DL-Alanine
Compiled from published pharmacological and botanical literature. Not independently verified by Herbuno. Spotted an error or have a correction? Flag it below →
| Compound | DL-Alanine (racemic alanine) |
|---|---|
| Chemical class | Racemic mixture of D- and L-alanine — simplest chiral amino acid |
| CAS | 302-72-7 (DL-) · 56-41-7 (L-) · 338-69-2 (D-) · 107-95-9 (beta-alanine) |
| Molecular weight | 89.09 g/mol |
| Primary application | Sweetness and taste modification — perception is not stereospecific |
| Nutritional basis | D-alanine is inert in humans — the racemate is ~half usable |
| Claim strength | High for the sensory application; not appropriate for nutritional use |
| Buy from Herbuno | DL-Alanine 98% Powder · L-Alanine 99% Powder |
| Origin | Processed / Sourced from India |
| MOQ | R&D 100 g / 250 g (subject to stock) · Pilot batch 1–5 kg · Bulk 10 kg, 25 kg and above |
| Lead Time | Dispatch within 72 hrs from stock · fresh-batch production (typically 50 kg+): 10 working days |
| Documentation | CoA & MSDS standard with every lot |
Name origin: Adolph Strecker coined "alanine" in 1850 after synthesising it from acetaldehyde, ammonia and hydrogen cyanide — the Strecker synthesis, which is inherently non-stereoselective and yields the racemate. DL-alanine is therefore the original synthetic article, and the L-form was the one isolated later from protein.
The naming problem, twice over: Two confusions attach to this material. DL-alanine is not L-alanine, delivering roughly half the nutritionally usable material. More seriously, neither is beta-alanine, which is 3-aminopropanoic acid rather than 2-aminopropanoic acid, non-proteinogenic, achiral, and the rate-limiting carnosine precursor behind the pre-workout category. Three distinct CAS numbers, three distinct articles, and three distinct price points.
Why the racemate is traded: Because its principal application is sensory rather than nutritional. Alanine is distinctly sweet, and sweetness perception is not stereospecific in the way nutrition is — D-alanine is itself sweet, so the racemate performs comparably to the L-form as a taste modifier at lower cost. DL-alanine has a long record in Japanese food manufacture as a sweetness contributor and taste-rounding agent, particularly in pickles, vinegared products and seasoning blends.
D-alanine's own biology: D-alanine is not biologically inert everywhere, only in human nutrition. It is a structural component of bacterial peptidoglycan, where the terminal D-alanyl-D-alanine of the pentapeptide is the cross-linking substrate and the binding target of vancomycin. Bacteria possess alanine racemase to produce it, and that enzyme is an antibacterial drug target precisely because the pathway has no human counterpart.
Evidence for DL-Alanine Applications
Taste modification is the legitimate application and the one the racemate is genuinely suited to. Alanine is distinctly sweet in both enantiomeric forms, so for sensory purposes the racemate performs comparably to the L-form at lower cost. In a bitter category — and amino acid and electrolyte powders are among the most bitter formats in nutrition — a sweet amino acid that contributes palatability without an added sweetener is a clean-label advantage. DL-alanine has a long industrial record in Japanese food manufacture in exactly this role. Claim strength: High.
For nutritional purposes the racemate is simply half-strength, and should not be specified. D-alanine is not converted to L-alanine in humans to any useful extent — unlike D-methionine, which converts efficiently — so DL-alanine delivers roughly half the nutritionally usable material of an equivalent weight of L-. Where an amino acid profile is being met, or where alanine is included for the glucose-alanine cycle rationale, the L-form is required and the racemate is a false economy. Claim strength: High.
The beta-alanine confusion is the most commercially consequential risk here. Beta-alanine is 3-aminopropanoic acid, CAS 107-95-9, non-proteinogenic, achiral, and the rate-limiting precursor of muscle carnosine — its evidence base covers carnosine loading over four to ten weeks and improved high-intensity exercise capacity in the 60 to 240 second domain. Neither L-alanine nor DL-alanine has any carnosine-loading role. Beta-alanine commands a substantially higher price and all three are white crystalline powders, so the substitution incentive runs one way and visual inspection catches nothing. Claim strength: High.
