1. Start with application fit

The Big Endothelin1 Fragment 2238 Human CAS 124932612 product page describes Big Endothelin-1 Fragment (22-38) (human), CAS NO. 124932-61-2, as a synthetic peptide designed as a substrate analog for the endothelin-converting enzyme (ECE). It mimics the natural C-terminal region of the Big ET-1 precursor. According to the description, research uses include:

• Studying the enzymatic cleavage that converts Big ET-1 into active Endothelin-1 (ET-1)
• Validating ECE activity, with the fragment used as a reference standard
• Screening for potential ECE inhibitors
• Cardiovascular pathophysiology research involving hypertension, pulmonary arterial hypertension, heart failure and endothelial dysfunction

When this product may not fit: This fragment is a biochemical research tool. If your project needs a different peptide sequence, the full-length precursor or mature ET-1, this fragment is not a substitute.

2. Check the listed specifications

Compare these values with your protocol:

• Purity: ≥98% by RP-HPLC is the stated level. If your assay needs a tighter threshold or a different analytical method, ask for it in writing.
• Endotoxin: the listed limit of ≤1 EU/mg matters for sensitive in vitro and ex vivo work. The supplier describes the product as suitable for these applications. Check that the limit meets your own requirement.
• Solubility: make sure one of the listed solvents (1M acetic acid, DMSO or deionized water) works with your assay buffer system.
• Storage: confirm that you can keep the material at -20°C, protected from light and moisture, when it arrives.
• MOQ: the listed minimum order is 1 g. Plan your purchase quantity around this.

3. Request batch documentation

The product page states that each batch includes a COA, an HPLC purity report and MS chromatograms. It also states that every batch is tested with mass spectrometry and HPLC. When you request a quote, ask for these documents for the specific lot you will receive. Check that the reported purity, identity data and molecular weight match the listed specifications.

4. Verify quality-system and logistics statements

The supplier's page includes several statements that you should confirm in writing for your own compliance records:

• GMP: the page says the product is made in GMP-compliant systems. Ask what documentation backs this up and whether it meets your regulatory needs.
• Regulatory support: the page mentions provision of DMF/FDA certified source materials. Ask which documents are available for this particular product.
• Shipping and stock: the page mentions USA warehouse stock and cold chain packaging for international air freight. Availability, lead time and shipping conditions can change. Confirm them for your destination and order date. Buyers outside the USA, for example in Europe, the Middle East or Southeast Asia, should ask about the shipping route and packaging that apply to them.

This guide makes no promises about pricing, lead times or certifications. Get these details directly from Global Technology Co., Ltd. with your quotation.

5. Quick selection checklist

1. Your study needs an ECE substrate analog matching Big ET-1 fragment 22-38 (human).
2. ≥98% RP-HPLC purity and ≤1 EU/mg endotoxin meet your acceptance criteria.
3. One of the listed solvents works with your assay.
4. You can store the material at -20°C away from light and moisture.
5. A 1 g MOQ suits your planned quantity.
6. You have asked for a lot-specific COA, HPLC report and MS data.
7. You have confirmed GMP, regulatory documents, stock and shipping in writing.

If every item checks out, request a quotation for Big Endothelin1 Fragment 2238 Human CAS 124932612 with your required quantity, destination and documentation list.