This is a working overview of triple helix, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-17 and is reviewed periodically as new material appears.
Collagen is a structural protein found in connective tissues of animals, and collagen peptides are short amino acid chains produced by hydrolyzing native collagen into smaller fragments. The hydrolysis process typically uses enzymes or acids under controlled conditions. Commercial collagen peptides often come from bovine hide, porcine skin, or fish scales. The resulting material is water-soluble and differs from intact collagen in molecular size and behavior. The term 'collagen peptide' generally refers to a mixture of peptide chains rather than a single defined molecule.
Production begins with cleaning and mincing raw collagen-rich tissues. The material undergoes pretreatment to remove non-collagenous components, followed by hydrolysis using enzymes such as pepsin or alcalase, or by acid or alkaline treatment. Reaction time, temperature, and pH influence the average molecular weight of the resulting peptides. After hydrolysis, the mixture is filtered, concentrated, and dried, often by spray drying. The final product is a powder with a characteristic amino acid profile rich in glycine, proline, and hydroxyproline.
Collagen peptides are distinguished from gelatin by their lower average molecular weight and better solubility in cold water. Gelatin forms gels upon cooling, while collagen peptides typically do not. Molecular weight distributions for commercial collagen peptides often range from about 2 to 20 kilodaltons, though exact profiles vary by manufacturer and process. Products may be sold as powders, capsules, or liquids. The term "collagen hydrolysate" is frequently used as a synonym, although labeling conventions differ across regions.
Hydrolysis converts native collagen into shorter peptides and improves water solubility. Enzymatic treatment with proteases such as pepsin or alkaline proteases is common, though acid or thermal hydrolysis can also be used. The resulting molecular weight distribution typically ranges from about 2 to 10 kilodaltons. Gelatin is a related product formed by partial hydrolysis, but it retains the ability to gel in water. Collagen peptides undergo further breakdown and generally do not form gels.
Commercial collagen peptides come from bovine hide, porcine skin, fish scales, and fish skin. Each source yields a distinct amino acid profile, including different levels of hydroxyproline and glycine. Marine sources often have lower hydroxyproline content than mammalian sources. Production involves extraction, hydrolysis, filtration, and drying, usually spray drying. The final powder is typically white to off-white and dissolves readily in water. Exact composition and peptide size depend on the raw material and the hydrolysis conditions.
Collagen is a structural protein found in skin, bone, tendon, and cartilage, where it forms a triple helix of three polypeptide chains. The chains contain repeating Gly-X-Y sequences, with proline and hydroxyproline frequently occupying the X and Y positions. Collagen peptides are fragments produced by breaking these long chains through hydrolysis. These fragments vary in length and amino acid composition depending on the source and processing method, so the term covers a range of products rather than a single defined molecule.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Typical for spray-dried commercial grades. |
| Solubility | Soluble in water | Cold water solubility distinguishes from gelatin. |
| Typical molecular weight | 2–20 kDa | Range varies by hydrolysis conditions and source. |
| Common synonyms | Hydrolyzed collagen, collagen hydrolysate | Labeling varies by region and manufacturer. |
| Typical storage | Cool, dry conditions | Protect from moisture and heat to maintain stability. |
Collagen peptides differ from gelatin in degree of hydrolysis and chain length. Gelatin forms gels when cooled, whereas extensively hydrolyzed collagen peptides generally remain soluble over a wider temperature range; this difference arises because shorter peptides lose the ordered structure needed for gel network formation. Products may be standardized by molecular weight, amino acid content, or solubility, but no single specification applies to all collagen peptides. Source material, hydrolysis method, and filtration steps all contribute to batch-to-batch variation. These variables make it difficult to compare studies that use different preparations.