The analytical distinction is straightforward once it is being looked for. Beta-alanine is achiral and shows no optical rotation; L-alanine shows a specific rotation characteristic of the L-form; DL-alanine is racemic and also shows no net rotation. So optical rotation separates L-alanine from the other two but does not distinguish DL-alanine from beta-alanine — that requires chromatography or a chiral method with a D-alanine determination. For incoming beta-alanine lots the combination is worth running as standard. Claim strength: High.
D-alanine has real biology, which is worth knowing even though it is not nutritional. D-alanine forms the terminal D-alanyl-D-alanine of bacterial peptidoglycan pentapeptide, the cross-linking substrate and the binding target of vancomycin, and bacterial alanine racemase is an antibacterial drug target because the pathway has no human equivalent. This is why D-alanine appears in microbiological media and research rather than in nutrition, and it is a factual point rather than a product claim in either direction. Claim strength: High.
There is no supplementation evidence for alanine in any isomeric form. Alanine is non-essential, readily synthesised from pyruvate by alanine aminotransferase, and abundant in dietary protein, so availability is not a constraint in anyone eating adequately. No controlled trial has shown supplemental alanine, L- or DL-, improves performance, recovery, glycaemic control or body composition. The commercial basis for either form is sensory, excipient or profile-completion use. Claim strength: Emerging, and effectively absent.
Sourcing DL-alanine from Herbuno. We supply DL-alanine at 98%, L-alanine at 99% and beta-alanine as three separate articles.
Specify by CAS number. DL-alanine at 302-72-7, L-alanine at 56-41-7 and beta-alanine at 107-95-9 are routinely conflated in enquiries, they differ substantially in price, and all three are white crystalline powders. Take DL-alanine for sweetness and taste modification, where the racemate performs comparably at lower cost. Take L-alanine for anything nutritional, since D-alanine is not usefully converted in humans. All lots ship with CoA and MSDS; request a quotation for pilot or bulk volumes.
Dosage & Formulator Specification
DL-alanine is dosed as the free amino acid at 98%, with no salt conversion. For sensory use the inclusion is determined by sensory evaluation rather than by a physiological target, typically in the range of a few tenths of a percent to a few percent of the formula depending on the matrix and the sweetness contribution wanted. There is no nutritional dose for the racemate, because for nutritional purposes the L-form should be specified instead.
The isomer decision here is application-driven, which is unusual in this catalogue. For taste modification the racemate is appropriate and economical, because sweetness perception is not stereospecific and D-alanine is itself sweet. For any nutritional purpose — meeting an amino acid profile, parenteral formulation, the glucose-alanine cycle rationale — the L-form is required, since D-alanine is not usefully converted in humans. State the form against the intended function on the purchase specification, because a standard assay will not distinguish them.
Handling is easy. DL-alanine is freely soluble in water at around 16 grams per 100 millilitres at room temperature, stable to heat and across a broad pH range, and only mildly hygroscopic. It flows well as a crystalline powder, blends uniformly and is compatible with common excipients. Its sweetness is clean rather than lingering, and it contributes a rounding or mouthfeel effect alongside the sweetness that is part of its value in seasoning applications.
Thermal behaviour is worth planning for in sensory applications. The amino group participates in Maillard reactions with reducing sugars, and alanine-derived Strecker degradation products contribute characteristic caramel and nutty notes in thermally processed products. In a baked or roasted format this may be exactly what is wanted, and alanine is sometimes used for that reason rather than for sweetness alone; in a format where browning is undesirable it is a constraint. Decide which before the process is locked, and evaluate on finished goods rather than on the premix.
For analytical control, specify the compound by CAS number alongside the name, and require optical rotation. The limitation of optical rotation here is worth understanding: it separates L-alanine, which shows a characteristic specific rotation, from both DL-alanine and beta-alanine, which show no net rotation — the racemate because its enantiomers cancel, beta-alanine because it is achiral. Distinguishing DL-alanine from beta-alanine therefore requires chromatography or a chiral method with a D-alanine determination. Standard coverage includes heavy metals, residual solvents, microbiological limits, loss on drying and sulphated ash.
