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Measurements of Soil Water Potential and Conductivity based on a Simple Evaporation Experiment using a Hydraulic Property Analyzer

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PERFORMANCE OF THE HEPP MICRO-OSMOMETER.

E Peters¹, G Saslow

¹Boston Lying-In Hospital, The Department of Obstetrics, The Harvard Medical School, and the Department of Physiology, The Harvard School of Public Health, Boston.

The Journal of General Physiology

|October 30, 2009

Summary

This summary is machine-generated.

The Hepp osmometer accurately estimates horse serum albumin molecular weight, comparable to Adair

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Area of Science:

Biochemistry
Physical Chemistry

Background:

Accurate molecular weight determination is crucial for understanding protein function.
Osmotic pressure measurements are a standard method for estimating molecular weight.

Purpose of the Study:

To evaluate the Hepp osmometer for determining the molecular weight of horse serum albumin.
To compare the Hepp osmometer's performance with the Adair osmometer.

Main Methods:

Osmotic pressure measurements of horse serum albumin solutions.
Concentration range: 0.713 to 5.12 gm. per 100 cc.
Comparison with Adair osmometer values.

Main Results:

The Hepp osmometer provided molecular weight values consistent with the Adair osmometer.
Accuracy and precision decreased below 0.7 gm/100 cc albumin concentration.
Duplicate determinations were completed in under 2 hours.
The instrument demonstrated ease of operation.

Conclusions:

The Hepp osmometer is a reliable and efficient instrument for estimating horse serum albumin molecular weight.
The instrument is suitable for routine laboratory use.
Limitations regarding accuracy at low concentrations were noted.