Magainin II is supplied as white lyophilized powder with molecular formula C114H180N30O29S and molecular weight 2465.9. Magainin II is the more potent member of the magainin family and is one of the most extensively cited membrane-active antimicrobial peptides in the literature. Researchers apply it to gram-negative and gram-positive susceptibility testing, outer membrane permeabilization studies and synergy experiments with beta-lactam antibiotics. Its well-documented helical structure makes it a standard model in biophysical work on peptide-lipid interactions, including surface plasmon resonance and calorimetry measurements. In drug discovery it serves as a benchmark for new cationic peptide designs and as a control in assays evaluating resistance emergence under repeated exposure. YIWU SHUNXIAN TRADING CO., LTD. is a professional supplier of high-purity research-grade peptides and laboratory consumables dedicated to supporting biochemical and life-science research teams worldwide. We combine qualified peptide raw-material resources with a stable international logistics network, giving researchers and industry partners a dependable source for laboratory development projects. Every product line is handled with documented quality control, from purification through lyophilization and final release, and each shipment is packed to protect the material during transit. Our team works closely with customers on specification selection, packing format and delivery scheduling, and we regard responsive technical communication as part of the product itself rather than an optional extra. Release testing combines chromatographic purity, mass confirmation and counterion analysis. The HPLC method uses a C18 column and a water-acetonitrile gradient containing trifluoroacetic acid, and system suitability is checked before each sequence. Peptide-related impurities above the reporting threshold are listed in the lot record. Because different assays tolerate different levels of residual salt, the counterion profile is documented separately so that a laboratory can decide whether an additional desalting step is appropriate for its application. Packaging is configured around laboratory handling practice: amber vials to limit photodegradation, butyl stoppers for a reliable seal, and clear lot identification on both the vial and the outer carton. Sizes start at small trial quantities suitable for method development and extend to multi-gram amounts for screening campaigns. On request we can supply barcoded labels so that vials can be logged directly into an electronic inventory system without manual transcription. Enquiries about pricing, analytical documentation and shipping can be sent to Aurora by WhatsApp on +852 4423 6619, or by email to 18963519387@163.com. When writing, include the product, the quantity required and the country of destination; if the material is intended for a time-sensitive study, mention the required date so that an appropriate service level can be proposed. Storage practice depends on how the material will be used. For a series of experiments spread over several months, keep the sealed vial at minus 20 degrees Celsius and withdraw only the quantity needed for each session. If the whole vial will be consumed within one week, reconstitute once, filter if the assay requires sterility, and hold the solution at 2 to 8 degrees Celsius protected from light. Do not store reconstituted peptide at room temperature for extended periods. We ship worldwide through established courier partners and provide a tracking number once the parcel leaves the warehouse. For multi-item orders, goods are consolidated into a single shipment to lower the per-product freight contribution. If a laboratory needs material by a specific date for a scheduled experiment, we can advise on the practical transit window for the destination and select the service level that matches that deadline.