On incoming inspection, the risk to design around is beta-alanine substitution rather than anything specific to the racemate. Beta-alanine commands a substantially higher price than either alanine form, all three are white crystalline powders of similar appearance, and the economic incentive therefore runs one way. For any incoming beta-alanine lot, run optical rotation plus a chromatographic identity check rather than relying on the certificate: the rotation alone will not separate beta-alanine from DL-alanine, which is precisely the substitution a cost-driven supplier would make. The same applies in reverse when buying DL-alanine, where there is no economic motive for substitution but a labelling error is still possible.
Two positioning points are worth settling with a customer before they commit to artwork. First, there is no supplementation evidence for alanine in any isomeric form: it is non-essential, readily synthesised from pyruvate by alanine aminotransferase, and abundant in dietary protein, so availability is not a constraint in anyone eating adequately, and no controlled trial has shown supplemental alanine improves performance, recovery, glycaemic control or body composition. A product positioned on the glucose-alanine cycle is describing real biochemistry and inferring an outcome the literature does not support. Second, where DL-alanine is included as a taste modifier rather than a nutrient, saying so in the technical documentation is better than letting the ingredient list imply a functional role it does not have — a sweet amino acid that reduces the masking-agent load is a legitimate clean-label argument on its own terms, and does not need a physiological story attached.
One clinical note causes recurring confusion and is quick to resolve. Alanine aminotransferase is the enzyme reported as ALT on liver function panels, and the shared name occasionally prompts questions about whether supplemental alanine affects liver markers. It does not: ALT is measured as an indicator of hepatocellular injury, the assay quantifies enzyme activity rather than the amino acid, and dietary or supplemental alanine has no bearing on the result. The same applies to aspartate aminotransferase and L-aspartic acid. Both are worth a line in customer-facing documentation for any product carrying either amino acid at gram scale, since the question tends to come from consumers rather than from formulators.
Frequently Asked Questions — DL-Alanine
When should I use DL-alanine rather than L-alanine?
For taste modification. Alanine is distinctly sweet in both enantiomeric forms and sweetness perception is not stereospecific, so the racemate performs comparably at lower cost. It has a long record in Japanese food manufacture in pickles, vinegared products and seasoning blends. For anything nutritional, use the L-form.
Why not use it nutritionally?
D-alanine is not converted to L-alanine in humans to any useful extent — unlike D-methionine, which converts efficiently — so the racemate delivers roughly half the usable material. Where you are meeting an amino acid profile or formulating parenterally, it is a false economy.
Is this related to beta-alanine?
No, and this is the expensive confusion. Beta-alanine is 3-aminopropanoic acid, CAS 107-95-9, non-proteinogenic and achiral, and the rate-limiting carnosine precursor behind the pre-workout category. Neither L-alanine nor DL-alanine has any carnosine-loading role. Three CAS numbers, three articles, three price points.
How do I tell them apart analytically?
Optical rotation separates L-alanine, which shows a characteristic specific rotation, from both DL-alanine and beta-alanine, which show no net rotation — the racemate because its enantiomers cancel, beta-alanine because it is achiral. Distinguishing those two needs chromatography or a chiral method with a D-alanine determination.
Does D-alanine do anything at all?
In bacteria, a great deal. D-alanine forms the terminal D-alanyl-D-alanine of peptidoglycan pentapeptide — the cross-linking substrate and the binding target of vancomycin — and bacterial alanine racemase is an antibacterial drug target because the pathway has no human counterpart. That is why it appears in microbiological media rather than nutrition.
Will it brown in my product?
Yes, with heat and reducing sugars. Alanine-derived Strecker degradation products contribute caramel and nutty notes, and alanine is sometimes specified for that effect rather than for sweetness. In a baked or roasted format that may be the point; elsewhere it is a constraint. Evaluate on finished goods, not the premix.