The collectors contained fibres of different compositions, each of which absorbed a unique range of volatile molecules such as organic acids, alcohols, amines and ketones.

收集器里配有不同成分的纤维，每种纤维所含的活性分子都各异，比如有机酸、醇、胺、甲酮等。

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Some years ago, Sheryl Barringer, a scientist at Ohio State University who studies how volatile molecules contribute to flavour, had a student ask her about doing a project on garlic breath.

几年前，一位学生就一项关于呼吸中存在的蒜味的研究请教俄亥俄州立大学教授谢里尔·巴林杰，一位研究挥发分子如何影响气味的科学家。

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"When we chew and swallow, volatile molecules from the food go through the rear of the nasal cavity to the olfactory receptors in the roof of the nose, " says Richard Doty, director of the University of Pennsylvania's Smell and Taste Center.

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The technique works by focusing high-powered microwaves on plant-based material, transforming the tough cellulose molecules of the plant matter into volatile gases.

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