Glycated hemoglobin (HbA1c) plays a crucial role in diabetes management, offering an accurate long-term measure of blood glucose control over 2-3 months. As the global demand for accurate and cost-effective HbA1c testing grows, Hzymes, a domestic leader in HbA1c reagent development, is pioneering new solutions to meet these needs. This article explores the advancements made by Hzymes in the field of HbA1c testing, their approach to reagent development, and the challenges they have overcome to deliver precise, cost-efficient solutions for laboratories worldwide.

The Importance of HbA1c in Diabetes Management

HbA1c is a stable compound formed when glucose in the blood binds to the N-terminal valine of the hemoglobin β chain through a slow, irreversible, non-enzymatic process. Unlike blood glucose levels, which fluctuate with meals and daily activity, HbA1c reflects the average blood glucose concentration over a period of 2-3 months. This makes HbA1c a key indicator for monitoring long-term blood glucose control in diabetes patients.

Since 2010, an HbA1c level of ≥ 6.5% has been recognized as the diagnostic criterion for diabetes. Consequently, accurate HbA1c measurement is essential for diabetes diagnosis and management, particularly in distinguishing between stable and fluctuating blood glucose levels.

Common Methods for HbA1c Testing

There are three primary methods for measuring HbA1c:

1.High-Performance Liquid Chromatography (HPLC): 

Often considered the gold standard for HbA1c testing, HPLC is known for its high sensitivity, reproducibility, and specificity. According to the 2023 national external quality assessment results, about 70% of users rely on HPLC for HbA1c measurement.

2.Immunoassays: 

A more affordable option, immunoassays are becoming increasingly popular, making up 15% of the HbA1c testing market.

3.Enzymatic Methods: 

While still gaining traction, enzymatic methods are recognized for their cost-effectiveness and simplicity, offering an attractive alternative for routine testing.

Each method comes with its advantages, but with significant price reductions in testing services, alternative methods like immunoassays and enzymatic tests are gaining momentum in global markets, especially in regions like China where prices are being standardized.

Hzymes’ Innovative Approach to HbA1c Testing

Hzymes has revolutionized the field of HbA1c testing with its enzymatic reagent solutions, which promise both affordability and precision. As the first domestic company to independently develop HbA1c reagents, Hzymes’ enzymatic method is designed to be highly accurate while keeping production costs low.

The Enzymatic HbA1c Method

The enzymatic HbA1c testing method developed by Hzymes is a two-stage process. In the first stage, a protease cleaves the glycated dipeptide from the N-terminal of the hemoglobin β chain. The absorbance at a specific wavelength is then measured to calculate the hemoglobin concentration. In the second stage, fructosyl peptide oxidase (FPOX) interacts with the glycated dipeptide, producing hydrogen peroxide, which is subsequently detected by peroxidase in the presence of DA-67, a novel chromogen. This reaction leads to a measurable color change, which is used to calculate the HbA1c percentage.

Overcoming Technical Challenges

Developing enzymatic HbA1c reagents involves overcoming several technical challenges:

1.Protease Selection: 

Ensuring specific cleavage of the glycated dipeptide from the hemoglobin β chain is crucial for accurate measurements.

2.Stable FPOX Development: 

FPOX is the core enzyme in the reaction. Its stability and sensitivity are critical to the overall performance of the assay.

3.Color System Optimization: 

Minimizing interference from co-existing substances such as lipids and bilirubin is essential for accurate readings.

Through extensive research and development, Hzymes has addressed these challenges, achieving significant breakthroughs in reagent stability and sensitivity.

Breakthroughs in Reagent Performance

Hzymes has made impressive strides in enhancing the stability of its reagents. Using semi-rational design, Hzymes created a mutation library of FPOX and identified several stability-enhancing sites. One key mutation resulted in an FPOX variant with over 4000 times greater thermal stability compared to the wild type. This innovation has led to a reagent with ten times the stability of previous formulations.

Additionally, Hzymes introduced DA-67, a novel chromogen that significantly improves the sensitivity and specificity of HbA1c detection. By modifying the chromogen’s chemical structure, Hzymes has created a version that reduces interference from substances like bilirubin, lipids, and uric acid, making it more accurate than imported alternatives.

The Future of HbA1c Testing with Hzymes

Hzymes continues to set the standard for HbA1c testing with reagents that meet international standards for precision and reliability. The company’s dual-channel enzyme-based reagent aligns with global HbA1c standardization programs such as the IFCC and NGSP. This ensures the reagent’s reliability even when testing for hemoglobin variants, offering a robust solution for worldwide diabetes monitoring.

Moreover, Hzymes has innovated by developing animal-derived calibrators, which avoid the biosafety risks associated with human blood-based calibrators. These calibrators are low-cost, easy to obtain, and suitable for mass production, helping circumvent the regulatory challenges of human-derived products.

Conclusion

Hzymes is at the forefront of innovation in HbA1c testing, offering cost-effective, accurate, and stable solutions that are transforming the diabetes monitoring landscape. With advancements in enzyme technology, reagent stability, and chromogen development, Hzymes has positioned itself as a leader in the field. As global demand for reliable and affordable HbA1c testing continues to rise, Hzymes’ commitment to excellence in research and development promises to shape the future of diabetes care.