moisture uptake comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-01-29. Where a claim depends on a specific study, the study is described rather than over-claimed.
Dry hydrolysate powders are generally stable when kept cool, dry, and sealed, while moisture uptake can cause caking, Maillard browning, and loss of solubility. Higher temperatures accelerate these changes and may alter flavor. Recommended storage conditions often fall between 15 and 25 degrees Celsius with relative humidity below 60 percent. Once reconstituted, liquid hydrolysate solutions support microbial growth and may develop bitterness or haze over time. Packaging in moisture-barrier containers with desiccants helps maintain quality during transport and warehouse storage.
Quality control for hydrolysate ingredients focuses on identity, purity, and consistency, with specifications that may include total protein, hydrolysis level, molecular weight distribution, microbiological limits, heavy metals, and allergen labeling. In some jurisdictions, partially and extensively hydrolyzed formulas are regulated as foods for special dietary uses or as infant formula ingredients. Regulatory status varies by country and intended use. Documentation such as certificates of analysis, safety data sheets, and method validation records supports traceability. Open questions remain about standardizing hydrolysis measurements across suppliers and laboratories.
Testing hydrolysate powders typically begins with proximate analysis for moisture, ash, fat, and total nitrogen. Protein content is calculated from nitrogen using a conversion factor, most often Kjeldahl or Dumas combustion. Peptide size distribution is assessed by size-exclusion chromatography, reversed-phase HPLC, or mass spectrometry. Sodium dodecyl sulfate polyacrylamide gel electrophoresis can show residual intact protein bands. Free amino groups may be quantified by colorimetric assays to estimate cleavage extent, though different methods and laboratories are not always directly comparable.
Composition reflects the whey source and the extent of hydrolysis. Beta-lactoglobulin and alpha-lactalbumin fragments are common, and sweet whey may contribute glycomacropeptide. The amino acid profile remains broadly similar to intact whey protein, but peptide size affects how quickly nitrogen appears in blood after ingestion. Bitter notes often arise from short peptides with hydrophobic residues. Hydrolysates are used in sports nutrition, infant formula, and clinical nutrition, though effects on muscle, immunity, or allergy risk are separate research questions rather than guaranteed properties.
Whey protein hydrolysate is derived from whey, the liquid byproduct of cheese-making or casein coagulation. It consists of peptides and free amino acids produced when peptide bonds are cleaved by enzymes or acid. Hydrolysis lowers the average molecular weight and can change solubility, viscosity, and bitterness. The degree of hydrolysis indicates the proportion of peptide bonds broken and distinguishes partial from extensive hydrolysates. Commercial ingredients vary widely in peptide size, mineral content, and lactose level.
Production usually starts with whey protein concentrate or isolate. The material is dissolved, pasteurized, and adjusted to conditions that favor a chosen protease, such as trypsin, pepsin, or papain. Enzyme choice, pH, temperature, and reaction time determine peptide length, terminal residues, and functional behavior. After hydrolysis, the enzyme is inactivated by heat or pH change, and the liquid is clarified, filtered, concentrated, and dried. Membrane filtration can further fractionate peptides and remove some minerals or lactose. The final powder is typically spray-dried.
| Property | Value | Notes |
|---|---|---|
| Moisture content | ≤5% typical | Higher moisture promotes caking and browning |
| pH (5% solution) | 6.0–7.5 typical | Varies with hydrolysis and neutralization |
| Ash content | 1–8% | Depends on demineralization and neutralization salts |
| Microbiological limit | Total aerobic count <10^4 CFU/g typical | Specifications vary by grade and market |
| Shelf life | 12–24 months unopened | Cool, dry storage extends stability |
Quality control for hydrolysates often includes allergen and contaminant checks. Because whey is a milk-derived ingredient, milk protein residues may remain, and the extent to which hydrolysis reduces allergenic potential is product-specific and not fully predictable. Tests may screen for heavy metals, melamine, pesticides, and microbial indicators. Enzyme residues and processing aids are also monitored when regulations require it. Batch-to-batch consistency is assessed through peptide mapping or functional tests, since small process changes can alter taste, solubility, or nutritional performance.
Laboratories characterize whey protein hydrolysate by several complementary methods. Total nitrogen or Kjeldahl analysis estimates crude protein, while amino acid analysis gives a more detailed composition. Size-exclusion chromatography and mass spectrometry separate peptides by molecular weight and can reveal the distribution of chain lengths. Degree of hydrolysis is often calculated from free amino groups using trinitrobenzenesulfonic acid or o-phthaldialdehyde assays. No single measurement captures all relevant properties, so specifications usually combine protein content, peptide profile, moisture, ash, and microbial limits.
