Using tea stalk lignocellulose as an adsorbent for separating decaffeinated tea catechins

• Published in: Bioresource technology Vol. 100; no. 2; pp. 622 - 628
• Main Authors: Ye, J.H., Jin, J., Liang, H.L., Lu, J.L., Du, Y.Y., Zheng, X.Q., Liang, Y.R.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-01-2009; [New York, NY]: Elsevier Ltd; Elsevier
• Subjects: adsorbents; Adsorption; Agronomy. Soil science and plant productions; Antioxidant; Bagasse; Biological and medical sciences; Caffeine; Caffeine - isolation & purification; Camellia sinensis; Camellia sinensis - chemistry; Catechin - isolation & purification; decaffeination; flavanols; Food industries; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Lignin - chemistry; lignocellulose; Macroporous resin; Pine sawdust; Pinus massoniana; Plant Components, Aerial; Plant Extracts - chemistry; renewable resources; resins; Saccharum; Saccharum sinensis; sawdust; sugarcane bagasse; tea; Tea - chemistry; Ultrafiltration - methods; Use and upgrading of agricultural and food by-products. Biotechnology; Use of agricultural and forest wastes. Biomass use, bioconversion; Pine sawdust; Antioxidant; Bagasse; Caffeine; Macroporous resin; Tea; Catechin; Lignocellulosics; Adsorbent; Resins; Sawdust; Macroporosity
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2008.07.003

Lignocelluloses prepared from woody tea stalk, pine sawdust and sugarcane bagasse were used as adsorbents to isolate decaffeinated catechins from tea extracts and compared with synthetic macroporous resin HPD 600. HPD 600 had the highest adsorption capacity to catechins, followed by tea stalk lignocellulose while lignocelluloses of pine sawdust and bagasse the least. Tea stalk lignocellulose absorbed preferentially tea catechins and showed a good selectivity. HPD 600 absorbed caffeine and tea catechins simultaneously. The kinetics data of tea stalk lignocellulose showed a good fit with the Langmuir isotherm model. It is considered that tea stalk lignocellulose is an alternative low-cost adsorbent for preparing decaffeinated tea catechins.