The effect of processing on chlorogenic acid content of commercially available coffee

Mills, C. ORCID: https://orcid.org/0000-0002-8313-3700, Oruna-Concha, M. J. ORCID: https://orcid.org/0000-0001-7916-1592, Mottram, D. S., Gibson, G. R. ORCID: https://orcid.org/0000-0002-0566-0476 and Spencer, J. P. E. ORCID: https://orcid.org/0000-0003-2931-7274 (2013) The effect of processing on chlorogenic acid content of commercially available coffee. Food Chemistry, 141 (4). pp. 3335-3340. ISSN 0308-8146 doi: 10.1016/j.foodchem.2013.06.014

Abstract/Summary

Chlorogenic acids (CGA) are a class of polyphenols noted for their health benefits. These compounds were identified and quantified, using LC–MS and HPLC, in commercially available coffees which varied in pro- cessing conditions. Analysis of ground and instant coffees indicated the presence of caffeoylquinic acids (CQA), feruloylquinic acids (FQA) and dicaffeoylquinic acids (diCQA) in all 18 samples tested. 5-CQA was present at the highest levels, between 25 and 30% of total CGA; subsequent relative quantities were: 4- CQA > 3-CQA > 5-FQA > 4-FQA > diCQA (sum of 3,4, 3,5 and 4,5-diCQA). CGA content varied greatly (27.33–121.25 mg/200 ml coffee brew), driven primarily by the degree of coffee bean roasting (a high amount of roasting had a detrimental effect on CGA content). These results highlight the broad range of CGA quantity in commercial coffee and demonstrate that coffee choice is important in delivering opti-mum CGA intake to consumers.