Plasma beta-N-acetylhexosaminidase isoenzyme composition and temperature conversion factors

Area of Science:

• Biochemistry
• Enzymology
• Clinical Chemistry

Background:

• Plasma beta-N-acetylhexosaminidase (Hex) activity determination is crucial for diagnosing certain genetic disorders.
• Existing methods for isoenzyme analysis can be time-consuming and expensive.
• Accurate and efficient methods for quantifying Hex isoenzyme composition are needed.

Purpose of the Study:

• To investigate the correlation between temperature conversion factors (TCF) and the proportion of Hex B isoenzyme.
• To evaluate the utility of TCF calculations for rapid and cost-effective Hex isoenzyme determination.

Main Methods:

• Utilized the chromogenic substrate 3,3'-dichlorophenylsulfonphthaleinyl-N-acetyl-beta-D-glucosaminide for plasma Hex activity assays.
• Calculated TCF at different temperature ratios (37°C/25°C and 37°C/30°C).
• Correlated TCF values with the relative proportion of Hex B isoenzyme.

Main Results:

• A highly significant positive correlation (P<0.001) was observed between TCF and the Hex B isoenzyme proportion.
• TCF calculated using 37°C/25°C provided results comparable to a previously described activation energy method.
• TCF calculated using 37°C/30°C did not meet the required analytical demands.

Conclusions:

• TCF, particularly at the 37°C/25°C ratio, offers a rapid and economical approach to determine plasma Hex isoenzyme composition.
• This method provides a valuable alternative for clinical laboratories seeking efficient diagnostic tools.
• Further validation may be needed for TCF calculations at other temperature ratios, such as 37°C/30°C.