Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 91:766-769 (1989)
© 1989 American Society of Plant Biologists

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Environmental and Stress Physiology

Osmotic Pressure of Aqueous Polyethylene Glycols 1

Relationship between Molecular Weight and Vapor Pressure Deficit

Nicholas P. Money2

Division of Molecular and Cellular Biology, National Jewish Center, Denver, Colorado 80206

Osmotic pressures (II) of aqueous solutions of polyethylene glycols (PEGs) of average relative molecular weight (Mr) between 200 and 10,000 were measured using vapor pressure deficit osmometry. The relationships between molarity and II were described with high precision by second order polynomials for each of the PEGs studied. In contrast to previous reports, equivalent weights of different polymers in solution did not generate the same II; low Mr PEGs generated a higher II than the higher Mr PEGs. The effect of PEGs upon II represents an interaction between concentration and Mr.

2 Present Address: Department of Biochemistry, Colorado State University, Fort Collins, CO 80523.

1 This research was supported in part by grant DCB 86-18694 from the Developmental Biology Program of the National Science Foundation (to F. M. Harold).




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