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Scientists first isolated and identified 2-Aminoisobutyric Acid during the early developments of amino acid research in the early twentieth century, a period filled with energetic chemical analysis and the birth of peptide science. Chemists noticed this molecule’s unusual structure—a non-proteinogenic alpha-amino acid, carrying two methyl groups on the alpha carbon, giving it a bulky and symmetric shape unlike the more familiar glycine or alanine. The earliest literature notes its presence in certain antibiotics and peptide natural products, making it a curiosity among those cataloguing amino acid diversity, and fueling years of structural chemistry and biochemistry research. Its presence in peptide antibiotics like alamethicin brought it renewed attention in later decades, as researchers chased new modes of action for antimicrobial therapy.
2-Aminoisobutyric Acid, often abbreviated as AIB, stands out in any chemical line-up for its small, compact, and highly branched form. Unlike the amino acids carried in every cell of every living thing, this one does not make its way into proteins through the standard genetic machinery. Its molecular formula—C4H9NO2—tells its own story, and its melting point, solubility, and crystalline habit have all been documented in the classic laboratory literature. White crystalline powder describes its crude aspect, but its talent really comes through when blended into peptides, thanks to steric hindrance preventing regular protein folding and enzyme breakdown, a property cherished by peptide chemists. It dissolves in water and alcohol, granting versatility for synthesis and labs, but remains notably stable under typical conditions, resisting easy degradation.
AIB usually comes with tight purity specifications, particularly in research-grade materials geared for sensitive experiments. Labs typically require not less than 98% purity, and careful labeling around stereochemistry, as the racemic mixture and individual enantiomers carry distinct applications. Careful tracking and documentation matter for work under regulatory umbrellas, such as peptide drug development or food additive research, because impurities or mislabeling can distort experimental data. Regulatory guidelines from agencies such as the US Pharmacopeia or the European Medicines Agency focus on a handful of critical parameters, like residual solvents, heavy metals, and consistent labeling regarding stereoisomer content.
For years, chemists favored the Strecker synthesis route: forming the amino acid from an aldehyde, hydrogen cyanide, and ammonia, then hydrolyzing the intermediate to reach the finished product. Industrial chemists might lean on other routes, too, including catalytic hydrogenation or even biosynthetic tactics by harnessing microorganisms engineered to gather specific precursors. Regardless of the route, successful production hangs on precise temperature control, skilled purification, and rigorous quality tests. In a hands-on setting, synthetic efforts always compete with the drive for efficiency and purity, pushing everyone involved to revise processes and take a hard look at yield and reproducibility.
AIB proves refreshingly stubborn against many enzymatic attacks due to those methyl groups blocking access, which is precisely why chemists slip it into peptide chains to increase stability. Peptide synthesis crews often slip in AIB residues to create alpha-helices that persist under conditions where natural peptides would fall apart. This bulky amino acid derails the ordinary breakdown by proteases, extending lifetime in biological settings—an essential improvement for both therapy design and industrial use. Chemical modification efforts have included attaching protective groups for peptide synthesis, or activating residues for further reaction, expanding the toolbox for those hunting new materials and medicines.
Anyone in the field will run into a scramble of names: 2-Methylalanine is probably the most common alternative, alongside alpha-aminoisobutyric acid and sometimes simply “AIB.” Literature scattered over decades includes a handful of different spellings—testament to the global spread of research and the old-school era of organic chemistry. Recognizing these synonyms can reduce confusion when piecing together older papers or cross-referencing international standards, especially as product names sometimes differ across suppliers.
Work with AIB should follow the classic best practices of laboratory safety. This amino acid does not show high acute toxicity, but precision handling avoids accidental inhalation or prolonged skin contact. Material Safety Data Sheets flag routine hazards, centering on dust inhalation and possible mild irritation. Experience says the rulebook—closed containers, gloves, goggles, and dilution under the fume hood—protects both researcher and result. In larger-scale setups, air handling and spill management grow essential, and monitoring for chronic low-level exposure forms part of the safety culture. For anyone in development, regulatory compliance with standards from agencies such as OSHA or REACH ensures work continues without bureaucratic or ethical setbacks.
Peptide chemistry numbers among the primary arenas for AIB, given its power to stabilize alpha-helical structures and block breakdown by proteases. Researchers incorporate it into antibiotics, antifungals, and experimental cancer therapies, targeting more durable drugs that survive in the harsh environment of blood and tissue. In agricultural chemistry, it finds space as a performance booster for certain plant protection agents by resisting rapid breakdown under field conditions. Material scientists eye its use for novel polymers and smart hydrogels, drawing on its ability to persist in challenging settings—showcasing how a simple molecular tweak can unlock a wealth of commercial and social utility. My own years in the lab showed AIB as a quiet but powerful tool: a small addition to a peptide sometimes delivering a leap in stability or activity.