Molecular weight distribution is a central compositional feature, and hydrolysis shifts the population toward lower-mass peptides, often below ten kilodaltons in extensively treated products. Enzyme choice, reaction time, temperature, pH, and enzyme-to-substrate ratio influence the peptide profile. Ultrafiltration or diafiltration may remove enzymes, salts, and smaller molecules. Because peptide size affects solubility, taste, foaming, and digestibility, manufacturers specify molecular weight ranges. However, two hydrolysates with similar average molecular weight can differ in peptide sequence and functional behavior.
Bitterness often increases with hydrolysis because hydrophobic peptides are exposed. Processing strategies therefore include selecting enzymes that cleave at specific sites, using exopeptidases to remove terminal hydrophobic residues, or blending hydrolysates with other ingredients. Allergenicity is another consideration: extensive hydrolysis can reduce IgE-binding epitopes, but it does not guarantee absence of allergenic potential. Regulatory frameworks vary in how they classify hydrolyzed whey for infant formula or sports products. Claims about reduced allergenicity or faster absorption depend on the specific product and study design, and are not uniform across all hydrolysates.
Whey protein hydrolysate is made by cleaving peptide bonds in whey proteins. The starting material is usually whey protein concentrate or isolate obtained during cheese or casein production. Proteolytic enzymes, acid, or heat can drive hydrolysis, although commercial processes favor controlled enzymatic treatment. The degree of hydrolysis describes the proportion of peptide bonds broken and separates partial from extensive hydrolysates. The resulting powder contains short peptides, free amino acids, residual intact protein, minerals, lactose, and fat in proportions that depend on the starting whey and downstream filtration.
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.
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.
=== Ritual Magic === During the Renaissance in Iceland, blotting paper had a small religious significance as a tool for ceremonial magic. This becomes noticeable in the Galdrabók, a grimoire (magic spell book) of the period, in which the reader is directed to draw sigils on blotting paper to attain success.
Keuning S, Janssen DB, Witholt B (1985). "Purification and characterization of hydrolytic haloalkane dehalogenase from Xanthobacter autotrophicus GJ10". J. Bacteriol. 163 (2): 635–9. doi:10.1128/JB.163.2.635-639.1985. PMC 219169. PMID 4019411. Scholtz R, Leisinger T, Suter F, Cook AM (1987). "Characterization of 1-chlorohexane halidohydrolase, a dehalogenase of wide substrate range from an Arthrobacter sp". J. Bacteriol. 169 (11): 5016–21. doi:10.1128/jb.169.11.5016-5021.1987. PMC 213902. PMID 3667524. Yokota T, Omori T, Kodama T (1987). "Purification and properties of haloalkane dehalogenase from Corynebacterium sp. strain m15-3". J. Bacteriol. 169 (9): 4049–54. doi:10.1128/jb.169.9.4049-4054.1987. PMC 213707. PMID 3624201. Poelarends GJ, van Hylckama Vlieg JE, Marchesi JR, Freitas Dos Santos LM, Janssen DB (1999). "Degradation of 1,2-dibromoethane by Mycobacterium sp. strain GP1". J. Bacteriol. 181 (7): 2050–8. doi:10.1128/JB.181.7.2050-2058.1999. PMC 93616. PMID 10094681. Poelarends GJ, Wilkens M, Larkin MJ, van Elsas JD, Janssen DB (1999). "Degradation of 1,3-dichloropropene by pseudomonas cichorii 170". Appl. Environ. Microbiol. 64 (8): 2931–6. doi:10.1128/AEM.64.8.2931-2936.1998. PMC 106795. PMID 9687453. Nagata Y, Miyauchi K, Damborsky J, Manova K, Ansorgova A, Takagi M (1997). "Purification and characterization of a haloalkane dehalogenase of a new substrate class from a gamma-hexachlorocyclohexane-degrading bacterium, Sphingomonas paucimobilis UT26". Appl. Environ. Microbiol. 63 (9): 3707–10. Bibcode:1997ApEnM..63.3707N. doi:10.1128/AEM.63.9.3707-3710.1997.
== Software Packages == Many chromatography software packages are provided by manufacturers, and many of them only provide a simple interface to acquire data. They also provide different tools to analyze this data. The following is a list of software and the (unexplained) tools that each provides. Please note that some of them were discontinued with the years.
