Open a sea buckthorn analytical report and one name keeps appearing alongside quercetin: isorhamnetin — quercetin carrying a single methyl group at its 3′-hydroxyl. That one methyl turns a common flavonol into a distinct molecule with its own retention time, its own glycoside family and its own supply chain.
This article explains what isorhamnetin is, how it relates to quercetin, why the methylated fraction is a source-fingerprint for sea buckthorn extracts, and how Hunan Noksoul Biological Technology Co., Ltd. (brand: VistaExtract) controls the process behind a ≥98% aglycone. The company's products are exported in volume to Europe, the United States, Japan and Southeast Asia.
Isorhamnetin is a methylated flavonol aglycone: the quercetin skeleton with a methoxy group at the 3′-position of the B ring. Molecular weight 314.29 versus quercetin's 302.24 — one CH₂ apart, yet the difference is enough to change polarity, HPLC retention and metabolic behavior. In plants, O-methyltransferases convert part of the quercetin fraction into isorhamnetin, which then appears as glycosides such as narcissoside (isorhamnetin 3-O-rutinoside).
Kaempferol vs. quercetin vs. isorhamnetin. The three flavonols differ by single substituents: kaempferol lacks quercetin's 3′-OH; isorhamnetin has that position methylated instead. A clean HPLC method must resolve all three — a "total flavonols" number hides exactly the ratios a buyer needs to see.
The richest commercial sources of isorhamnetin glycosides are sea buckthorn berry and leaf (Hippophae rhamnoides), with ginkgo leaf extract, perilla, allium and calendula as additional botanical carriers. Each source carries a different isorhamnetin-to-quercetin ratio — effectively a fingerprint of origin, harvest and processing.
Producing ≥98% isorhamnetin is a separation problem first and a chemistry problem second. Sea buckthorn extracts arrive carrying quercetin, kaempferol and a spread of glycosides alongside the target molecule. Three failure modes dominate:
Hunan Noksoul Biological Technology Co., Ltd. produces isorhamnetin through six documented gates: botanical identification and flavonol profiling of incoming sea buckthorn lots, food-grade ethanol extraction under temperature control, low-temperature vacuum concentration, column chromatography to separate isorhamnetin from quercetin and related flavonols, low-temperature recrystallization, and batch release testing. Each gate has a documented owner, a written parameter window and a release record; where a supplier most easily fails quietly, the process runs at deliberately conservative settings.
Isorhamnetin sits in the wellness mainstream. As a standardized botanical flavonol, it is configured across dietary supplements, cosmetics and skincare, cardio-positioned nutrition, functional food and beverage, pharmaceutical research, and adjacent uses such as oral care and traditional-medicine-adjacent formulations. These reflect general industry configuration of the ingredient, not claims about any finished product.
VistaExtract isorhamnetin is shipped in commercial volumes to Europe, the United States, Japan and Southeast Asia, with Korea an active adjacent market for flavonol-rich botanical extracts. COA, MSDS and the compliance statement set travel with every shipment.
Every batch is released against a defined panel: identity (HPLC retention and UV spectrum), assay ≥98% by HPLC with quercetin resolved as a separate peak, related flavonols and glycoside residues, residual solvent, water content, heavy metals and microbiology. Statements covering non-irradiation, non-GMO status, absence of TSE/BSE risk and absence of ethylene oxide accompany the goods.
| Item | Specification |
|---|---|
| Product name | Isorhamnetin |
| CAS No. | 480-19-3 |
| Molecular formula / weight | C₁₆H₁₂O₇ / 314.29 |
| Assay | ≥98% (HPLC) |
| Typical source | Hippophae rhamnoides (sea buckthorn) berry / leaf |
| Appearance | Yellow to orange-yellow crystalline powder |
| Minimum order | 1 kg (samples 10–20 g available) |
| Packaging | 1 kg aluminum-foil bag / 25 kg fiber drum |
| Compliance statements | Non-irradiated, non-GMO, TSE/BSE free, no ETO; ISO / Kosher / Halal-managed production |
Hunan Noksoul Biological Technology Co., Ltd. (VistaExtract) is a botanical extract manufacturer based in Huaihua, Hunan, China. The company operates a comprehensive extraction workshop of approximately 4,200 m² with a 1,700 m² laboratory, and runs integrated lines covering multiple botanical actives. Its products are exported in volume to Europe, the United States, Japan and Southeast Asia.
This article is provided for business and technical-information purposes. Statements about industries and research directions describe general configuration of the ingredient by sector and are not claims of therapeutic effect for any product. Structure and process descriptions are simplified for orientation. Images marked "AI-assisted illustrative image" are generated for illustration and do not depict specific facilities.
