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Sediments in coffee extracts: Composition and control by enzymatic hydrolysis
P A Delgado1, J A Vignoli2, M Siika-Aho3
1School of Chemical Engineering, State University of Campinas, UNICAMP, P.O. Box 6066, 13081-970 Campinas, SP, Brazil.
Food Chemistry
|June 8, 2015
Summary
Galactomannan causes sediment in instant coffee production. Specific enzymes, like Pectinase 444L, Rohapect B1L, and Galactomannanase ACH, effectively reduce this sediment by hydrolyzing insoluble coffee extract components.
Area of Science:
- Food Science
- Biotechnology
- Chemical Engineering
Background:
- Water-insolubility of coffee extract components limits instant coffee production.
- Sediment formation is a key challenge in processing coffee extracts.
- Polysaccharides are implicated in the insolubility and sedimentation issues.
Purpose of the Study:
- To identify the main polysaccharide responsible for coffee extract sediment formation.
- To investigate the efficacy of various commercial enzymes in hydrolyzing insoluble coffee fractions.
- To determine the optimal enzymes and conditions for reducing coffee extract sediment.
Main Methods:
- Preparation and chemical composition analysis of coffee extract fractions and sediments.
- Carbohydrate analysis to identify polysaccharide components.
- Enzymatic hydrolysis assays using twelve commercial enzymes on insoluble fractions.
- Evaluation of enzyme effectiveness based on sugar release and sediment reduction.
Main Results:
- Galactomannan was identified as the primary polysaccharide in insoluble coffee fractions, contributing to sediment.
- Pectinase 444L showed high efficacy in releasing mannose and galactose sugars.
- Biopectinase CCM, Rohapect B1L, Pectinase 444L, and Galactomannanase ACH were most effective in reducing coffee extract sediment.
- Rohapect B1L and Galactomannanase ACH achieved the highest sediment reduction at specific enzyme concentrations.
Conclusions:
- Galactomannan is the key component responsible for sediment in coffee extracts.
- Enzymatic hydrolysis offers a viable strategy to mitigate sediment formation.
- Specific enzymes like Rohapect B1L and Galactomannanase ACH show significant potential for improving instant coffee production processes.
Keywords:
Coffee compositionCoffee polysaccharidesEnzymatic hydrolysisGalactomannansInstant coffeeSedimentMore Related Videos
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