=== Scientific attempts to quantify the pain of freeze branding === Even though current scientific methodologies cannot adequately distinguish between reflex response and the lay understanding of pain, scientific methods are well suited to comparing two stimuli and making a reasonable assertion as to which is objectively less noxious. Freeze branding has frequently been hailed as a less noxious means of permanently denoting ownership of livestock. Despite this, the claim that freeze branding is inherently less painful than hot branding has been challenged. These challenges provoked scientific studies to determine the matter objectively and they have attempted to measure the pain experienced by animals during and after their branding.
Adenylate cyclase manufactures cyclic adenosine monophosphate (cyclic AMP or cAMP), which activates protein kinase A (cAMP-dependent protein kinase). This enzyme, in turn, activates phosphorylase kinase, which then phosphorylates glycogen phosphorylase b (PYG b), converting it into the active form called phosphorylase a (PYG a). Phosphorylase a is the enzyme responsible for the release of glucose 1-phosphate from glycogen polymers. An example of the pathway would be when glucagon binds to a transmembrane protein. The transmembrane proteins interacts with Gɑβ𝛾. Gαs separates from Gβ𝛾 and interacts with the transmembrane protein adenylyl cyclase. Adenylyl cyclase catalyzes the conversion of ATP to cAMP. cAMP binds to protein kinase A, and the complex phosphorylates glycogen phosphorylase kinase. Phosphorylated glycogen phosphorylase kinase phosphorylates glycogen phosphorylase. Phosphorylated glycogen phosphorylase clips glucose units from glycogen as glucose 1-phosphate. Additionally, the coordinated control of glycolysis and gluconeogenesis in the liver is adjusted by the phosphorylation state of the enzymes that catalyze the formation of a potent activator of glycolysis called fructose 2,6-bisphosphate. The enzyme protein kinase A (PKA) that was stimulated by the cascade initiated by glucagon will also phosphorylate a single serine residue of the bifunctional polypeptide chain containing both the enzymes fructose 2,6-bisphosphatase and phosphofructokinase-2. This covalent phosphorylation initiated by glucagon activates the former and inhibits the latter.
Sources: en.wikipedia.org
This mating can cause bi-daily surges of prolactin which would normally occur in rodent pregnancy. Prolactin surges initiate the secretion of progesterone which maintains pregnancy and hence can initiate pseudopregnancy. The false maintenance of pregnancy exhibits the outward physical symptoms of pregnancy, in the absence of a foetus. Prolactin receptor activation is essential for normal mammary gland development during puberty in mice. Adult virgin female prolactin receptor knockout mice have much smaller and less developed mammary glands than their wild-type counterparts. Prolactin and prolactin receptor signaling are also essential for maturation of the mammary glands during pregnancy in mice.
==== Canada ==== In Canada, Pfizer's patent 2,324,324 for Revatio (sildenafil used to treat pulmonary hypertension) was found invalid by the Federal Court in June 2010, on an application by Ratiopharm Inc. On 8 November 2012, the Supreme Court of Canada ruled that Pfizer's patent 2,163,446 on Viagra was invalid from the beginning because the company did not provide full disclosure in its application. The decision, Teva Canada Ltd. v. Pfizer Canada Inc., pointed to section 27(3)(b) of The Patent Act which requires that disclosure must include sufficient information "to enable any person skilled in the art or science to which it pertains" to produce it. It added further: "As a matter of policy and sound statutory interpretation, patentees cannot be allowed to 'game' the system in this way. This, in my view, is the key issue in this appeal." Teva Canada launched Novo-Sildenafil, a generic version of Viagra, on the day the Supreme Court of Canada released its decision. To remain competitive, Pfizer then reduced the price of Viagra in Canada. However, on 9 November 2012, Pfizer filed a motion for a re-hearing of the appeal in the Supreme Court of Canada, on the grounds that the court accidentally exceeded its jurisdiction by voiding the patent. Finally, on 22 April 2013, the Supreme Court of Canada invalidated Pfizer's patent altogether.
Human studies identify the risk of cognitive impairments and decline (dementia) including the Alzheimer's type. Diabetic cardiomyopathy, damage to the heart muscle, leading to impaired relaxation and filling of the heart with blood (diastolic dysfunction) and eventually heart failure; this condition can occur independent of damage done to the blood vessels over time from high levels of blood glucose. Erectile Dysfunction, Men with erectile dysfunction and those with diabetes are likely to have experienced the problem as much as 10 to 15 years earlier than men without and are at a significantly higher risk, with a prevalence rate of 52.5%, 3.5-fold higher than those without DM. And defined as a consistent inability to have an erection firm enough for sexual intercourse. Women may also experience forms of sexual dysfunction due to damage to small blood vessels and nerves. Periodontal disease (gum disease): is associated with diabetes Diabetes is a substantial risk factor for periodontitis, with diabetics having a threefold higher risk than non-diabetics. In assessing increased risk, glycemic control is essential. Research primarily focuses on type 2 diabetes, but type 1 diabetes also increases risk, particularly in children and young people.
