New chemiluminescence assay for linamarin

Area of Science:

• Analytical Chemistry
• Biochemistry
• Food Science

Background:

• Linamarin is a toxic cyanogenic glucoside found in cassava, necessitating accurate quantification methods.
• Existing spectrophotometric methods for linamarin determination have limitations in sensitivity.
• Development of sensitive and specific assays is crucial for food safety and quality control of cassava products.

Purpose of the Study:

• To develop and validate a new, highly sensitive chemiluminescence assay for the quantitative determination of linamarin.
• To compare the sensitivity of the new assay with the conventional spectrophotometric method.
• To identify potential interfering substances in the chemiluminescence assay.

Main Methods:

• Enzymatic hydrolysis of linamarin using linamarase to release glucose.
• Quantification of released glucose using a chemiluminescence system (glucose oxidase-peroxidase-luminol).
• Comparison of the chemiluminescence assay with a spectrophotometric method using cassava extracts.

Main Results:

• The developed chemiluminescence assay demonstrated significantly higher sensitivity for linamarin quantification compared to the spectrophotometric method.
• Specific ions interfered with the assay: Vanadate, Mg2+, and Cu2+ inhibited luminescence, while EDTA and EGTA activated it.
• Hg2+ inhibited glucose oxidase activity, and Tris ions inhibited linamarase activity, both interfering with the assay's accuracy.

Conclusions:

• The novel chemiluminescence assay provides a more sensitive and efficient method for linamarin determination in cassava.
• Understanding and mitigating the effects of interfering ions is essential for the reliable application of this assay.
• This assay holds potential for improved monitoring of linamarin levels in cassava processing and consumption.