Towards ultrasensitive malaria diagnosis using surface enhanced Raman spectroscopy

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Parasitology

Background:

• Malaria diagnosis relies on detecting Plasmodium parasites or their byproducts.
• Hemozoin, a malaria pigment, is a potential biomarker for malaria detection.
• Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection.

Purpose of the Study:

• To develop and compare two SERS-based methods for hemozoin detection in human blood.
• To evaluate the suitability of each method for malaria quantification and early diagnosis.

Main Methods:

• Method 1: Synthesized silver nanoparticles mixed with lysed blood from malaria-infected individuals.
• Method 2: Synthesized silver nanoparticles directly within Plasmodium falciparum parasites in lysed blood.
• Utilized SERS to detect and quantify hemozoin in both methods.

Main Results:

• Method 1 demonstrated lower SERS measurement variability and a stronger correlation between hemozoin contribution and parasitemia.
• Method 2 exhibited higher sensitivity for detecting low parasitemia levels.
• The first method is preferred for accurate parasitemia quantification.

Conclusions:

• Both SERS methods show promise for malaria detection.
• Method 1 is suitable for quantifying malaria parasitemia.
• Method 2 is advantageous for early malaria diagnosis due to its high sensitivity to low parasite loads.