Usually made for promotional purposes, it is closer to an advertisement than a classic documentary. Modern lightweight digital video cameras and computer-based editing have greatly aided documentary makers, as has the dramatic drop in equipment prices. The first film to take full advantage of this change was Martin Kunert and Eric Manes' Voices of Iraq, where 150 DV cameras were sent to Iraq during the war and passed out to Iraqis to record themselves.
==== August 2015 norovirus ==== A norovirus outbreak occurred in August 2015 at a Simi Valley, California, location, ultimately affecting more than 200 people. Ventura County health inspectors found health violations during inspections following the outbreak. In January 2016, a federal grand jury issued a subpoena as part of a criminal investigation into the outbreak.
Sources: en.wikipedia.org
==== Czech Republic ==== Possession of more than 200 mg of 2C-B is punishable with a two years jail sentence. Smaller amount is punishable by a fine. The 200 mg threshold is merely a guideline which the court can reconsider depending on circumstances.
When the mixed sulfates were pure enough, they were once more converted to mixed chlorides; barium and radium thereafter were separated by fractional crystallisation while monitoring the progress using a spectroscope (radium gives characteristic red lines in contrast to the green barium lines), and the electroscope. After the isolation of radium by Marie and Pierre Curie from uranium ore from Jáchymov, several scientists started to isolate radium in small quantities. Later, small companies purchased mine tailings from Jáchymov mines and started isolating radium. In 1904, the Austrian government nationalised the mines and stopped exporting raw ore. Until 1912, when radium production increased, radium availability was low. The formation of an Austrian monopoly and the strong urge of other countries to have access to radium led to a worldwide search for uranium ores. The United States took over as leading producer in the early 1910s, producing 70 g total from 1913 to 1920 in Pittsburgh alone. The Curies' process was still used for industrial radium extraction in 1940, but mixed bromides were then used for the fractionation. If the barium content of the uranium ore is not high enough, additional barium can be added to carry the radium. These processes were applied to high grade uranium ores but may not have worked well with low grade ores. Small amounts of radium were still extracted from uranium ore by this method of mixed precipitation and ion exchange as late as the 1990s, but as of 2011, it is extracted only from spent nuclear fuel.
=== Intracrines and regenerative Medicine === The discovery of intracrine loops in stem cell regulation has profound implications for regenerative medicine. Because intracrines can establish long-lasting differentiation programs, they offer potential therapeutic targets for tissue regeneration and repair. For example, in cardiac repair, HMGB1 has been shown to enhance the proliferation and differentiation of cardiac stem cells following myocardial infarction, suggesting that modulating intracrine pathways could improve heart regeneration. The ability of certain intracrines to reprogram cells into pluripotent-like states also opens new avenues for regenerative therapies. Oct3/4, Sox2, and Nanog, all of which are involved in maintaining stem cell pluripotency, can potentially be introduced into cells to drive reprogramming without the need for genetic modification. This approach could provide safer and more controlled methods for generating patient-specific stem cells.
Graves' disease. An autoimmune disease (usually, the most common cause with 50–80% worldwide, although this varies substantially with location- i.e., 47% in Switzerland (Horst et al., 1987) to 90% in the USA (Hamburger et al. 1981)). Thought to be due to varying levels of iodine in the diet. It is eight times more common in females than males and often occurs in young females, around 20 to 40 years of age. Toxic thyroid adenoma (the most common cause in Switzerland, 53%, thought to be atypical due to a low level of dietary iodine in this country) Toxic multinodular goiter High blood levels of thyroid hormones (most accurately termed hyperthyroxinemia) can occur for several other reasons:
Sources: en.wikipedia.org
Keep the powder sealed in a cool, dry place away from direct sunlight and strong odors. Typical targets are 15 to 25 degrees Celsius and low relative humidity. After opening, use within the manufacturer's recommended period.
Size-exclusion chromatography and mass spectrometry provide molecular weight or mass information. Electrophoresis can reveal intact protein bands and larger fragments. No single method captures the complete peptide profile.
Not always, because assays and calculation methods differ. Values may reflect free amino groups, pH change, or nitrogen solubility. Comparisons require method details and reference standards.
Whey protein hydrolysate is whey protein that has been treated with enzymes or acid to break peptide bonds into smaller peptides. It is not a different protein source; it is a modified form of whey protein. Commercial products range from partially to extensively hydrolyzed.