Banaba: botanical (leaf).
Banaba testing at Vanguard Laboratory: identity, purity and quantity $250 per sample, with results in 3 to 5 business days.
Marker compound: 2D structure drawn from the PubChem record (CID 6918774).
Lagerstroemia speciosa Leaf
corosolic acid
total or named markers, as your specification states
Botanical (leaf)
Marker compounds: corosolic acid (CAS 4547-24-4)
Method for the $250 identity, purity and quantity test: HPLC-UV marker-compound assay (corosolic acid), LC-MS identity, against a reference standard, with results in 3 to 5 business days.
The USP Herbal Medicines Compendium monograph covers identity by HPTLC fingerprint and content of corosolic acid by HPLC. Full testing to the USP Herbal Medicines Compendium monograph for Lagerstroemia speciosa Leaf is available and quoted.
$250
Chromatographic purity and mg per unit by the method matched to the compound, identity against a reference standard. 1 unit.
| Add-on test | Price |
|---|---|
| Identity and impurities | |
| FTIR identity | $90 |
| CHNS elemental analysis (carbon, hydrogen, nitrogen, sulfur) | $125 |
| Chiral purity (where a chiral method exists; new methods quoted) | $250 |
| Water, solvents and salt form | |
| Water content by Karl Fischer | $60 |
| Residual solvents | $150 |
| Counterions: chloride, acetate and TFA | $70 |
| Assay | |
| Assay, % w/w (with raw powder purity; $250 together) | +$50 |
| Metals and conformity | |
| Heavy metals: arsenic, cadmium, chromium, mercury and lead | $150 |
| Conformity: purity and quantity on more units from the same lot | $100 per extra unit |
10% off for 10 or more samples.
Need something else? Other tests are available on request.
Purity and quantity is $250 per sample (1 unit) and raw powder purity is $200 for 50 mg, with results in 3 to 5 business days. Send the material sealed and labeled, with the label claim and the form it contains.
No. The $250 test covers identity, purity and quantity by HPLC-UV measurement of corosolic acid, with LC-MS identity. Full testing to the USP Herbal Medicines Compendium monograph for Lagerstroemia speciosa Leaf is available and quoted.
Corosolic acid is a triterpene acid and the monograph's content marker for banaba leaf. It absorbs UV only weakly, so it is detected at a low wavelength and confirmed by LC-MS.
Corosolic acid has close isomers such as maslinic acid that can elute nearby. Chromatographic separation and mass spectrometry are used to keep them apart.
The monograph lists Terminalia cuneata as a potential confounding material.
https://pubchem.ncbi.nlm.nih.gov/compound/6918774
Identity facts from the USP monograph header for this compound.
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