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The chemical composition of exhausted coffee waste

The chemical composition of exhausted coffee waste generated in a soluble coffee industry was investigated. The chemical characterization included elemental analysis, mineral composition and ash content, summative composition; acidic functional groups, lipophilic extractives, total polyphenols, condensed tannins determination and FTIR analysis. The spent coffee samples showed high carbon (>58%), low nitrogen (<2%), and low ash (<1%) contents and low polarity coefficient (O. +. N)/C (<0.5). The summative composition reveals that extractives are the main components of exhausted coffee wastes (54%). This percentage includes lipophilic fractions (24%), ethanol and water soluble compounds (5%), and compounds solubilized in 1% NaOH (26%). Lignin and polysaccharides were found in a similar proportion between 20 and 26%. The GC analysis of monosaccharide showed about 60% glucose and 40% mannose. The main components in the lipophilic extractives are free fatty acids (>60%) of which more than 30% was identified to be n-hexadecanoic acid. Total polyphenols and tannins represent <6% and <4% of the exhausted coffee wastes, respectively. Assignments of the bands of the obtained FTIR spectra confirm the presence of lipids, polysaccharides and chlorogenic acid. Exhausted coffee wastes showed characteristics for various potential applications such as biodiesel production, as a source of antioxidants and as a biosorbent of hydrophobic pollutants

This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2008-06776-C02-01. D. Pujol was financially supported by "Ministerio de Educacion, Cultura y Deporte" (MHE2011-00258) and a fellowship by "Universitat de Girona" (BR 10/09). A PhD fellowship from Chinese Scholarship Council [2011] 3005 was attributed to C. Liu. We thank Dr. Isabel Miranda for chemical methods and Joaquina Martins for laboratorial assistance

© Industrial Crops and Products, 2013, vol. 50, p. 423-429

Elsevier

Author: Pujol Oriola, David
Liu, Chang
Gominho, Jorge
Olivella Costa, Àngels
Fiol Santaló, Núria
Villaescusa Gil, Isabel
Pereira, Helena
Date: 2013
Abstract: The chemical composition of exhausted coffee waste generated in a soluble coffee industry was investigated. The chemical characterization included elemental analysis, mineral composition and ash content, summative composition; acidic functional groups, lipophilic extractives, total polyphenols, condensed tannins determination and FTIR analysis. The spent coffee samples showed high carbon (>58%), low nitrogen (<2%), and low ash (<1%) contents and low polarity coefficient (O. +. N)/C (<0.5). The summative composition reveals that extractives are the main components of exhausted coffee wastes (54%). This percentage includes lipophilic fractions (24%), ethanol and water soluble compounds (5%), and compounds solubilized in 1% NaOH (26%). Lignin and polysaccharides were found in a similar proportion between 20 and 26%. The GC analysis of monosaccharide showed about 60% glucose and 40% mannose. The main components in the lipophilic extractives are free fatty acids (>60%) of which more than 30% was identified to be n-hexadecanoic acid. Total polyphenols and tannins represent <6% and <4% of the exhausted coffee wastes, respectively. Assignments of the bands of the obtained FTIR spectra confirm the presence of lipids, polysaccharides and chlorogenic acid. Exhausted coffee wastes showed characteristics for various potential applications such as biodiesel production, as a source of antioxidants and as a biosorbent of hydrophobic pollutants
This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2008-06776-C02-01. D. Pujol was financially supported by "Ministerio de Educacion, Cultura y Deporte" (MHE2011-00258) and a fellowship by "Universitat de Girona" (BR 10/09). A PhD fellowship from Chinese Scholarship Council [2011] 3005 was attributed to C. Liu. We thank Dr. Isabel Miranda for chemical methods and Joaquina Martins for laboratorial assistance
Format: application/pdf
ISSN: 0926-6690
Document access: http://hdl.handle.net/10256/11946
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2011-2013/CTM2010-15185
MEC/PN 2009-2012/CTM2008-06776-C02-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.indcrop.2013.07.056
Articles publicats (D-Q)
Is part of: © Industrial Crops and Products, 2013, vol. 50, p. 423-429
Rights: Tots els drets reservats
Subject: Chemical elements -- Absorption and adsorption
Contaminants orgànics
Polluants organiques
Residus orgànics
Organic wastes
Metalls pesants -- Absorció i adsorció
Heavy metals -- Absorption and adsorption
Title: The chemical composition of exhausted coffee waste
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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