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2 protocols using labchip gx touch software

1

IgG Antibody Purification and Glycan Analysis

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IgG antibodies were purified from plasma as described previously55 (link). In brief, total IgG was collected using the Melon Gel IgG Purification Kit (Thermo Fisher Scientific) according to the manufacturer’s protocol. Purified IgG samples were then centrifuged through 100-kDa Amicon Ultra Centrifugal Filters (Merck Millipore) at 14,000g for 15 min to remove excess serum proteins and buffer exchange antibodies into PBS. Purity was confirmed via SDS–polyacrylamide gel electrophoresis (Bio-Rad Laboratories) and IgG concentrations were measured using a NanoDrop spectrophotometer (Bio-Rad Laboratories). IgG N-linked glycosylation patterns were measured according to the ProfilerPro glycan profiling LabChip GXII Touch protocol on the LabChip GXII Touch HT Microchip-CE platform (PerkinElmer) using the LabChip GX Touch software (v.1.9.1010.0), as described previously55 (link). Microchip capillary electrophoresis laser-induced fluorescence analysis of digested and labeled N-linked glycans was performed. The relative prevalence of major N-linked glycan profiles of IgG was analyzed using the LabChip GX Reviewer (PerkinElmer) v.5.4.2222.0. Peaks were assigned based on the migration of known standards and glycan digests. The peak area and relative prevalence of each glycan pattern were calculated.
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2

Protein Denaturation Analysis by LabChip GXII

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Analysis of all samples was performed on the LabChip GXII touch HT (PerkinElmer) according to the manufacturer’s protocol. Briefly, denatured protein was prepared by mixing 2 μl protein sample (1 mg/ml) with 14 μl of the denaturation solution (Protein Express Sample Buffer) provided by the manufacturer in the presence of 23 mM iodoacetamide (Sigma) for nonreducing condition or 34 mM DTT (Thermo Scientific) for reducing condition. The mixture was heated at 75 °C for 5 min and the samples run under both reducing and nonreducing conditions. The denatured protein was electrokinetically loaded directly into the chip from a microtiter plate (Bio-Rad Laboratories). The experiment was run using LabChip GX touch software (PerkinElmer) and data were analyzed using LabChip GX Reviewer (PerkinElmer).
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