Paper diagnostic for instantaneous blood typing

Area of Science:

• Colloids Chemistry
• Immunology
• Biophysics

Background:

• Blood transport on paper differs between agglutinated and stable blood.
• Understanding these differences can lead to new instantaneous blood typing methods.

Purpose of the Study:

• To investigate the fluidic properties of agglutinated versus stable blood on paper.
• To develop rapid, single-step blood typing tests utilizing antibody-antigen interactions.

Main Methods:

• Two experimental series involving mixing blood with specific/nonspecific antibodies.
• Analysis of wicking kinetics and red blood cell separation on filter paper.
• Investigation of three prototype devices for single-step blood typing.

Main Results:

• Agglutinated blood undergoes phase separation on paper, with red blood cells forming a distinct spot and plasma wicking.
• Stable blood suspensions exhibit uniform wicking.
• Agglutination by immunoglobulin M antibodies increases blood viscosity, controlling transport kinetics.

Conclusions:

• Blood agglutination and its transport on paper are governed by colloid chemistry principles.
• Specific antibody-antigen interactions triggering agglutination can be used for rapid blood typing.
• The developed methods show promise for instantaneous, single-step blood typing.