8]

Depending on the origin of the gelatin, it can have different melting points and gelation temperatures. For example, gelatin derived from fish has a lower melting and gelation point than gelatin derived from beef or pork.[9]

Composition

When dry, gelatin consists of 98-99% protein, but it is not a nutritionally complete protein since it is missing tryptophan and is deficient in isoleucine, threonine, and methionine.[10] The amino acid content of hydrolyzed collagen is the same as collagen. Hydrolyzed collagen contains 19 amino acids, predominantly glycine (Gly) 26-34%, proline (Pro) 10-18%, and hydroxyproline (Hyp) 7-15%, which together represent around 50% of the total amino acid content.[11] Glycine is responsible for close packing of the chains. Presence of proline restricts the conformation. This is important for gelation properties of gelatin.[12] Other amino acids that contribute highly include: alanine (Ala) 8-11%; arginine (Arg) 8-9%; aspartic acid (Asp) 6-7%; and glutamic acid (Glu) 10-12%.[11]

Research

Digestibility

The bioavailability of hydrolyzed collagen in mice was demonstrated in a 1999 study; orally administered 14C hydrolyzed collagen was digested and more than 90% absorbed within 6 hours, with measurable accumulation in cartilage and skin.[13] A 2005 study in humans found hydrolyzed collagen absorbed as small peptides in the blood.[14]

Effects on skin

Ingestion of hydrolyzed collagen may affect the skin by increasing the density of collagen fibrils and fibroblasts, thereby stimulating collagen production.[15] It has been suggested, based on mouse and in vitro studies, that hydrolyzed collagen peptides have chemotactic properties on fibroblasts[16] or an influence on growth of fibroblasts.[17]

Joint and bone effects

Some clinical studies report that the oral ingestion of hydrolyzed collagen decreases joint pain, those with the most severe symptoms showing the most benefit.[18][19] Beneficial action is likely due to hydrolyzed collagen accumulation in the cartilage[13] and stimulated production of collagen by the chondrocytes, the cells of cartilage.[20] Several studies have shown that a daily intake of hydrolyzed collagen increases bone mass density in rats.[21][22] It seems that hydrolyzed collagen peptides stimulated differentiation and osteoblasts activity – the cells that build bone – over that of osteoclasts (cells that destroy bone).

However, other clinical trials have yielded mixed results. In 2011, the European Food Safety Authority Panel on Dietetic Products, Nutrition and Allergies concluded that "a cause and effect relationship has not been established between the consumption of collagen hydrolysate and maintenance of joints".[23] Four other studies reported benefit with no side effects; however, the studies were not extensive, and all recommended further controlled study.[24][25][26][27] One study found that oral collagen only improved symptoms in a minority of patients and reported nausea as a side effect.[28] Another study reported no improvement in disease activity in patients with rheumatoid arthritis.[29] Another study found that collagen treatment may actually cause an exacerbation of rheumatoid arthritis symptoms.[30][31][32]

Safety concerns

Hydrolyzed collagen, like gelatin, is made from animal by-products from the meat industry or sometimes animal carcasses removed and cleared by knackers, including skin, bones, and connective tissue.

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.[33] 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."[34] 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.[35] The final rule clarified that "gelatin is not considered a prohibited cattle material if it is manufactured using the customary industry processes specified."[36]

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.[37][38]

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 vertebrae of bovine origin older than 12 months from the material used in gelatin manufacturing.[39]

Production
Gelatin production by geographical region

The worldwide production amount of gelatin is about 375,000–400,000 tonnes per year (830×10^6–880×10^6 lb/a).[40] On a commercial scale, gelatin is made from by-products of the meat and leather industries. Most gelatin is derived from pork skins, pork and cattle bones, or split cattle hides.[41] Gelatin made from fish by-products avoids some of the religious objections to gelatin consumption.[42] The raw materials are prepared by different curing, acid, and alkali processes that are employed to extract the dried collagen hydrolysate. These processes may take several weeks, and differences in such processes have great effects on the properties of the final gelatin products.

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.[43] The manufacturing processes of gelatin consists of several main stages:

  1. Pretreatments to make the raw materials ready for the main extraction step and to remove impurities that may have negative effects on physicochemical properties of the final gelatin product.
  2. Hydrolysis of collagen into gelatin.
  3. Extraction of gelatin from the hydrolysis mixture, which usually is done with hot water or dilute acid solutions as a multistage process.
  4. The refining and recovering treatments including filtration, clarification, evaporation, sterilization, drying, rutting, grinding, and sifting to remove the water from the gelatin solution, to blend the gelatin extracted, and to obtain dried, blended, ground final product.

Pretreatments

If the raw material used in the production of the gelatin is derived from bones, dilute acid solutions are used to remove calcium and other salts. Hot water or several solvents may be used to reduce the fat content, which should not exceed 1% before the main extraction step. If the raw material consists of hides and skin; size reduction, washing, removal of hair from hides, and degreasing are necessary to prepare the hides and skins for the hydrolysis step.