Academic groups have invested decades testing how bulking up amino acid chains with AIB changes biological and material properties. Much effort now pivots toward developing peptide therapeutics that demand robust resistance to proteases, drawing on the lessons of past antibiotic development. Teams leverage machine learning to model longer peptide sequences, exploring how sprinkled AIB residues alter folding pathways and boost desired outcomes. There’s a growing push to engineer biosynthetic pathways, cutting greenhouse gas emissions and energy costs, as eco-friendly chemistry moves from talking point to fundamental requirement. At international conferences, you hear discussions about cost-effective preparation, more efficient purification, and the harnessing of synthetic biology to drive next-generation products.
Toxicological studies peg AIB as relatively tame compared to most industrial chemicals or biologically active amino acid derivatives. Experiments with model organisms show low acute toxicity and minimal bioaccumulation under normal exposures. Researchers constantly test how it behaves in finished therapies, both to establish safety margins and to monitor for any chronic issues—especially since small molecules often show up where they’re least expected. Regulatory agencies expect clear, well-documented safety data before granting any use in commercial products, and ongoing research tracks long-term outcomes in medical and agricultural settings. In my own work, standard bench safety protocols handled AIB comfortably, but vigilance remains warranted if scaling up or introducing it into new consumer products.
The path ahead for AIB stretches into some of the major questions chemistry faces today: how to build more resilient medicines, design greener manufacturing methods, and unlock new properties in polymer science. Peptide drugs for rare diseases or cancers now stay active longer, granting real therapeutic benefit by resisting breakdown, thanks to insights gleaned from deploying AIB. Synthetic biology holds promise for building these molecules inside living cells, trimming waste from traditional chemistry. As society sharpens its focus on sustainable chemicals, AIB may feature more often in new materials that shrug off harsh conditions, or in replacing older, less environmentally-friendly stabilizers. The commitment to safe, evidence-based development stands as a shared responsibility—one that, with continued clear research and open debate, promises a rich future both for AIB and the fields it touches.
2-Aminoisobutyric acid, often called AIB, never comes up much in everyday conversation. Still, anyone with experience in pharmaceutical or biochemical research will recognize its potential. This tiny molecule has proven useful in drugs, lab experiments, and even crop protection. Its versatility highlights why taking a closer look at “non-standard” amino acids often opens new doors in science and medicine.
Most scientists first encounter AIB in discussions about peptide stability. Regular proteins in our bodies get chewed up fast by enzymes. Tossing AIB into a synthetic peptide often makes it much tougher for those enzymes to break things down. I’ve seen studies comparing regular peptides to ones enhanced with AIB—the difference in stability can be dramatic. This keeps medicine active in the body longer. Drug developers add AIB to peptides like enfuvirtide, a well-known HIV drug, increasing the half-life and improving patient outcomes.
Another feature of AIB is its rigid structure. It loves to nudge peptides into specific shapes, unlike other amino acids that flex around more. This strength often gets used in designing molecules that block or mimic signaling pathways in cells. In my time working with research teams, we used AIB to “lock” peptides into the helical shape needed to bind tightly to a disease target. This approach creates a focused effect, which makes off-target issues less likely. Such design tricks play an important role in emerging cancer treatments, where precision can mean the difference between success and severe side effects.
Not everything about AIB happens at the pharmacy. In academic labs, chemists use it to study protein folds and enzyme functions. Plugging AIB into a peptide sequence lets researchers track how proteins assemble, misfold, or interact with other molecules. As an undergraduate, I remember peptide synthesis experiments that swapped out normal amino acids for AIB to see just how much a small tweak changed a protein’s behavior. Sometimes, discoveries made here spark ideas for medical innovation years down the road.
Surprisingly, AIB also helps in agriculture. Plant scientists have used it to study and control plant stress responses. Some research suggests AIB blocks the hormone system that triggers unwanted ripening or response to drought, helping keep fruits fresh during transport or improving resistance to harsh conditions. With global food needs growing, this type of tool matters more than ever.
Like with all powerful molecular tools, safety and environmental effects deserve real attention. There’s a responsibility to test for toxicity, both in people and in ecosystems, before wide adoption. The scientific community now leans on strict guidelines to reduce risks and ensure substances like AIB don’t leave unexpected footprints in soil, water, or the human body.
