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Long-term stability studies on stored glycerol monostearate (GMS)-effects of relative humidity

  • Technical
  • Published:
Journal of the American Oil Chemists’ Society

Abstract

The long-term hydrolysis and isomerizations that occurred in commercial glycerol monostearate (GMS) have been studied under controlled low relative humidity (ca. 30%) and high relative humidity (ca. 90–100%). Acid number values increased 2–3 units over an 84-day period in high relative humidity, and only 0.5 unit in low humidity.

Changes in the totalα-monoglyceride,β-monoglyceride,α,α′-andα,β-diglyceride concentrations with time offered a method to observe the processes involved. Changes in monoglyceride and diglyceride concentrations of GMS were monitored using the BSTFA [(N,O)-bis(trimethylsilyl)trifluoroacetamide] derivative and fused silica capillary gas chromatography. Isomerization was shown to occur before any substantial hydrolysis. Decreases in concentration ofα,β orα,α′-diglyceride (after isomerization was essentially complete) corresponded to the acid number rises observed.

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Authors and Affiliations

  1. Humko Chemical Division of Witco Corp., P.O. Box 125, 38101, Memphis, TN

    S. James Robbins & Sherry H. Nicholson

Authors
  1. S. James Robbins
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  2. Sherry H. Nicholson
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Robbins, S.J., Nicholson, S.H. Long-term stability studies on stored glycerol monostearate (GMS)-effects of relative humidity. J Am Oil Chem Soc 64, 120–123 (1987). https://doi.org/10.1007/BF02546265

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  • DOI: https://doi.org/10.1007/BF02546265

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