Protein molecular weights in their native state (in full homogeneity) were investigated using analytical size exclusion-HPLC with a TSK column (TSK G3000SWXL, Tosoh Bioscience) and Agilent 1200 Series HPLC System (Agilent Technologies). Protein samples run in 0.1 M Phosphate (pH 7.8), 0.2 M NaCl in a maximum of 100 μL sample/injection (equivalent to 1 mg/mL) were analysed at a flow rate of 0.8 mL/min (≤70 bar), at 25 °C. A 10 μL BioRad Gel filtration standard (Bio-Rad Laboratories), was applied for determining apparent molecular weight of target proteins from a standard curve of proteins of known size.
Tsk g3000swxl
The TSK G3000SWXL is a size exclusion chromatography column used for the analysis of macromolecules such as proteins, polymers, and other high molecular weight compounds. It is designed to separate molecules based on their size and molecular weight. The column features a silica-based stationary phase and is suitable for aqueous and organic mobile phases.
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8 protocols using tsk g3000swxl
Protein Expression and Purification Analysis
Protein molecular weights in their native state (in full homogeneity) were investigated using analytical size exclusion-HPLC with a TSK column (TSK G3000SWXL, Tosoh Bioscience) and Agilent 1200 Series HPLC System (Agilent Technologies). Protein samples run in 0.1 M Phosphate (pH 7.8), 0.2 M NaCl in a maximum of 100 μL sample/injection (equivalent to 1 mg/mL) were analysed at a flow rate of 0.8 mL/min (≤70 bar), at 25 °C. A 10 μL BioRad Gel filtration standard (Bio-Rad Laboratories), was applied for determining apparent molecular weight of target proteins from a standard curve of proteins of known size.
Molecular Weight Determination of Heparin by HPLC-GPC
Quantifying ATP Binding to TDnaK Mutants
TDnaK and its mutants (10 mg·ml−1) were incubated with 3 mM ATP at 55 °C for 60 min. The mixture was centrifuged for 1 min at 21,000 g. An aliquot (100 μl) was loaded on the HPLC gel filtration column TSK G-3000SWXL (Tosoh) equilibrated with 50 mM MOPS-NaOH (pH 7.5), 150 mM KCl, and 5 mM MgCl2 at room temperature. The eluted TDnaKs were concentrated to approximately 1.7 mg·ml−1 by using a 30 K Amicon ultra device. The absorption spectra of these solutions were measured using a V-650 spectrophotometer (JASCO). From the difference spectrum between the spectrum of the same proteins with or without ATP incubation, the amounts of bound ATP were calculated using the extinction coefficient of ATP (ε259 nm = 15,400 M−1 cm−1).
Carbodiimide-Mediated Synthesis of PEGylated Biomaterials
Precursor Binding Affinities of SecB Variants
Analytical Size-Exclusion HPLC of Proteins
Heparin Hydrolysates Characterization by SEC-MALS
Hydrolysates of heparin were separated on TSK G4000 SWXL and TSK G3000 SWXL columns (Tosoh Bioscience, Tokyo, Japan), protected by similarly packed guard column and eluted with a 0.1 M NH4OAc + 0.05% (w/v) NaN3 mobile phase at a flow rate of 0.6 mL/min and temperature of 30 °C. Samples were detected using MALS (DAWN 8+) and refractive index (Optilab T-REX) detectors (Wyatt Technology Corporation, Santa Barbara, USA). Data for molecular weight determinations were analyzed using Astra software v. 6.1.5 (Wyatt Technology Corporation, Santa Barbara, USA). Refractive index increments (dn/dc) of 0.131 mL/g for heparin 42 (link) and 0.185 mL/g for BSA 43 were used respectively in data processing.
Pullulan Characterization by GPC-RI
The I(λex 339 nm)/I(λex 334 nm) intensity ratios were plotted as a function of the logarithm of the polymer concentration (logC). The CMC was determined from the intersection point of the resulting two curves.
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