Collagen peptides are short chains of amino acids produced by hydrolyzing collagen from animal tissues. The raw material commonly comes from bovine hide, porcine skin, fish skin, or poultry cartilage. Hydrolysis breaks native collagen's triple helix into smaller fragments and increases water solubility relative to intact collagen. The resulting mixture contains peptides of varying lengths rather than a single molecular species; commercial samples are often described by average molecular weight or by a size range. This broad composition affects functional properties such as gelation, foaming, and mouthfeel.
Enzymatic, alkaline, or acid treatments can cleave collagen into peptides. Enzymatic hydrolysis with proteases is common because it allows control over temperature, pH, and reaction time, while the choice of enzyme and raw material influences the peptide profile and amino acid composition. Glycine, proline, and hydroxyproline are abundant in collagen peptides, whereas tryptophan is typically low or absent. Hydroxyproline serves as a characteristic marker for collagen-derived material. Processing conditions also affect color, odor, and taste, which matter for food and supplement applications.
Collagen peptides are hygroscopic and can cake or lose flowability when exposed to moisture. Typical storage is in sealed containers at ambient temperature, away from direct sunlight and strong odors. High humidity and prolonged heat may increase Maillard browning, off-odors, or microbial risk. Food-grade specifications commonly set limits for moisture, ash, heavy metals, and total plate count. Stability studies often monitor appearance, moisture, molecular mass profile, and microbial counts over defined intervals.
Identity and purity testing for collagen peptides combines general protein assays with methods sensitive to collagen-specific features. Hydroxyproline content is often measured colorimetrically after acid hydrolysis and serves as a marker of collagen origin. Total nitrogen or Kjeldahl analysis estimates protein content but does not distinguish peptides from other nitrogenous compounds. Amino acid analysis provides a compositional fingerprint, while SDS-PAGE and size-exclusion chromatography reveal molecular weight ranges. No single method captures all quality attributes, so specifications typically combine several orthogonal tests.
In late 2009, the JINR–LLNL collaboration studied the 249Bk + 48Ca reaction in an effort to produce element 117, which would decay to elements 115 and 113 and bolster their claims in a cross-reaction. They were now joined by scientists from Oak Ridge National Laboratory (ORNL) and Vanderbilt University, both in Tennessee, United States, who helped procure the rare and highly radioactive berkelium target necessary to complete the JINR's calcium-48 campaign to synthesise the heaviest elements on the periodic table. Two isotopes of element 117 were synthesised, decaying to element 115 and then element 113:
The submucosa (tela submucosa), or submucosal layer, is a thin layer of tissue in various organs of the gastrointestinal, respiratory, and genitourinary tracts. It is the layer of dense irregular connective tissue that supports the mucosa (mucous membrane) and joins it to the muscular layer, the bulk of overlying smooth muscle (fibers running circularly within layer of longitudinal muscle). The submucosa (sub- + mucosa) is to a mucous membrane what the subserosa (sub- + serosa) is to a serous membrane.
The muscle cell is damaged by the depletion of ATP and possibly the high temperatures, and cellular constituents "leak" into the circulation, including potassium, myoglobin, creatine, phosphate and creatine kinase. The other known causative gene for MH is CACNA1S, which encodes an L-type voltage-gated calcium channel α-subunit. There are two known mutations in this protein, both affecting the same residue, R1086. This residue is located in the large intracellular loop connecting domains 3 and 4, a domain possibly involved in negatively regulating RYR1 activity. When these mutant channels are expressed in human embryonic kidney (HEK 293) cells, the resulting channels are five times more sensitive to activation by caffeine (and presumably halothane) and activate at 5–10mV more hyperpolarized. Furthermore, cells expressing these channels have an increased basal cytosolic Ca2+ concentration. As these channels interact with and activate RYR1, these alterations result in a drastic increase of intracellular Ca2+, and, thereby, muscle excitability. Other mutations causing MH have been identified, although in most cases the relevant gene remains to be identified.
