Green tea extract assay projects need method, marker and COA alignment before supplier comparison.
Green Tea Extract HPLC vs UV Assay Specification Guide
This guide helps B2B sourcing, QA and formulation teams review green tea extract HPLC vs UV assay specification questions. The Green Tea Extract product page remains the main RFQ page for sample, COA, packing, MOQ and quotation. This support page focuses on assay method, marker selection, result format and document review.
Assay wording can change the entire quote. A buyer requesting catechins by HPLC may need a different document trail from a buyer requesting broad tea polyphenols by UV. The RFQ should state the method, target marker, expected result format and application before samples are compared.
Assay Specification Fields to Confirm
| Field | What to confirm | Buyer note |
|---|---|---|
| Assay method | HPLC, UV or buyer-specified method. | State the method before comparing COA values. |
| Target marker | Catechins, EGCG, tea polyphenols or buyer-defined marker. | Marker choice defines the suitable grade. |
| Result format | Percentage, range, batch value, dry basis or another buyer format. | Keep result language consistent across suppliers. |
| COA fields | Batch number, method note, result values and specification limits. | Links sample approval with commercial batch review. |
| Physical parameters | Appearance, particle size, moisture, flowability and packing notes. | Supports capsule, powder blend and beverage testing. |
| Commercial fit | Sample quantity, MOQ, lead time, packing size and destination market. | Aligns QA review with purchasing planning. |
HPLC vs UV for Green Tea Extract Sourcing
| Dimension | HPLC assay request | UV assay request |
|---|---|---|
| Main buyer question | Which specific marker and batch value are documented? | Which broad marker group and method language are required? |
| Best fit | Catechin, EGCG or marker-specific purchasing briefs. | Broad tea polyphenols or buyer-defined general extract briefs. |
| Related page | Catechins COA specification guide. | Tea polyphenols specification guide. |
| Buyer action | Ask for method, marker, specification range and representative COA. | Ask for method language, result format and batch COA fields. |
Sample and COA Review Workflow
- State the target method: HPLC, UV or buyer-defined method.
- Define the marker: catechins, EGCG, tea polyphenols or another specification line.
- Request a representative COA before comparing sample prices.
- Test the sample in the actual capsule, powder blend, beverage or food matrix.
- Keep sample label, method note, COA and quotation assumptions together for repeat orders.
RFQ Checklist for Green Tea Extract Assay Review
- Assay method and marker target.
- Expected result format and specification range.
- Application format: capsule, tablet, powder blend, beverage or functional food.
- Caffeine direction and physical requirements if relevant.
- Required documents: specification, COA, packing information and questionnaire.
- Sample quantity, destination market, MOQ expectation and annual volume.
Assay Decision
Define the Method Before Comparing Green Tea Extract COA Values
Use the Green Tea Extract supplier page for RFQ. If the marker is EGCG 98%, route the request to the EGCG HPLC COA guide.
FAQ: Green Tea Extract HPLC vs UV Assay
HPLC is typically used when a buyer needs marker-specific review, while UV may appear in broader polyphenol specification conversations. The RFQ should state the required method.
Do not compare them as identical values unless the buyer quality team has defined a clear method bridge. Ask for method, marker and result format before supplier comparison.
Use the Green Tea Extract product page for quotation and this guide for assay-method questions.
If the brief names high-purity EGCG or EGCG 98%, use the EGCG guide separately from a broad green tea extract assay request.
Request Green Tea Extract Assay Documents
To request green tea extract samples for HPLC or UV assay review, share the target method, marker, result format, application, document list, sample quantity, packing preference and annual volume. Contact HERBSEA for COA, specification, sample and quotation details.