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J Agric Food Chem

Title:		GCMS investigation of volatile compounds in green coffee affected by potato taste defect and the Antestia bug
Author(s):		Jackels SC; Marshall EE; Omaiye AG; Gianan RL; Lee FT; Jackels CF;
Address:		"Chemistry Department, Seattle University , 901 12th Avenue, Seattle, Washington 98122-1090, United States"
Journal Title:		J Agric Food Chem
Year:		2014
Volume:		20141013
Issue:		42
Page Number:		10222 - 10229
DOI:		10.1021/jf5034416
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"Potato taste defect (PTD) is a flavor defect in East African coffee associated with Antestiopsis orbitalis feeding and 3-isopropyl-2-methoxypyrazine (IPMP) in the coffee. To elucidate the manifestation of PTD, surface and interior volatile compounds of PTD and non-PTD green coffees were sampled by headspace solid phase microextraction and analyzed by gas chromatography mass spectrometry. Principal component analysis of the chromatographic data revealed a profile of surface volatiles distinguishing PTD from non-PTD coffees dominated by tridecane, dodecane, and tetradecane. While not detected in surface volatiles, IPMP was found in interior volatiles of PTD coffee. Desiccated antestia bugs were analyzed by GCMS, revealing that the three most prevalent volatiles were tridecane, dodecane, and tetradecane, as was found in the surface profile PTD coffee. Coffee having visible insect damage exhibited both a PTD surface volatile profile and IPMP in interior volatiles, supporting the hypothesis linking antestia bug feeding activity with PTD profile compounds on the surface and IPMP in the interior of the beans"
Keywords:		Animals Coffea/*chemistry/parasitology Coffee/chemistry Fabaceae/*chemistry/parasitology Feeding Behavior Gas Chromatography-Mass Spectrometry Heteroptera/chemistry/*physiology Humans Taste Volatile Organic Compounds/*chemistry 2-isopropyl-3-methoxypyrazi;
Notes:		"MedlineJackels, Susan C Marshall, Eric E Omaiye, Angelica G Gianan, Robert L Lee, Fabrice T Jackels, Charles F eng Research Support, Non-U.S. Gov't 2014/10/07 J Agric Food Chem. 2014 Oct 22; 62(42):10222-9. doi: 10.1021/jf5034416. Epub 2014 Oct 13"