== See also == Upper Voltan Territorial Assembly election, 1957 List of French possessions and colonies French colonial empire French West Africa Heads of state of Burkina Faso Heads of government of Burkina Faso
Sources: en.wikipedia.org
=== Police corruption accusation === In 2007, a representative of Innocence en Danger, a global NGO launched in 1999 to combat pedophilia, at the time with international offices in Germany, France and the United States, said that "the corrupt police [of Portugal] don't care" about the problem, and cited as an example the cases of Mendonça and Madeleine McCann. After three years, the NGO gave up trying to open an office in Portugal, saying that they were pressured by local authorities.
=== Energy use === Early assessments of energy use in grey matter signaling suggested that 95% was attributed to neurons and 5% to astrocytes. However, after discovering that action potentials were more efficient than initially believed, the energy budget was adjusted: 70% for dendrites, 15% for axons, and 7% for astrocytes. Previous accounts assumed that astrocytes captured synaptic K+ solely via Kir4.1 channels. However, it's now understood they also utilize Na+/K+ ATPase. Factoring in this active buffering, astrocytic energy demand increases by >200%. This is supported by 3D neuropil reconstructions indicating similar mitochondrial densities in both cell types, as well as cell-specific transcriptomic and proteomic data, and tricarboxylic acid cycle rates. Therefore "Gram-per-gram, astrocytes turn out to be as expensive as neurons".
Modern vials are often made out of glass or plastic. They are often used as storage for small quantities of liquid used in medical or molecular biology applications. There are several different types of commonly used closure systems. For glass vials, options include screw vials (closed with a screw cap or dropper/pipette), lip vials (closed with a cork or plastic stopper) and crimp vials (closed with a rubber stopper and a metal cap). Plastic vials, which can be moulded in plastic, can have other closure systems, such as 'hinge caps' which snap shut when pressed. These are sometimes called flip-tops or snap caps. The bottom of a vial is often flat, unlike test tubes, which have usually a rounded bottom, but this is often not the case for small hinge-cap or snap-top vials. The small bottle-shaped vials typically used in laboratories are also known as bijou or McCartney's bottles. The bijou bottle tends to be smaller, often with a volume of around 10 milliliters.
== Research == Experiments using cultured cells have demonstrated that humanin has both neuroprotective as well as cytoprotective effects and experiments in rodents have found that it has protective effects in Alzheimer's disease models, Huntington's disease models and stroke models. Humanin is proposed to have myriad neuroprotective and cytoprotective effects. Studies in both cells and rodents have found that administration of humanin or humanin derivatives increases survival and/or physiological parameters in Alzheimer's disease models. In addition to Alzheimer's disease, humanin has other neuroprotective effects against models of Huntington's disease, prion disease, and stroke. Beyond the possible neuroprotective effects, humanin protects against oxidative stress, atherosclerotic plaque formation, and heart attack. Humanin activates chaperone-mediated autophagy in a dose-dependent manner. Humanin decreases production of inflammatory cytokines, which is part of its anti-apoptotic effect. Metabolic effects have also been demonstrated and humanin helps improve survival of pancreatic beta-cells, which may help with type 1 diabetes, and increases insulin sensitivity, which may help with type 2 diabetes. In rats, the humanin analog appears to normalize glucose levels and reduce diabetes symptoms. Rattin shows the same ability as humanin to defend neurons from the toxicity of beta-amyloid, associated with the degeneration in Alzheimer's disease.
==== Suggestibility ==== While research from the 1960s indicated increased suggestibility under the influence of LSD among both mentally ill and healthy individuals, the CIA and US Department of Defense conducted secret mind control experiments in which LSD was administered to unwitting human subjects as part of secret operations MKUltra and Operation Midnight Climax.
