The short version of marker peptide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
Whey protein hydrolysate is a dairy ingredient made by treating whey protein with enzymes or, less often, acid or heat to break peptide bonds. The starting material is typically sweet whey or acid whey from cheese making, first concentrated and dried into whey protein concentrate or isolate. Hydrolysis shortens long protein chains into smaller peptides, changing functional properties such as solubility, viscosity, and foam formation. The resulting powder contains peptides, residual intact protein, moisture, minerals, and variable amounts of lactose and fat depending on the starting material.
Enzymatic hydrolysis usually uses proteases from microbial, plant, or animal sources. The enzyme choice, pH, temperature, and reaction time determine which peptide bonds are cleaved and the final peptide profile. After hydrolysis, the enzyme is inactivated by heat, and the mixture is clarified, filtered, concentrated, and spray-dried. Manufacturers may use ultrafiltration to remove larger peptides or minerals. The degree of hydrolysis, often reported as a percentage, describes the proportion of peptide bonds broken. A higher degree generally means shorter peptides, but it does not by itself define taste, allergenicity, or biological activity.
Whey protein hydrolysate appears in foods, infant formula, sports nutrition, and specialized clinical nutrition. Its production can reduce viscosity and improve heat stability compared with intact whey protein. Bitterness is common because short hydrophobic peptides can activate bitter taste receptors. The ingredient is not the same as free amino acids; it remains a mixture of peptides of different lengths. Composition varies by supplier, enzyme, and process, so two hydrolysates with the same protein content may behave differently in a formulation.
Quality control checks identity, composition, and contaminants. Moisture, ash, fat, and carbohydrate are measured by standard methods, and microbiological limits are set for total counts, coliforms, and specific pathogens. Heavy metals and pesticide residues may be monitored depending on market requirements. Adulteration with intact whey protein or individual amino acids is possible, so peptide fingerprints and free amino acid profiles can help verify authenticity. Regulatory frameworks vary: some countries treat hydrolyzed whey as a conventional dairy ingredient, while infant formula uses face additional compositional rules. Which marker peptides best confirm source and processing remains an open analytical question.
Storage stability depends on moisture, temperature, and packaging. Dry powders with low water activity resist microbial growth, but they can still absorb water, develop off-colors through Maillard reactions, or oxidize residual lipids. Sealed containers kept in a cool, dry place are standard. Stability studies typically monitor moisture, solubility, color, peptide size, and microbial counts over months. Established practice favors low humidity and moderate temperatures. How brief excursions above recommended conditions affect peptide profiles and sensory qualities is less predictable and may depend on the specific product matrix.
Laboratories characterize hydrolyzed whey protein with several complementary assays. Total nitrogen methods, such as Kjeldahl or Dumas, estimate protein content using a dairy conversion factor. Free amino group assays, including TNBS and OPA, track the extent of peptide-bond cleavage. Size-exclusion chromatography and reversed-phase HPLC reveal peptide size distributions and hydrophobicity. Mass spectrometry can identify specific peptides, while amino acid analysis quantifies individual residues. No single test captures every relevant property, so results are usually interpreted together with process records and specification limits.
| Property | Value | Notes |
|---|---|---|
| Appearance | Off-white to cream powder | Color can vary with starting whey and drying conditions |
| Protein content | Typically 70-90% dry basis | Depends on whether concentrate or isolate is used |
| Degree of hydrolysis | Often 5-30% for commercial hydrolysates | Ranges vary by intended application and process |
| Solubility | High in water at neutral pH | Smaller peptides generally dissolve more readily than intact protein |
| Common synonyms | Hydrolyzed whey protein; whey peptide | Terms are not always standardized across suppliers |
Composition reflects both the original whey and the hydrolysis process. Products contain protein-derived peptides, variable ash, moisture, and residual lactose or fat depending on filtration. Some free amino acids increase during hydrolysis, and bitterness often rises with higher degrees of hydrolysis due to exposed hydrophobic residues. Mineral profiles vary with the whey source and any neutralization step. Allergenicity may be reduced in extensively hydrolyzed products, but the extent depends on residual intact protein and peptide size, and this remains a subject of ongoing study.
Whey protein hydrolysate is a dairy-derived ingredient made by treating whey protein with enzymes or acid to break peptide bonds. The starting material is typically sweet whey or acid whey from cheese manufacture, which contains beta-lactoglobulin, alpha-lactalbumin, bovine serum albumin, and immunoglobulins. Hydrolysis shortens protein chains into peptides and free amino acids, changing solubility, viscosity, and taste. The extent of breakdown is described by degree of hydrolysis, a percentage of cleaved peptide bonds. This value influences functional and sensory properties but does not by itself define a specific molecular profile.
Commercial production usually begins with whey protein concentrate or isolate, not raw whey, to reduce fat and lactose. Food-grade proteases from bacterial or plant sources are added under controlled temperature and pH, then inactivated by heat or pH adjustment. The resulting liquid may be clarified, filtered, concentrated, and spray-dried into powder. Enzyme choice, reaction time, and pretreatment conditions create products with different peptide size distributions. Because these variables are proprietary and not standardized, two hydrolysates with the same degree of hydrolysis can differ in peptide sequences and mineral content.
Storage stability depends on moisture, temperature, oxygen, and packaging, and hydrolysates are hygroscopic and can cake when exposed to humid air. Maillard reactions between peptides and residual lactose can cause browning and flavor changes during warm storage, while lipid oxidation may develop if residual fat is present. Cool, dry conditions and sealed containers slow these reactions. Shelf-life studies typically monitor moisture, color, solubility, molecular weight profile, and microbial counts over time. Accelerated tests estimate stability, but real-time data remain the reference for shelf-life assignment.
