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Analysis of volatile profiles of green Hawai'ian coffee beans damaged by the coffee berry borer ( Hypothenemus hampei )
Author(s) -
Walker Hannah E,
Lehman Katherine A,
Wall Marisa M,
Siderhurst Matthew S
Publication year - 2018
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9393
Subject(s) - green coffee , berry , hexanal , coffee bean , coffea arabica , horticulture , flavor , pest analysis , food science , chemistry , botany , biology
BACKGROUND The coffee berry borer (CBB), Hypothenemus hampei , is the most destructive insect pest of coffee globally, causing significant losses in yield and leading to ‘off’ flavors in damaged beans. Automated headspace sampling (AHS) and gas chromatography–mass spectrometry (GC–MS) were used to investigate changes in the volatile profiles of CBB‐damaged green coffee beans. Green coffee from three coffee farms on the island of Hawai'i were sorted into three levels of CBB damage: non‐damaged, slightly damaged (1–2 pinholes/bean), and heavily damaged (> 2 pinholes/bean). RESULTS Distinct differences were found between green coffee bean samples based on the amounts of eight prominent volatiles. The amount of CBB damage was particularly correlated with the amount of both hexanal and 2‐pentylfuran. Principal component analysis showed clustering of non‐damaged green beans, which did not overlap with the slightly or heavily damaged clusters. Good separation was also found between a mixture of 50% slightly damaged and non‐damaged coffee. However, 20% slightly damaged and non‐damaged coffee clusters showed strong overlap. CONCLUSION Understanding the effects of CBB damage on coffee flavor profiles is critical to quality control for this valuable agricultural product. The results of this study show that the volatile profiles of green coffee beans vary with CBB damage. With specific volatile profiles for CBB‐damaged coffee identified, coffee samples can be tested in the lab, or potentially on the farm or in coffee mills, to identify high levels of CBB damage that may lead to off flavors and a reduction in product quality and value. © 2018 Society of Chemical Industry