Sources: en.wikipedia.org
== Sources == Clayton, W. Woodford; and Nelson, William. History of Bergen and Passaic Counties, New Jersey, with Biographical Sketches of Many of its Pioneers and Prominent Men., Philadelphia: Everts and Peck, 1882. Harvey, Cornelius Burnham (ed.), Genealogical History of Hudson and Bergen Counties, New Jersey. New York: New Jersey Genealogical Publishing Co., 1900. Van Valen, James M. History of Bergen County, New Jersey. New York: New Jersey Publishing and Engraving Co., 1900. Westervelt, Frances A. (Frances Augusta), 1858–1942, History of Bergen County, New Jersey, 1630–1923, Lewis Historical Publishing Company, 1923. Municipal Incorporations of the State of New Jersey (according to Counties) prepared by the Division of Local Government, Department of the Treasury (New Jersey); December 1, 1958.
To maintain a high constant body temperature is energy expensive—mammals therefore need a nutritious and plentiful diet. While the earliest mammals were probably predators, different species have since adapted to meet their dietary requirements in a variety of ways. Some eat other animals—this is a carnivorous diet (and includes insectivorous diets). Other mammals, called herbivores, eat plants, which contain complex carbohydrates such as cellulose. An herbivorous diet includes subtypes such as granivory (seed eating), folivory (leaf eating), frugivory (fruit eating), nectarivory (nectar eating), gummivory (gum eating) and mycophagy (fungus eating). The digestive tract of an herbivore is host to bacteria that ferment these complex substances, and make them available for digestion, which are either housed in the multichambered stomach or in a large cecum. Some mammals are coprophagous, consuming feces to absorb the nutrients not digested when the food was first ingested. An omnivore eats both prey and plants. Carnivorous mammals have a simple digestive tract because the proteins, lipids and minerals found in meat require little in the way of specialized digestion. Exceptions to this include baleen whales who also house gut flora in a multi-chambered stomach, like terrestrial herbivores. The size of an animal is also a factor in determining diet type (Allen's rule). Since small mammals have a high ratio of heat-losing surface area to heat-generating volume, they tend to have high energy requirements and a high metabolic rate.
=== Generic names === Doxepin is the generic name of the drug in English and German and its INNTooltip International Nonproprietary Name and BANTooltip British Approved Name, while doxepin hydrochloride is its USANTooltip United States Adopted Name, USPTooltip United States Pharmacopeia, BANMTooltip British Approved Name, and JANTooltip Japanese Accepted Name. Its generic name in Spanish and Italian and its DCITTooltip Denominazione Comune Italiana are doxepina, in French and its DCFTooltip Dénomination Commune Française are doxépine, and in Latin is doxepinum. The cis or (Z) stereoisomer of doxepin is known as cidoxepin, and this is its INNTooltip International Nonproprietary Name while cidoxepin hydrochloride is its USANTooltip United States Adopted Name.
=== Namibia === The Namibian Government reduced fuel levies by 50% for at least three months, using its National Energy Fund to stabilise prices until the end of June. Gas and oil exploration continues in the country, which expects to start producing oil by 2030.
With a decreasing number of mothers who breast-feed, more infants become obese children as they grow up and are reared on infant formula instead. Fewer children go outside and engage in active play as technology, such as television and video games, keeps children indoors. Rather than walking or biking to a bus-stop or directly to school, more school-age children are driven to school by their parents, reducing physical activity. As family sizes decrease, the children's pester power, their ability to force adults to do what they want, increases. This ability enables them to have easier access to calorie-packed foods, such as candy and soda drinks. The social context around family meal-time plays a role in rates of childhood obesity.
Sources: en.wikipedia.org
They are typically produced from animal connective tissues, such as bovine hide, porcine skin, or fish scales. The raw material is hydrolyzed to break down native collagen into smaller peptide chains.
Collagen peptides have a lower average molecular weight and remain soluble in cold water, whereas gelatin forms a gel when cooled. Both derive from collagen, but their processing and physical properties differ.
No, native collagen is a large, insoluble structural protein, while collagen peptides are shorter, water-soluble fragments. The hydrolysis process alters the protein's size and behavior.
Collagen peptides are short chains of amino acids made by hydrolyzing native collagen. They are water-soluble and do not form gels like gelatin.