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    Ingredient guide · Ingredient reference

    Tris-glycine gels: stacking and protein separation do different jobs

    Tris-glycine electrophoresis uses a buffer system to organize migration through a gel. Under SDS-PAGE conditions, proteins are separated mainly by size; native conditions require a different interpretation.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    The buffer system first concentrates the sample

    In the discontinuous system, chloride and glycine provide leading and trailing ion behavior that helps focus proteins into a narrow starting region. Tris supplies buffering and counterions. [1]

    This stacking step improves the starting arrangement for separation. It is not itself a measurement of protein nutritional quality. [1]

    SDS changes what migration mainly represents

    SDS masks much of the proteins’ intrinsic charge and gives a broadly similar charge-to-mass relationship. Migration through the gel then depends primarily on size, allowing molecular-weight estimates against suitable standards. [1]

    Without SDS, native protein charge and shape also matter. A band position cannot be interpreted using SDS-PAGE assumptions merely because the gel uses Tris and glycine. [1]

    Identify conditions before interpreting a band

    Imagine two proteins migrate differently in a native gel. That observation alone does not prove the faster protein has a lower molecular weight.

    Key distinctions — Tris-glycine gels
    DetailInterpretation
    StackingConcentrates the starting zone
    SDS-PAGEMainly size-based separation
    Native gelCharge and shape also matter
    Tris-glycine gels: stacking and protein separation do different jobs — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. electrophoresis-biorad
      Source consulted: 2026-09-18. This is a reference resource, not a claim that we conducted the studies or tested a product.