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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
04/03/2021 |
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Data da última atualização: |
12/04/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ARTNER, M. A.; CADEMARTORI, P. H. G. de; AVELINO, F.; LEMONACO, D.; MAGALHAES, W. L. E. |
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Afiliação: |
Mirela Angelita Artner, PIPE - UFPR; Pedro Henrique Gonzalez de Cademartori, UFPR; Francisco Avelino, Instituto Federal de Educação, Ciência e Tecnologia do Ceará; Diego Lomonaco, Universidade Federal do Ceará; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
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Título: |
A novel design for nanocellulose reinforced urea-formaldehyde resin: a breakthrough in amino resin synthesis and biocomposite manufacturing. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Cellulose, v. 28, n. 6, p. 3435–3450, Apr. 2021. |
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DOI: |
https://doi.org/10.1007/s10570-021-03739-4 |
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Idioma: |
Inglês |
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Conteúdo: |
Urea?formaldehyde (UF) resins are often reinforced with natural fibers or nanostructures such as cellulose microfibrils (CMFs) to improve their mechanical and physical properties in wood panels. However, the high-water content in these suspensions is a limitation on applications in thermosetting resins. The innovative technology investigated here consists of the in-situ production of a methanediol-based suspension of CMFs through a mechanical process and its incorporation during resin synthesis. We sought to maintain the physicochemical properties and the basic chemical composition of the resin. The synergy between the resin and CMFs provided a shielding effect and a greater storage modulus (E?). We demonstrate that this approach is robust through standard viscoelastic, physical, and mechanical tests. Likewise, a methanediol-based CMF suspension used to synthesize UF resin was effective to reduce formaldehyde emission during the resin cure reactions. Finally, the bio-based composites manufactured with this UF resin containing CMF had better performance due to increased internal bond strength by up to 15%, reduced water absorption by up to 8%, and reduced formaldehyde emission by 30% at environmental temperature. |
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Palavras-Chave: |
Celulose microfibrilada; Microfibrillated cellulose; Nanocellulose; Nanocelulose; Urea formaldehyde resin; Ureia formaldeído; Wood panels. |
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Thesagro: |
Painel de Madeira; Resina. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02168naa a2200289 a 4500
001 2130463
005 2021-04-12
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10570-021-03739-4$2DOI
100 1 $aARTNER, M. A.
245 $aA novel design for nanocellulose reinforced urea-formaldehyde resin$ba breakthrough in amino resin synthesis and biocomposite manufacturing.$h[electronic resource]
260 $c2021
520 $aUrea?formaldehyde (UF) resins are often reinforced with natural fibers or nanostructures such as cellulose microfibrils (CMFs) to improve their mechanical and physical properties in wood panels. However, the high-water content in these suspensions is a limitation on applications in thermosetting resins. The innovative technology investigated here consists of the in-situ production of a methanediol-based suspension of CMFs through a mechanical process and its incorporation during resin synthesis. We sought to maintain the physicochemical properties and the basic chemical composition of the resin. The synergy between the resin and CMFs provided a shielding effect and a greater storage modulus (E?). We demonstrate that this approach is robust through standard viscoelastic, physical, and mechanical tests. Likewise, a methanediol-based CMF suspension used to synthesize UF resin was effective to reduce formaldehyde emission during the resin cure reactions. Finally, the bio-based composites manufactured with this UF resin containing CMF had better performance due to increased internal bond strength by up to 15%, reduced water absorption by up to 8%, and reduced formaldehyde emission by 30% at environmental temperature.
650 $aPainel de Madeira
650 $aResina
653 $aCelulose microfibrilada
653 $aMicrofibrillated cellulose
653 $aNanocellulose
653 $aNanocelulose
653 $aUrea formaldehyde resin
653 $aUreia formaldeído
653 $aWood panels
700 1 $aCADEMARTORI, P. H. G. de
700 1 $aAVELINO, F.
700 1 $aLEMONACO, D.
700 1 $aMAGALHAES, W. L. E.
773 $tCellulose$gv. 28, n. 6, p. 3435–3450, Apr. 2021.
