Evaluation of potential applications for chestnut (Castanea sativa) shell and eucalyptus (Eucalyptus globulus) bark extracts |
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| Authors: | G. Vázquez J. González-Alvarez J. Santos M.S. Freire G. Antorrena |
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| Affiliation: | 1. Natural Resources and Environment Engineering Department, School of Forestry Engineering, University of Vigo, Campus A Xunqueira S/n., 36005 Pontevedra, Spain;2. School of Forestry Engineering, University of Vigo, Campus A Xunqueira S/n., 36005, Pontevedra, Spain;3. Chemical Engineering Department, School of Forestry Engineering, University of Vigo, Campus A Xunqueira S/n., 36005, Pontevedra, Spain;4. Chemical Engineering Department, School of Industrial Engineering, University of Vigo, Campus Lagoas-Marcosende S/n, 36310, Vigo-Pontevedra, Spain;1. Unité de recherche de chimie industrielle organique et alimentaire 00UR/1201, Institut National des Sciences Appliquées et de Technologie INSAT, Centre Urbain Nord B.P. N°676/1080, Tunis, Tunisia;2. IPREM-EPCP, IUT des Pays de l’Adour, 371 rue du Ruisseau, BP 201, 40004 Mont de Marsan, France;3. IPREM-EPCP (UMR 5254), Université de Pau et des Pays de l’Adour, Pau Cedex 9, France;1. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal;2. Universidade Federal de Viçosa (UFV), Avenida Peter Henry Rolfs, 36571-000, Viçosa, Minas Gerais, Brazil;1. Department of Food Science, University of Bologna, Piazza Goidanich 60, I-47521 Cesena, FC, Italy;2. Department of Analytical Chemistry, University of Valencia, Doctor Moliner 50, E-46100 Burjassot, Valencia, Spain;1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, 710021, Xi’an, China;2. College of Chemistry and Chemical Engineering, Ankang University, 725000, Ankang, China;3. Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, 710021, Xi’an, China;4. College of Economics and Management, Shaanxi University of Science and Technology, 710021, Xi’an, China |
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| Abstract: | ![]()
The potential of chestnut shell and eucalyptus bark extracts as phenol substitutes in the formulation of adhesives, as chrome substitutes in leather tanning and as a source of antioxidants compounds has been studied. The influence of extraction conditions, type and concentration of alkaline compounds (NaOH, Na2SO3 and Na2CO3) and temperature, on extraction yield and on extract characteristics: Stiasny number, tannin content, total phenols content, FRAP (ferric reducing/antioxidant power) antioxidant capacity and molecular weight distribution was analysed. Chestnut shell extracts had much better properties than eucalyptus bark extracts and significantly higher extraction yields were obtained. The increase of temperature from 70 to 90 °C not only increased the extraction yield but also improved the quality of the extracts. For both materials, the 2.5% Na2SO3–90 °C extract, together with the 2.5% NaOH–2.5% Na2SO3–90 °C extract for chestnut shell, showed high extraction yields and the best properties for all the applications proposed. |
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