Non-polar solvents dissolve the elastomeric polymers that make chewing gum sticky.
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CONTESTED
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The sources discuss elastomer-solvent thermodynamic affinity and the extraction of components from chewing gum using solvents, but do not directly show that non-polar solvents dissolve the elastomeric polymers that make chewing gum sticky.
The aim of the study was to determine whether it is possible to correlate directly the barrier properties of elastomer materials assessed on the basis of the breakthrough time tp with the thermodynamic a nity of the elastomer solvent system, characterized by their solubility parameters δ. According to EN ISO 6529:2001 standard, breakthrough time is de ned as the time elapsing from the moment that the tested material sample gets in contact with the chemical to the moment in that a speci ed amount of the substance appears on the other side of the sample. Cured butyl rubber (IIR) in the form of at membranes were tested in the study. For the nonpolar rubber polar or rubber nonpolar solvent systems it has been found that signi cant di erences in rubber and solvent solubility parameters not in every case leads to better resistance to permeation. The properties of the permeating chemical and the rubber, including its polarity, shape, and molecule dimension of the solvent, are of considerable importance. A marked disparity of breakthrough times were observed for the permeation of polar or nonpolar solvents despite similar values of their solvent solubility parameter. The breakthrough time of the solvent from the homologous series (pentane, hexane and heptane) is determined not only by the rubber and solvent solubility parameters but by the size of the chemical molecule as well. Therefore, for the assessment of material barrier properties the thermodynamic a nity or dissimilarity of the elastomer and the permeating solvent is only semiquantitative in character.
In this study, a simple and rapid method was developed for the determination of BHT (2,6-di-t-butyl-p-hydroxytoluene) and BHA (t-butyl-4-hydroxyanisole) in chewing gum using solvent extraction combined with gas chromatography. The results showed that among seven types of extraction solvent, diethyl ether was the best, as chewing gum dissolved and dispersed in diethyl ether, gave the highest yield of BHT and BHA from chewing gum. Recovery studies were performed on chewing gum, spiked with both BHT and BHA at 100~200µg/g each. The recoveries of both BHT and BHA were 99~101% (CV: 1.5~3.2%) and 94~99% (CV: 7.1~8.6), respectively. The coefficients of variation were less than 8.6%. Fifteen chewing gum samples were analyzed by the current method. Both the BHT and BHA contents were found to be 0~296 µg/g and 0~133 µg/g, respectively. After chewing for 15 min, 70% of the total soluble compounds and 50% of BHT and BHA were released from chewing gum.
"Effects of extraction solvent on gas chromatographic quantitation of B" by H.-J. Lin, M.-L. Wang et al. --> Skip to main content Home About Articles & Issues My Account Home > JOURNAL > Vol. 11 (2003) > Iss. 2 Effects of extraction solvent on gas chromatographic quantitation of BHT and BHA in chewing gum Authors H.-J. Lin M.-L. Wang Y.-M. Choong C.-W. Chen B.-S. Hwang S.-L. Tsai L.-C. Chung M.-H. Yang Abstract In this study, a simple and rapid method was developed for the determination of BHT (2,6-di-t-butyl-p-hydroxytoluene) and BHA (t-butyl-4-hydroxyanisole) in chewing gum using solvent extraction combined with gas chromatography.
The results showed that among seven types of extraction solvent, diethyl ether was the best, as chewing gum dissolved and dispersed in diethyl ether, gave the highest yield of BHT and BHA from chewing gum. Recovery studies were performed on chewing gum, spiked with both BHT and BHA at 100-200μg/g each. The recoveries of both BHT and BHA were 99-101% (CV: 1.5-3.2%) and 94-99% (CV: 7.1-8.6), respectively. The coefficients of variation were less than 8.6%. Fifteen chewing gum samples were analyzed by the current method. Both the BHT and BHA contents were found to be 0-296 μg/g and 0-133 μg/g, respectively.
After chewing for 15 min, 70% of the total soluble compounds and 50% of BHT and BHA were released from chewing gum. Recommended Citation Lin, H.-J.; Wang, M.-L.; Choong, Y.-M.; Chen, C.-W.; Hwang, B.-S.; Tsai, S.-L.; Chung, L.-C.; and Yang, M.-H. (2003) "Effects of extraction solvent on gas chromatographic quantitation of BHT and BHA in chewing gum," Journal of Food and Drug Analysis : Vol. 11 : Iss. 2 , Article 4.
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