2-Aminoisobutyric acid remains a quiet hero in several branches of science. Its growing list of uses keeps surprising researchers. Experience tells me the greatest value often comes from curiosity—wondering how one little molecule can solve persistent problems, from deeper drug pipelines to safer food on our tables.
2-Aminoisobutyric acid, sometimes called AIB, pops up in discussions about amino acids and food additives. It's a non-proteinogenic amino acid, meaning it’s not one of the standard amino acids your body uses to build proteins. Instead, it shows up in certain specialized peptides and, in some cases, as a lab-made supplement.
Food scientists and nutrition experts have studied AIB, often looking at its place in sports nutrition and dietary supplements. Some labs add AIB to peptide studies because it resists the enzymes in the body that break down proteins. This helps researchers observe how stable certain drug compounds stay in the gut or bloodstream.
In rare cases, AIB enters formulas for processed foods or specialty diets aimed at gut health or specific metabolic concerns. It isn't found in large amounts at your local grocery store. You will see far more of the usual amino acids like glutamine or leucine in powders and snack bars.
Here’s where facts push past hype. The World Health Organization (WHO), U.S. Food and Drug Administration (FDA), and European Food Safety Authority (EFSA) don't list AIB as a direct food additive approved for open use. The available research on AIB in humans is limited. Animal studies haven’t flagged major red alarms, but those often miss the full story about chronic exposure or unique human responses.
Labs rely on standardized tests for toxicity, absorption, and metabolism. Research shows rats can handle moderate AIB doses without obvious harm over short periods. Long-term outcomes haven’t rolled in yet. As a science writer, I rely on trusted agencies like the FDA to clear compounds for everyday eating. A stamp of approval only comes after real human trials, years of follow-up, and close scrutiny of every side effect.
Most people don’t run across AIB at home or in a balanced diet. Heavy supplement users or people experimenting with custom fitness stacks might see it in an ingredients list. Since there’s no strong record of benefit, no clear safety profile, and no large-scale testing, cautious consumers skip it.
I’ve spoken with several registered dietitians who urge people to stick with whole foods and established supplements with a background of clinical research. Nutrition tends to reward people who don’t chase fads. Unless you work directly with a licensed nutritionist or participate in a supervised clinical trial, dabbling in unproven amino acids doesn’t deliver any real upside.
Dietary supplement safety depends on transparency and independent testing. Researchers could explore AIB’s effects in controlled, peer-reviewed human studies. As with other non-standard amino acids, examining how much the body absorbs, breaks down, and excretes AIB matters just as much as short-term symptom tracking.
Nutrition labels could also improve. Listing the exact sources and amounts of each amino acid removes confusion and helps doctors, patients, and scientists track results or side effects. Giving people clear information supports informed decisions—one of the pillars of food safety.
Most of us do fine with regular protein from a varied diet. Until research proves otherwise, 2-aminoisobutyric acid remains one of those mysterious ingredients better left to the lab than the dinner table.
2-Aminoisobutyric acid might sound like one of those tongue-twisting chemicals best left to textbooks, but its structure teaches a great deal about the flavor, stability, and innovation possible in simple molecules. I’ve picked up a lot through years of digging into both lab work and studies, and this compound stands out because of its simplicity and hidden complexity.
This amino acid goes by the formula C4H9NO2. To most, it’s known as AIB or α-methylalanine. If you try to sketch it, you start with a backbone similar to other standard amino acids, yet you see a key divergence: AIB carries two methyl groups attached to the central carbon right alongside the amino group (NH2) and the carboxyl group (COOH). Lining out the atoms, you find a central carbon (the α-carbon) bearing the amino and carboxyl groups, with two methyl branches (–CH3). Those methyls clamp down on the backbone, making it more rigid than classic alanine or glycine.
I remember a time in graduate research where a fellow student struggled to make sense of how tiny substitutions on an amino acid chain could make or break a drug’s stability. AIB’s double methyl branching makes the residue bulkier, so it locks down flexibility. For a peptide chain, that’s game-changing. It encourages the chain to twist into tight helices. Peptides built around AIB have earned reputations for resisting breakdown—something that comes in handy for anyone designing drugs, artificial enzymes, or new antifungals.
That stubborn structure doesn’t come by accident. Peptide bonds involving AIB don’t flop around. This chemical stubbornness keeps certain therapeutics from being chewed up by enzymes too quickly in the digestive system. Drug designers lean on that resistance because shelf stability and predictable behavior inside the body can let a medicine reach its intended target before breaking down.