Hydrolysis

After preparation of the raw material, i.e., removing some of the impurities such as fat and salts, partially purified collagen is converted into gelatin through hydrolysis. Collagen hydrolysis is performed by one of three different methods: acid-, alkali-, and enzymatic hydrolysis. Acid treatment is especially suitable for less fully cross-linked materials such as pig skin collagen and normally requires 10 to 48 hours. Alkali treatment is suitable for more complex collagen such as that found in bovine hides and requires more time, normally several weeks. The purpose of the alkali treatment is to destroy certain chemical crosslinks still present in collagen. Within the gelatin industry, the gelatin obtained from acid-treated raw material has been called type-A gelatin and the gelatin obtained from alkali-treated raw material is referred to as type-B gelatin.[44]

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.[45]

Extraction

Extraction is performed with either water or acid solutions at appropriate temperatures. All industrial processes are based on neutral or acid pH values because although alkali treatments speed up conversion, they also promote degradation processes. Acidic extraction conditions are extensively used in the industry, but the degree of acid varies with different processes. This extraction step is a multistage process, and the extraction temperature usually is increased in later extraction steps, which ensures minimum thermal degradation of the extracted gelatin.

Recovery

This process includes several steps such as filtration, evaporation, drying, grinding, and sifting. These operations are concentration-dependent and also dependent on the particular gelatin used. Gelatin degradation should be avoided and minimized, so the lowest temperature possible is used for the recovery process. Most recoveries are rapid, with all of the processes being done in several stages to avoid extensive deterioration of the peptide structure. A deteriorated peptide structure would result in a low gel strength, which is not generally desired.

Uses

Early history of food applications

The first use of gelatin in foods is documented in the 15th century in medieval Britain, where cattle hooves were boiled for extended periods of time to produce a gel. This process was laborious and time-consuming, confined mainly to wealthier households.[46] The first recorded English patent for gelatin production was granted in 1754.[46] By the late 17th century, French inventor Denis Papin had discovered another method of gelatin extraction via boiling of bones.[47] In 1812, the chemist Jean-Pierre-Joseph d'Arcet(fr) 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.[48] Food applications in France and the United States during 19th century appear to have established the versatility of gelatin, including the origin of its popularity in the US as Jell-O.[49] From the mid 1800s, Charles and Rose Knox of New York manufactured and marketed gelatin powder, diversifying the appeal and applications of gelatin.[50]

Culinary uses
Eggs in aspic

Probably best known as a gelling agent in cooking, different types and grades of gelatin are used in a wide range of food and nonfood products. Common examples of foods that contain gelatin are gelatin desserts, trifles, aspic, marshmallows, candy corn, and confections such as Peeps, gummy bears, fruit snacks, and jelly babies.[51] Gelatin may be used as a stabilizer, thickener, or texturizer in foods such as yogurt, cream cheese, and margarine; it is used, as well, in fat-reduced foods to simulate the mouthfeel of fat and to create volume. It also is used in the production of several types of Chinese soup dumplings, specifically Shanghainese soup dumplings, or xiaolongbao, as well as Shengjian mantou, a type of fried and steamed dumpling. The fillings of both are made by combining ground pork with gelatin cubes, and in the process of cooking, the gelatin melts, creating a soupy interior with a characteristic gelatinous stickiness.

Gelatin is used for the clarification of juices, such as apple juice, and of vinegar.[52]

Isinglass is obtained from the swim bladders of fish. It is used as a fining agent for wine and beer.[53] Besides hartshorn jelly, from deer antlers (hence the name "hartshorn"), isinglass was one of the oldest sources of gelatin.

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.[54]

Other technical uses
Capsules made of gelatin
  • Certain professional and theatrical lighting equipment use color gels to change the beam color. Historically, these were made with gelatin, hence the term, color gel.
  • Gelatin typically constitutes the shells of drug and vitamin capsules to make them easier to swallow. Hypromellose is a vegetarian-acceptable alternative to gelatin, but is more expensive to produce.
  • Some animal glues such as hide glue may be unrefined gelatin.
  • It is used to hold silver halide crystals in an emulsion in virtually all photographic films and photographic papers. Despite significant effort, no suitable substitutes with the stability and low cost of gelatin have been found.
  • Used as a carrier, coating, or separating agent for other substances, for example, it makes β-carotene water-soluble, thus imparting a yellow color to any soft drinks containing β-carotene.
  • Ballistic gelatin is used to test and measure the performance of bullets shot from firearms.
  • Gelatin is used as a binder in match heads[55] and sandpaper.[56]
  • Cosmetics may contain a non-gelling variant of gelatin under the name hydrolyzed collagen (hydrolysate).
  • Gelatin was first used as an external surface sizing for paper in 1337 and continued as a dominant sizing agent of all European papers through the mid-nineteenth century.[57] In modern times, it is mostly found in watercolor paper, and occasionally in glossy printing papers, artistic papers, and playing cards. It maintains the wrinkles in crêpe paper.
  • Gelatin is also used in synthesizing hydrogels for tissue engineering applications.[58]

Dietary restrictions and gelatin substitutes

The consumption of gelatin from particular animals may be forbidden by religious rules or cultural taboos. For example, Islamic halal and Jewish kosher customs require gelatin from sources other than pigs, such as cattle (that have been slaughtered according to the religious regulations) or fish (that they are allowed to consume). Roma people are cautious of gelatin products that may have been made from horses, as their culture forbids the consumption of horses. Some companies specify the source of the gelatin used.

Vegans and vegetarians do not eat foods containing gelatin made from animals. Likewise, Sikh, Hindu, and Jain customs may require gelatin alternatives from sources other than animals, as many Hindus, most Jains and some Sikhs are vegetarian. Partial alternatives to gelatins derived from animals include the seaweed extracts agar and carrageenan, and the plant extracts pectin and konjac.

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See also
  • Collagen Hybridizing Peptide, a peptide that can bind and stain denatured collagen in tissues
  • Jell-O, colored and sometimes flavored gelatin used as a dessert

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