A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering

作者：Kim Uihan; Song Jaewoo; Ryu Suho; Kim Soocheol; Joo Chulmin^*

来源：Jove-Journal of Visualized Experiments, 2016, (118): e55006.

DOI：10.3791/55006

• Bioengineering
• Issue 118
• erythrocytes
• hemoglobin
• hemoglobin concentration
• photothermal effect
• refractive index
• point of care testing

Photo-thermal angular light scattering (PT-AS) is a novel optical method for measuring the hemoglobin concentration ([Hb]) of blood samples. On the basis of the intrinsic photothermal response of hemoglobin molecules, the sensor enables high-sensitivity, chemical-free measurement of [Hb]. [Hb] detection capability with a limit of 0.12 g/dl over the range of 0.35 - 17.9 g/dl has been demonstrated previously. The method can be readily implemented using inexpensive consumer electronic devices such as a laser pointer and a webcam. The use of a micro-capillary tube as a blood container also enables the hemoglobin assay with a nanoliter-scale blood volume and a low operating cost. Here, detailed instructions for the PT-AS optical setup and signal processing procedures are presented. Experimental protocols and representative results for blood samples in anemic conditions ([Hb] = 5.3, 7.5, and 9.9 g/dl) are also provided, and the measurements are compared with those from a hematology analyzer. Its simplicity in implementation and operation should enable its wide adoption in clinical laboratories and resource-limited settings.

• 出版日期2016-12