Folks in biochemistry often look for ways to fine-tune proteins without totally rebuilding them. Swapping in a molecule like 2-aminoisobutyric acid produces a huge effect with just a minor edit. Natural proteins don’t use AIB, but synthetic chemists insert it into peptide drugs or antifungal agents, helping those compounds last longer and do their jobs effectively. Decades of research point out that AIB-rich peptides handle tough environments with less risk of early destruction—fantastic news for antifungal compounds battling resilient infections.
Cosmetic chemists have dabbled in amino acid tweaks like this, hoping to craft peptides that resist breakdown in creams or serums. Food scientists, always looking to hold flavors, also study artificial peptides for new functional ingredients, banking on that AIB-based stability.
While labs already use AIB in peptide research, educational programs would do well to highlight such examples. Understanding why one small methyl group twists an entire molecular structure makes chemistry less theoretical and more practical—especially for future innovators in medicine, food, and materials science.
By looking closely at molecules like 2-aminoisobutyric acid, up-and-coming scientists can find inspiration to question, experiment, and invent. The power in that extra methyl group invites us all to look deeper at the ways structure influences function, pointing toward smarter solutions for plenty of real-world challenges.
2-Aminoisobutyric Acid looks simple on a chemical inventory sheet, but anyone who has spent time in a lab knows the real story starts when bottles arrive. Powders or crystals like this can lose their punch if left unprotected. I remember sorting shelves in a university storeroom—one misplaced jar and your team could lose weeks of work. Stability and safety aren’t just ideas in a safety manual. They matter on the ground, every day.
2-Aminoisobutyric Acid doesn’t crave attention, but it sure dislikes dampness. Pull off the lid in a humid room and the crystals get sticky fast. Keep the bottle exposed to air, and you risk introducing contaminants or slow changes in the powder’s makeup. I’ve seen labs store amino acids in everything from reused plastic jars to those sturdy amber glass bottles, but not all containers keep out water vapor and oxygen the same way.
Pick airtight, chemically resistant containers. Glass jars with screw-top lids and silicone liners just work. Polypropylene offers another strong option, especially in busy labs where glass gets dropped more often than anyone admits. Avoid soft plastics or makeshift caps, since loose-sealing containers won’t keep out moisture or fridge odors.
Room temperature sometimes seems easy, but ambient conditions change with the seasons and building quirks. Refrigeration slows down reactions that would spoil your amino acid, so I always reach for the cold storage area when possible. Somewhere around 2–8°C makes sense, based on experience and the data from peer-reviewed reference sources. Not every bench has that kind of fridge space, so if room temperature storage is your only option, pay extra attention to humidity and sun exposure.
I’ve seen old bottles with faded marker scribbles and no way to check the contents. Invest in clear, smudge-proof labels that won’t peel off in the fridge, and always note the date you opened the bottle. If a colleague mixes up a batch using an open jar from months ago, the results may not match your expectations. Labeling creates a chain of trust—one simple step that protects sample quality and lab reputation.
Large stock bottles look tempting, but if you’re opening them again and again, the contents are at risk. Splitting a bulk purchase into smaller working containers saves the main supply and cuts down on contamination. My old supervisor always practiced this, and product longevity improved noticeably for the team.
Unused or expired stock can cause more problems than it solves. Instead of letting an old jar linger, follow proper disposal rules for amino acid compounds. Local and institutional guidelines outline safe ways to get rid of chemical waste, which keeps everyone safe and avoids fines.
Research moves forward on small actions. Storing 2-Aminoisobutyric Acid the right way—tight containers, cool and dry spaces, clear labels—keeps experiments predictable and trusted. No one gets lasting results from unpredictable chemistry. Make storage a daily habit, not just a safety meeting talking point.
2-Aminoisobutyric Acid stands as a regular fixture in laboratories, playing an important role in research that nudges medicine, peptide synthesis, and even agricultural advancements. Pure chemicals like this one support reliable, reproducible experiments. Impurities, even at low levels, can easily disrupt sensitive chemical reactions or change how a compound acts in a biological assay.
Lab folks often throw around terms like "purity >99%" and think they’ve covered their bases. With 2-Aminoisobutyric Acid, purity measures how much of the sample is actually what it says it is. Common bench standards expect no less than 98%, though most respected suppliers push that figure closer to 99% or above. This purity mark comes from analytical techniques. High-performance liquid chromatography (HPLC) and nuclear magnetic resonance (NMR) aren’t just buzzwords here; those are the workhorses of chemical verification and catch even the tiniest phantom peaks—impurities that might change a whole reaction.
