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. 2019 Aug 2;24(15):2824. doi: 10.3390/molecules24152824

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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GC-MS analysis of volatile compounds from the milk samples: (a) Comparison of amounts and types of volatile compounds from milk extracted by four types of solid-phase microextraction (SPME) fiber (100 μm polydimethylsiloxane (PDMS), 50/30 μm DVB/CAR/PDMS, 65 μm PDMS/divinylbenzene (PDMS/DVB), and 75 μm carboxen/PDMS (CAR/PDMS); all from Supelco Inc., Bellefonte, PA, USA). Means within a group followed by different letters (a–c) are different (p < 0.05). (b) Total ion currency (TIC) profile of the volatiles from three kinds of skim milk samples.