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[A modified microanthrone method for the determination of inulin on nanogram scale]
Sheng Li Xue Bao : [Acta Physiologica Sinica]
|February 1, 1992
Summary
This study presents a reliable microanthrone method for quantifying nanogram levels of inulin, crucial for kidney micropuncture research. The enhanced technique accurately measures inulin in tubular fluid, aiding in glomerular filtration rate determination.
Area of Science:
- Nephrology
- Analytical Chemistry
- Biochemistry
Context:
- Accurate measurement of inulin is vital for kidney research using micropuncture techniques.
- Classical methods require modification for nanogram-scale detection in small sample volumes.
Purpose:
- To establish a sensitive and reliable method for determining minute amounts of inulin on a nanogram scale.
- To adapt the microanthrone method for use with microliter volumes of tubular fluid.
Summary:
- A modified microanthrone method utilizing a spectrophotometer with a specialized microcuvette was developed.
- The method demonstrates a linear relationship between inulin concentration and absorption for 2-32 nl inulin per 10 microliters anthrone reagent.
- Inulin recovery rates averaged 101.2 +/- 3.5%, and tubular fluid did not interfere with the assay.
Impact:
- This method is suitable for direct application in kidney micropuncture studies.
- It enables accurate measurement of single nephron glomerular filtration rate (SNGFR).
- The mean SNGFR in rats was measured at 34.9 +/- 1.8 nl/min, consistent with literature values.