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Luna 5u

Manufactured by Phenomenex
Sourced in United States

The Luna 5u is a high-performance liquid chromatography (HPLC) column designed for analytical separations. It features a 5 micron particle size and is packed with a proprietary stationary phase material. The Luna 5u column provides efficient and reproducible separations of a wide range of analytes.

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3 protocols using luna 5u

1

Analytical and Preparative RP-HPLC Peptide Purification

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Analytical RP-HPLC was carried out using a C18 column (Phenomenex, Luna 5u, 4.6mm X 250mm). The peptide samples were eluted from the column by employing a linear gradient of solvent B (5–90% B in 130 min; solvent B, 80% acetonitrile in water containing 0.1% aqueous TFA; solvent A, 0.1% TFA; flow rate: 1 ml/min). Preparative RP-HPLC (LC-8A Shimadzu Preparative Liquid Chromatograph) was used for large-scale purification of peptides using a preparative column (Phenomenex preparatory C18 column, Luna 10 μ, 30 mm X 250 mm). The chromatography was carried out using the same solvent gradient system as above but at a flow rate of 30 ml/min.
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2

Purification and Characterization of Antioxidant Peptides

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The protein fraction obtained by gel filtration chromatography with the highest NO radical scavenging activity (F2) was further fractionated by RP-HPLC using a C18 column (250 mm×4.6 mm, Luna 5U; Phenomenex, Torrance, CA, USA). The peptides were eluted at room temperature using a gradient (0–100% mobile phase B for 20 min) of mobile phase A (0.1%, V/V, trifluoroacetic acid; TFA) and B (70%, V/V, ACN in 0.05%, V/V, TFA) at a flow rate of 0.7 mL/min. Chromatographic analyses were performed using the ChromQuest software (Thermo Fisher Scientific Inc., Waltham, MA, USA) (22 (link)). Peptides were detected by measuring the absorbance at A280 nm, the principal subfractions (F2-1 to F2-5) were isolated and collected, and the NO radical scavenging activity of three aliquots was determined while the rest was lyophilized.
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3

Optimized LC-MS Protocol for Compound Analysis

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Liquid chromatography–mass spectrometry (LC-MS) was measured on a Bruker Daltonik GmbH, Germany, equipped with diode array detector (Agilent Technologies), Agilent 1100 binary pump and Autosampler (Agilent). The electrospray ionization positive mass spectra were acquired using a micrOTOF series mass spectrometer. Conditions, optimized using flow injection of standard and sample solutions, were as follows: electrospray ionization capillary voltage, 4.5 kV; end plate offset voltage, −500 V; nebulizer pressure, 2 bar; dry gas flow, 6 L/min; dry gas temperature 180 °C; source detector voltage 1,600 V; and TOF detector voltage 2,190 V. The electrospray ionization gas was nitrogen. All TOF measurements were performed at high resolution and the TOF analyzer was scanned at m/z 50–1,000 with a 1-s integration time. A flow rate of 0.4 mL/min was used for the analytical column C-8 (2), Phenomenex, Luna 5u, 150×4.6 mm. HPLC grade water and acetonitrile both containing 0.1 % formic acid were used as the mobile phase with a 15-min elution time.
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