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Determination of Crude Fat in Food Products by Supercritical Fluid Extraction and Gravimetric Analysis

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Nicholas H. Snow , Maureen Dunn and Sohita Patel

Seton Hall Univeristy, Department of Chemistry, South Orange, NJ 07079-2694

J. Chem. Educ., 1997, 74 (9), p 1108

DOI: 10.1021/ed074p1108

Publication Date (Web): September 1, 1997

Section:

History, Education, and Documentation

Abstract

The use of supercritical fluid extraction (SFE), a recently developed analytical extraction method, in the undergraduate instrumental analysis laboratory is demonstrated. Specifically, the extraction and gravimetric analysis of the fats from a common commercial confection was performed by several groups of undergraduates, and the extraction recoveries were evaluated. The percentage of fat by weight in the candy bar sample was determined to be 21 +/- 2 %, a value found to be in agreement with the product labeling. Under the extraction conditions used, complete extraction required 400-700 mL of supercritical carbon dioxide, applied to a 1.0 g sample of candy in several extraction steps. Data relating extraction recovery to the volume of carbon dioxide used for extraction is shown. SFE is shown to be a versatile addition to the undergraduate instrumental analysis laboratory, requiring a minimum of training and supervision. Finally, SFE can be extended to myriad physical and analytical measurements in the undergraduate laboratories. Examples derived from the current analytical literature are proposed.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Environmental Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

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