Chahan Yeretzian

Prof. Chahan Yeretzian


Research Focus & Metrics

Academic Career Length

41Years (1986-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
30 January 2013 in European Food Research and Technology
Verified
Journal Article
Open access
PDF file
AGAlexia N. Gloess
Alexia N. Gloess
BSBarbara Schönbächler
Barbara Schönbächler
BKBabette Klopprogge
Babette Klopprogge
LDLucio D`ambrosio
Lucio D`ambrosio
KCKarin Chatelain
Karin Chatelain
CYChahan Yeretzian
Chahan Yeretzian
The preparation of a cup of coffee may vary between countries, cultures and individuals. Here, an analysis of nine different extraction methods is presented regarding analytical and sensory aspects for four espressi and five lunghi. This comprised espresso and lungo from a semi-automatic coffee machine, espresso and lungo from a fully automatic coffee machine, espresso from a single-serve capsule system, mocha made with a percolator, lungo prepared with French Press extraction, filter coffee and lungo extracted with a Bayreuth coffee machine. Analytical measurements included headspace analysis with HS SPME GC/MS, acidity (pH), titratable acidity, content of fatty acids, total solids, refractive indices (expressed in °Brix), caffeine and chlorogenic acids content with HPLC. Sensory analysis included visual, aroma, flavor and textural attributes as well as aftersensation. The technical differences in the extraction methods led to a higher concentration of the respective quantities in the espressi than in the lunghi. Regarding the contents per cup of coffee, the lunghi generally had a higher content than the espressi. The extraction efficiency of the respective compounds was mainly driven by their solubility in water. A higher amount of water, as in the extraction of a lungo, generally led to higher extraction efficiency. Comparing analytical data with sensory profiles, the following positive correlations were found total solids ↔ texture/body, headspace intensity ↔ aroma intensity, concentrations of caffeine/chlorogenic acids ↔ bitterness and astringency.

1 January 1993 in Journal of the American Chemical Society
Verified
Journal Article
Closed access
YRYves Rubin
Yves Rubin
SKSaeed Khan
Saeed Khan
DFDaron I. Freedberg
Daron I. Freedberg
CYChahan Yeretzian
Chahan Yeretzian

1 September 1992 in Nature
Verified
Journal Article
Closed access
CYChahan Yeretzian
Chahan Yeretzian
KHKlavs Hansen
Klavs Hansen
FRFran
Fran
[C[Ccedil]
[Ccedil]

1 July 2011 in TrAC Trends in Analytical Chemistry
Verified
Journal Article
Closed access
Franco BiasioliFranco Biasioli
Franco Biasioli
FGFlavia Gasperi
Flavia Gasperi
CYChahan Yeretzian
Chahan Yeretzian
TMTilmann D. Märk
Tilmann D. Märk

1 January 1988 in Chemical Physics Letters
Verified
Journal Article
Closed access
MKManfred M. Kappes
Manfred M. Kappes
MSMartin Schär
Martin Schär
URUrsula Röthlisberger
Ursula Röthlisberger
CYChahan Yeretzian
Chahan Yeretzian
ESErnst Schumacher
Ernst Schumacher

7 February 2002 in European Food Research and Technology
Verified
Journal Article
Closed access
PDF file
CYChahan Yeretzian
Chahan Yeretzian
AJAlfons Jordan
Alfons Jordan
RBRaphael Badoud
Raphael Badoud
WLWerner Lindinger
Werner Lindinger