Regulatory status differs by country and intended use. In many jurisdictions, whey protein hydrolysate is regulated as a food ingredient, while specific infant formula or medical food uses may require additional review. Labeling rules govern protein content claims, allergen statements, and terms such as partially hydrolyzed or extensively hydrolyzed. Analytical methods for degree of hydrolysis are not fully standardized, so values can depend on the assay. This variability makes direct comparison between products difficult unless the method and reference material are stated.
Lidocain wird in der Human- und Veterinärmedizin als gut und schnell wirksames örtliches Betäubungsmittel häufig eingesetzt. Das Medikament ist in der Liste der unentbehrlichen Medikamente der WHO dreifach aufgeführt, was dessen Stellenwert verdeutlicht. Hierzu wird Lidocain entweder in das Gewebe eingespritzt (Infiltrationsanästhesie), um so ein kleineres Areal zu betäuben, wie es für die Naht einer Platzwunde oder ähnliche kleinere Eingriffe notwendig ist. Alternativ wird es in den Bereich eines Nervs gespritzt, um so dessen Versorgungsgebiet zu betäuben (Leitungsanästhesie). Das Medikament sollte ein bis drei Minuten einwirken, dann ist eine ausreichende Lokalanästhesie gegeben. Die Wirkdauer ist dosisabhängig und beträgt ein bis drei Stunden. Da Lidocain gut über die Schleimhaut aufgenommen wird, gibt es diesen Wirkstoff in Form von Sprays oder Salben für die Oberflächenanästhesie. Durch die Kombination von Lidocain mit dem Anästhetikum Prilocain im Verhältnis 1:1 entsteht ein eutektisches Gemisch („Eutectic Mixture of Local Anesthetic“, EMLA), das bei Hauttemperatur flüssig ist und eine gute Penetration in die Haut aufweist. Die Mischung wird als Wirkstoff in der Oberflächenanästhesie der Haut eingesetzt. Ebenso wird eine eutektische Mischung mit Tetracain verwendet (Pliaglis). Eine weitere pharmazeutische Entwicklung ist die liposomale Verkapselung von Lidocain (LMX4), die seit 1998 therapeutisch verfügbar ist.
Diese Formulierungsform soll sich günstig auf die Anwendungseigenschaften auswirken, da die Einwirkdauer auf der Haut verkürzt, die Wirkdauer verlängert und Nebenwirkungen verringert sein sollen. Ferner ist Lidocain Wirkstoff in Sprays und Gleitmitteln zur Erleichterung der endotrachealen Intubation und des Einlegens eines Blasenkatheters. Lidocain ist für die parenterale Anwendung, bis auf wenige Ausnahmen, verschreibungspflichtig, ebenso für die Anwendung am Auge und am äußeren Gehörgang. Für die subkutane bzw. intramuskuläre Regionalanästhesie in der Geburtshilfe (Durchführung von Dammschnitten, Naht von Dammschnitten und -rissen) darf Lidocain in Deutschland in beschränkter Dosis und in Konzentrationen bis 1 % ohne ärztliche Verschreibung an Hebammen und Entbindungspfleger abgegeben werden. Seit 2007 ist Lidocain in verschiedenen europäischen Ländern in Form eines transdermalen Pflasters mit fünf Gewichtsprozent Lidocain erhältlich, das unter dem Handelsnamen Versatis zur Behandlung neuropathischer Schmerzen nach Herpes-Zoster-Infektion zugelassen ist. Im Rahmen von größeren bauchchirurgischen Eingriffen führt intravenöses Lidocain zu geringeren Schmerzen, weniger Übelkeit und besserer Darmfunktion. Neben der Unterdrückung von Schmerzreizen im OP-Gebiet wird auch eine hemmende Wirkung auf Granulozyten für diese Wirkung verantwortlich gemacht. Deshalb kann intravenös verabreichtes Lidocain für bestimmte Operationen eingesetzt werden, sofern ein Periduralkatheter, der den Goldstandard bildet, nicht vorhanden ist.
Dieser Off-Label-Einsatz benötigt vor der OP die Einwilligung des Patienten. Die Dosierungsschemata beginnen meist mit einer initialen Kurzinfusion von 1,5 mg/kg gefolgt von einer Dauerinfusion von 1,5 mg/kg/h während der OP und einer postoperativen Dosis von 1,33 mg/kg/h für ca. 4 Stunden.
Lidocain ist das von Zahnärzten am häufigsten eingesetzte Mittel zur örtlichen Betäubung. Es hat eine geringe Rate an unerwünschten Wirkungen sowie ein geringes Allergiepotential. Es kann Epinephrin (Adrenalin) zugesetzt werden, welches die Wirkungsdauer des Lidocains verlängert. Dies geschieht durch eine durch das Epinephrin eintretende Gefäßverengung, wodurch ein langsamerer Abtransport in die Blutbahn des Patienten erfolgt.
Sources: de.wikipedia.org
It is whey protein that has been partially broken down into smaller peptides through hydrolysis. The powder still contains a mixture of peptides, residual protein, minerals, and other whey components. It is used as a food ingredient rather than a single pure compound.
Proteases cleave peptide bonds, reducing molecular size and altering solubility, viscosity, and taste. The extent of change depends on the enzyme and reaction conditions. Hydrolysis does not remove all intact protein or guarantee a specific peptide profile.
Degree of hydrolysis is the percentage of peptide bonds cleaved during the reaction. It is a processing measure, not a direct measure of peptide size distribution or function. Two products with the same degree can still differ in peptide sequence and sensory properties.
Common laboratory methods measure free amino groups with TNBS or OPA reagents. The result is converted to a percentage using a reference standard and a defined protocol. Values are method-dependent, so comparisons require the same assay conditions.