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
03/10/2023 |
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Data da última atualização: |
24/04/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
VILVERT, J. C.; FREITAS, S. T. de; SANTOS, L. F. dos; RIBEIRO. T. da S.; VELOSO, C. M. |
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Afiliação: |
JOÃO C. VILVERT, Graduate Program in Agronomy, State University of Southwest Bahia, Vitoria da Conquista, BA; SERGIO TONETTO DE FREITAS, CPATSA; LUANA F. DOS SANTOS; TIFFANY DA S. RIBEIRO, University of Pernambuco, Petrolina, PE; CRISTIANE M. VELOSO, State University of Southwest Bahia, Itapetinga, BA. |
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Título: |
Phenolic compounds in acerola fruit and by-products: an overview on identification, quantification, influencing factors, and biological properties. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Journal of Food Measurement and Characterization, v. 18, p. 216–239, 2024. |
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DOI: |
https://doi.org/10.1007/s11694-023-02175-1 |
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Idioma: |
Inglês |
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Notas: |
Online. |
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Conteúdo: |
Acerola (Malpighia emarginata DC) is a cherry-like tropical fruit well-known for being a rich source of ascorbic acid (vitamin C) and phenolic compounds. This review provides a complete overview on aspects related to phenolic compounds of acerola fruit and by-products, comprising the identification and quantification of phenolic compounds, influencing fac- tors, and biological properties. Scientific evidences suggest that the acerola is a promising superfruit with great potential in the food and pharmaceutical industries. At least 76 phenolic compounds were identified using high performance liquid chromatography in acerolas, including 55 flavonoids (anthocyanins, flavan-3-ols, flavonols, flavones, flavanones, isoflavones and chalcones) and 21 non-flavonoids (phenolic acids, stilbenes and lignans). Phenolic compounds in acerola show several biological properties, including antioxidant, antibacterial, antihyperglycemic, antihyperlipidemic, anti-inflammatory, and hepatoprotective activities. However, studies are further required to assess the seasonal and genotypic influence on the phenolics of acerola and their bioaccessibility. Acerola is an anthocyanin-rich fruit with high potential for pigment extraction, but stabilization of anthocyanins in juice and pulp should be further elucidated and improved. |
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Palavras-Chave: |
Atividade antioxidante; Fitoquímicos; Polifenóis; Propriedades biológicas. |
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Thesagro: |
Acerola; Composto Fenólico; Fruta Tropical; Subproduto; Vitamina C. |
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Thesaurus NAL: |
Antioxidant activity; Malpighia emarginata; Phenolic compounds; Polyphenols. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/265741/1/Phenolic-compounds-in-acerola-fruit-and-by-product.pdf
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Marc: |
LEADER 02430naa a2200349 a 4500
001 2157062
005 2024-04-24
008 2024 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s11694-023-02175-1$2DOI
100 1 $aVILVERT, J. C.
245 $aPhenolic compounds in acerola fruit and by-products$ban overview on identification, quantification, influencing factors, and biological properties.$h[electronic resource]
260 $c2024
500 $aOnline.
520 $aAcerola (Malpighia emarginata DC) is a cherry-like tropical fruit well-known for being a rich source of ascorbic acid (vitamin C) and phenolic compounds. This review provides a complete overview on aspects related to phenolic compounds of acerola fruit and by-products, comprising the identification and quantification of phenolic compounds, influencing fac- tors, and biological properties. Scientific evidences suggest that the acerola is a promising superfruit with great potential in the food and pharmaceutical industries. At least 76 phenolic compounds were identified using high performance liquid chromatography in acerolas, including 55 flavonoids (anthocyanins, flavan-3-ols, flavonols, flavones, flavanones, isoflavones and chalcones) and 21 non-flavonoids (phenolic acids, stilbenes and lignans). Phenolic compounds in acerola show several biological properties, including antioxidant, antibacterial, antihyperglycemic, antihyperlipidemic, anti-inflammatory, and hepatoprotective activities. However, studies are further required to assess the seasonal and genotypic influence on the phenolics of acerola and their bioaccessibility. Acerola is an anthocyanin-rich fruit with high potential for pigment extraction, but stabilization of anthocyanins in juice and pulp should be further elucidated and improved.
650 $aAntioxidant activity
650 $aMalpighia emarginata
650 $aPhenolic compounds
650 $aPolyphenols
650 $aAcerola
650 $aComposto Fenólico
650 $aFruta Tropical
650 $aSubproduto
650 $aVitamina C
653 $aAtividade antioxidante
653 $aFitoquímicos
653 $aPolifenóis
653 $aPropriedades biológicas
700 1 $aFREITAS, S. T. de
700 1 $aSANTOS, L. F. dos
700 1 $aRIBEIRO. T. da S.
700 1 $aVELOSO, C. M.
773 $tJournal of Food Measurement and Characterization$gv. 18, p. 216–239, 2024.
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