An amino acid panel quantifies each amino acid in your sample — in ours, 19 amino acids plus ammonia, each reported in concentration units like mg/L or µM. A free panel tells you what’s dissolved in the product as it exists; a total panel (after acid hydrolysis) tells you what the protein was made of. For a beverage or supplement label, it’s the free panel that answers the question.
An amino acid panel is twenty numbers where you used to have one. Instead of “protein: 5 g,” you get leucine, isoleucine, valine, glutamine, and sixteen companions — each quantified on its own, each traceable to a peak on a chromatogram. Here is what those numbers are, what they aren’t, and the three questions they actually answer.
The 20 numbers
Our AA-1 panel reports 19 proteinogenic amino acids — alanine, arginine, asparagine, aspartic acid, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine — plus ammonia, which tracks glutamine breakdown and fermentation activity. (Cysteine is excluded: it behaves anomalously under standard AQC conditions1 and gets its own reduction–alkylation workup, our AA-3.) Each analyte is quantified individually against calibration standards — twenty numbers, not one “protein” number.
Free vs total: the fork in the road
Two different preparations answer two different questions. A free panel measures the amino acids already unbound in the sample — what’s dissolved in the bottle. A total panel first boils the sample in strong acid to break proteins apart, then counts the pieces. Hydrolysis is destructive: tryptophan is destroyed outright, serine and threonine partially, and asparagine and glutamine are deamidated into aspartic and glutamic acid — so a hydrolyzed panel cannot tell you how much glutamine was in the original product.23 For a beverage or supplement label, the free panel is the honest number. (Longer version: free vs total amino acids.)
A worked example (illustrative numbers — not laboratory data)
Say your RTD declares 5 g of BCAAs per 500 mL serving — 10 g/L across leucine, isoleucine and valine. The panel comes back:
| Analyte | Label (per serving) | Measured (per serving) | Read |
|---|---|---|---|
| Leucine | 5.0 g BCAAs | 2.3 g | 4.65 g total — under a Class I bar4, worth investigating |
| Isoleucine | 5.0 g BCAAs | 1.15 g | |
| Valine | 5.0 g BCAAs | 1.2 g | |
| Glutamine | 2.0 g | 1.0 g | Half the formulated level… |
| Ammonia | — | elevated | …with ammonia up: the signature of glutamine breakdown in storage5 |
One run, three answers: the label check, the batch check, and the stability clue.
Reading the units
Panels report concentration: mg/L (mass) or µM (moles) per amino acid, sometimes mol% (share of the total). Convert before comparing — a label in grams per serving and a report in mg/L need the serving volume to meet. Below-LOQ results are flagged, not zeroed: “not detected” means “below what this method can see,” which is a precise statement, not a vague one. How to read an amino acid profile walks through the conversions.
Three questions a panel answers
- Is the label true? Measured vs declared, per amino acid.
- Is the batch consistent? Lot-to-lot comparison on the same panel.
- What’s changing? Panels over time give the degradation slope — the number that predicts shelf life (see how long amino acids last in drinks).
Wondering what your label is actually worth? Our $250 pilot covers 5 samples — one per company — and the full $250 credits against your first contract invoice if you sign within 90 days of the report. We’re validating our method on the Agilent 1100 now and reserving pilot slots ahead of our November 25 readiness target — request a quote to hold your place.
What a panel can’t tell you
Honest limits: a panel doesn’t identify the protein the amino acids came from, doesn’t measure bioavailability, and doesn’t screen for contaminants or adulterants outside the panel. It answers “how much of each amino acid” — precisely, with the chromatogram to prove it — and nothing else. That’s the deal.
Frequently asked questions
How is this different from a protein test (Kjeldahl/Dumas)?
Those measure total nitrogen and multiply by 6.25 — one number, blind to composition. A panel tells you which amino acids, how much each. Different questions.
Why 19 amino acids and not 20?
Cysteine is excluded from the standard panel because it behaves anomalously under routine AQC conditions1; it gets a dedicated reduction–alkylation workup (AA-3). Everything else proteinogenic is in.
What’s ammonia doing on an amino acid panel?
Ammonia is the breakdown product to watch: glutamine degrades into pyroglutamic acid plus ammonia5, and fermentation produces it. An elevated ammonia number next to a low glutamine number tells a story no single analyte could.
Can the panel detect amino spiking?
Yes — that’s one of its best uses. Spiking a product with cheap free amino acids to inflate apparent protein shows up as an abnormal profile: individual amino acids far out of proportion to any natural source. The panel sees the proportions, not just the total.
How often should I run it?
Every batch while you’re learning your variation; on a schedule once it’s stable; and across shelf life for the slope.
References
- A Closer Examination of 6-Aminoquinolyl-N-Hydroxysuccinimidyl Carbamate Amino Acid Derivatization in HPLC with Multiple Detection Modes — Sung Y-S., Berthod A., Roy D., Armstrong D.W. — Chromatographia, 2021. Cysteine behaves anomalously with AQC across detection modes.
- Hydrolysis method and limiting factors — Servicio de Química de Proteínas — acid hydrolysis converts asparagine and glutamine to aspartic and glutamic acid; tryptophan and cysteine are destroyed.
- Amino Acid Analysis and Chemical Sequencing — Jakubowski H. — LibreTexts Biochemistry: hydrolysis in 6N HCl destroys Trp; Gln and Asn side-chain amides hydrolyze to Glu and Asp.
- 21 CFR 101.9 — Nutrition labeling of food — U.S. Food and Drug Administration — §101.9(g): Class I nutrients (added) must test at or above the declared value in a composite sample.
- L-glutamine degradation rate in cell culture media at 37 °C — BenchChem Technical Support — glutamine degrades to ammonia and pyroglutamic acid, accelerated by heat and higher pH.
OpenChemWorks Laboratory · Reviewed by the laboratory director, PhD chemist · Published October 2, 2026