Color and appearance matter too. White or close-to-white crystals usually point to a cleaner sample. Anything off-color can shout contamination. I’ve seen projects derailed when a batch looked good on paper, but a simple sight test pointed toward trouble. Water content tells another story. For this acid, less than 0.5% water keeps the structure solid and storage conditions easy. Excess moisture tends to trickle in during storage or from poor handling, bringing degradation risks and inconsistent yields in repetitive experiments.
Heavy metals, including lead, arsenic, and cadmium, pose real threats even at low levels. The cut-off for these nasties usually sits below 10 parts per million (ppm), often less, so the acid stays fit for pharmaceutical or even food-related research. I often check that a supplier runs proper inductively coupled plasma mass spectrometry (ICP-MS) or atomic absorption spectroscopy for this. Without those, claims about "trace levels" end up meaningless.
Residual solvents creep in during synthesis. Methanol, ethanol, or tetrahydrofuran, for example, can hang around in tiny amounts. Industry standards like those from ICH Q3C talk about what levels feel safe—usually under 0.5% for most solvents. Failing to remove these leaves an acid batch at risk for toxicity or compromised experimental results.
2-Aminoisobutyric Acid comes as a racemic mixture or a single enantiomer, and differences matter. Chiral chromatography tells you what’s in your vial. Some reactions or therapies need a specific enantiomer to work. Skipping the check can mean the difference between a compound that heals and one that hinders.
Every bottle should include a certificate of analysis. This isn’t just a slip of paperwork; it’s insurance that your acid holds up to the most basic promise. Checking for bacterial endotoxins, especially if the product’s meant for a bio setting, means extra peace of mind, too. Suppliers who stand by their batch numbers and documentation make life in the lab a lot less stressful.
Start by choosing suppliers with a real history in chemical manufacturing—ISO certification talks louder than cheap prices ever could. Don’t skip the look-and-sniff test when the delivery arrives. Batch-to-batch consistency grows out of regular, documented quality control, not luck. Finally, always demand transparent methods on every report. In the long run, roping in third-party testing might cost more upfront, but nothing beats the confidence it brings to your results.
| Names | |
| Preferred IUPAC name | 2-Aminopropanoic acid |
| Other names |
Alpha-methylalanine 2-Methylalanine AIB 2-Aminoisobutanoic acid alpha-Methyl-2-aminopropionic acid |
| Pronunciation | /əˌmiːnoʊ.aɪˌsoʊˈbjuːtɪrɪk ˈæsɪd/ |
| Identifiers | |
| CAS Number | 62-57-7 |
| Beilstein Reference | 1719492 |
| ChEBI | CHEBI:17047 |
| ChEMBL | CHEMBL1377 |
| ChemSpider | 1076 |
| DrugBank | DB00139 |
| ECHA InfoCard | ECHA InfoCard: 100.003.487 |
| EC Number | 2.2.1.16 |
| Gmelin Reference | Gmelin Reference: 83438 |
| KEGG | C00283 |
| MeSH | D000880 |
| PubChem CID | 440799 |
| RTECS number | AE4200000 |
| UNII | VFD6KX65ZZ |
| UN number | UN3336 |
| CompTox Dashboard (EPA) | DTXSID3023502 |
| Properties | |
| Chemical formula | C4H9NO2 |
| Molar mass | 103.12 g/mol |
| Appearance | White crystalline powder. |
| Odor | Odorless |
| Density | 1.035 g/cm³ |
| Solubility in water | Soluble in water |
| log P | -2.8 |
| Acidity (pKa) | 2.41 |
| Basicity (pKb) | 10.24 |
| Magnetic susceptibility (χ) | -42.9·10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.4740 |
| Dipole moment | 3.07 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 143.6 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -298.2 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1054.8 kJ/mol |
| Pharmacology | |
| ATC code | A13AA04 |
| Hazards | |
| Main hazards | May cause respiratory irritation. May cause eye, skin, and respiratory tract irritation. |
| GHS labelling | GHS05, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | Hazard statements: No known significant effects or critical hazards. |
| Precautionary statements | P264; P270; P301+P312; P330; P501 |
| NFPA 704 (fire diamond) | 1-0-0 |
| Flash point | 190°C |
| Autoignition temperature | 570°C (1058°F) |
| Lethal dose or concentration | LD50 (oral, rat): 12,500 mg/kg |
| LD50 (median dose) | LD50 (median dose): 3,860 mg/kg (Oral, rat) |
| PEL (Permissible) | Not established |
| REL (Recommended) | 10 µM |
| IDLH (Immediate danger) | No IDLH established. |
| Related compounds | |
| Related compounds |
Aminoisobutyric acid (alpha-aminoisobutyric acid) GABA (gamma-aminobutyric acid) Beta-alanine Alanine Valine |
