A saffron quotation is easier to compare when three questions stay separate: what material is being supplied, what its reported quality measurements mean, and which substitutions the laboratory actually looked for. Research on saffron powders and filaments shows why one attractive result cannot close all three questions.[1][2]
For buyers, the useful conclusion is not “order every available test.” It is to match the evidence to the purchase: dried stigmas, milled stigmas or a processed extract, with any carrier explicitly declared. The framework below translates the research into questions for the supplier and laboratory.
Start with the material, not the largest number on the certificate
The two studies discussed here examined saffron stigmas, filaments and powders; neither established an authenticity method for every concentrated extract or finished formulation.[1][2] If the proposed purchase is an extract, ask the laboratory whether its sample preparation and interpretation have been validated for that extraction process and carrier. Do not silently transfer a powder result to an extract.
We recommend separating the purchasing brief into three decisions:
| Decision | Evidence to request | What it does not establish |
|---|---|---|
| Material identity | Botanical name, plant part, physical form, extraction history if applicable, and declared additions | That the material performs in a drink, capsule or other finished product |
| Composition or grade | Named method, reported analyte or optical measurement, units, calculation basis and batch-linked result | Absence of every possible substitute |
| Authenticity screening | Named targets, applicable matrix, detection capability and confirmation rule | Absence of untested materials or universal purity |
A carrier declared as part of an extract formulation is a different purchasing situation from undeclared substitution in a product sold as pure stigma powder. Agree on the contracted material before interpreting the report.
A failed grade is not automatically evidence of fraud
A 2022 multi-analytical study tested 21 saffron samples: nine powders and twelve filament samples, drawn from both commercial and private sources.[2] The investigators used UV-Vis spectroscopy, ATR-FTIR, microscopy with elemental analysis, and metal analysis on a selected subset.[2]
Thirteen samples were not assigned one of the three commercial categories by the study’s UV-Vis assessment; nine of those thirteen were excluded solely because the reported optical “odorous power” value fell outside the specified range.[2] That denominator matters: this was nine of thirteen unclassified samples, not nine proven adulterated samples.
The authors reported saffron-like FTIR fingerprints across the sample set, while microscopy still revealed floral contaminants in some powders.[2] These findings support a narrower reading than either “the grade proves authenticity” or “the grade failed, therefore the supplier cheated.” The measurements describe different features of the material. A broad fingerprint can support identification without ruling out every minor foreign component; a grading result can prompt investigation without identifying the cause.
For a purchasing dispute, our recommendation is to ask which individual parameter failed, how the laboratory prepared the sample, and what independent finding supports an identity or contamination concern. Keep a retained portion of the same lot for any agreed follow-up. Do not turn a single out-of-range optical value into a public allegation.
What the often-quoted “1% detection” actually means
A separate 2023 study developed a chemical-fingerprint approach using UHPLC-HRMS/MS. It examined 23 saffron stigma samples and seven saffron powders, alongside eight potential botanical adulterant species: safflower, calendula, turmeric, achiote, red pepper, mountain arnica, beet and pomegranate.[1] Pomegranate petals and seeds were examined separately, so a list of tested plant materials is not the same count as the list of species.[1]
The study extracted homogenized material using ethanol/water at 7:3 by volume, with sonication and centrifugation before analysis.[1] Its challenge mixtures contained each adulterant separately at 10%, 5%, 3% and 1% by weight; the mixtures were prepared in triplicate from pooled available saffron and adulterant samples.[1] These were controlled additions to saffron powder. The ethanol/water extraction was laboratory sample preparation, not a test of a manufactured extract ingredient.[1]
The authors reported that, at the 1% addition level, each investigated plant could be detected through at least three marker ions with a signal-to-noise ratio of at least 10:1.[1] That is useful experimental evidence, but it does not mean “this test certifies 99% purity.” It also does not establish the same capability for a carrier-containing extract, an untested adulterant or a different laboratory method.
There is another important distinction inside the paper. For evaluating unknown samples, the authors proposed classifying a sample as adulterated when more than 80% of one adulterant’s markers were detected; they explicitly based that threshold on the Pareto principle.[1] The 80% refers to the share of that adulterant’s markers detected, not its mass fraction in saffron. Detecting at least three ions at the lowest tested addition does not by itself establish that this classification rule was met. A laboratory quoting this research should explain which endpoint its own report uses and how that decision rule performs in the material being purchased.
The authors’ internal spectral database contained 82 markers, including the saffron and adulterant marker set; it was not a panel of 82 adulterant species.[1] In the seven Czech-market powder samples evaluated, saffron markers were present and none of the monitored adulterant markers were detected.[1] This small, local negative result cannot establish the prevalence of adulteration in another market—or establish that every possible substitute was absent.
Turn “authenticity tested” into a defined scope
For procurement, we would treat the test report as a bounded answer. A useful report should make it possible to finish this sentence:
In this identified lot and material form, the laboratory examined these specified targets with this method, using these criteria, and obtained this result.
The 2023 study illustrates why naming the targets matters: its experimental panel did not include every botanical mentioned in the paper’s background discussion.[1] In particular, gardenia appeared in the literature review but was not one of the eight species tested in the new experiments.[1] A citation to that paper alone should not be accepted as evidence that a supplier’s report excludes gardenia.
We recommend asking the laboratory to distinguish screening signals from confirmed findings, describe any inconclusive outcome, and identify where additional reference material or another method is needed. A negative result should retain its scope: “not detected for the targets tested,” rather than an unsupported universal statement of purity.
Three practical purchasing situations
A filament lot has an unexpected grading result. Request the individual measurements and examine the reason for the classification before rejecting the material as fraudulent. The 2022 study is a concrete example of disagreement between an optical classification and other observations, not permission to ignore an agreed contract specification.[2]
A powder supplier offers a certificate saying only “authenticity: passes.” Ask for the screened botanical targets, sample preparation, confirmation rule and applicable detection capability. The 2023 experiment demonstrates a defined eight-species challenge panel, rather than a universal authenticity guarantee.[1]
An extract supplier cites a spice-powder study. Ask for evidence that the method applies to the actual extract, including its carrier and processing history. The studies reviewed here do not validate that application.[1][2] Resolve method applicability before acceptance; the evidence gap alone does not show that the extract is defective.
Keep identity and formulation approval separate
Once the material and its evidence are agreed, formulation approval still needs its own project-specific criteria. Our recommendation is to compare the candidate sample in the intended base and process, defining the colour, aroma, taste, dispersion and stability outcomes that matter for that product. Do not infer those outcomes from an authenticity result.
For an enquiry, send the intended material form, target application, destination market, any restrictions on carriers, and the analytical question you need answered. Ask for batch-linked documents and a representative sample before comparing prices on apparently similar specifications. Confirm supply and destination-market requirements for the specific project.
Scope: This article interprets two analytical studies for procurement; it does not report our own supplier-lot testing. The numerical results apply to the study conditions, not a validated purchasing specification. For a contractual ISO requirement, confirm the applicable edition and test scope with the laboratory.
Sources
[1] Detection of botanical adulterants in saffron powder
[2] Determination of Saffron Quality through a Multi-Analytical Approach