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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
25/11/1999 |
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Data da última atualização: |
05/01/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FERREIRA, E. C.; NOGUEIRA, A. R. de A. |
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Afiliação: |
EDILENE C. FERREIRA, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Vanillin-condensed tannin study using flow injection spectrophotometry. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Talanta, v.51, p.1-6, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Studies involving the kinetic reaction between vanillin and condensed tannins were developed using a flow injection system with spectrophotometric determination. A solution of the monomeric compound (-)-epicatechin was used as the analytical standard. This compound was chosen due to its structure, which is similar to a polymeric unit of the condensed tannin present in plants. The results indicated that the vanillin - condensed tannin reaction is time dependent and affected by the degree of polymerization of the condensed tannin. The flow system allowed ( - )-epicatechin to be used without overestimating the content of the tannin present in the forage legume, guandu (Cajanus cajan (L.) Millsp.), studied. A relative standard deviation (R.S.D.) of < 1% was found for a 4 h period work and allowed the determination of about 60 samples h ' with a detection limit of 1.05 mg I ' for condensed tannin. When compared to the manual vanillin procedure, the proposed approach can be used with various advantages. |
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Palavras-Chave: |
Flow injection; Guandu seeds; Spectrophotometry; Tannin. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 01516naa a2200181 a 4500
001 1044611
005 2022-01-05
008 2000 bl uuuu u00u1 u #d
100 1 $aFERREIRA, E. C.
245 $aVanillin-condensed tannin study using flow injection spectrophotometry.$h[electronic resource]
260 $c2000
520 $aStudies involving the kinetic reaction between vanillin and condensed tannins were developed using a flow injection system with spectrophotometric determination. A solution of the monomeric compound (-)-epicatechin was used as the analytical standard. This compound was chosen due to its structure, which is similar to a polymeric unit of the condensed tannin present in plants. The results indicated that the vanillin - condensed tannin reaction is time dependent and affected by the degree of polymerization of the condensed tannin. The flow system allowed ( - )-epicatechin to be used without overestimating the content of the tannin present in the forage legume, guandu (Cajanus cajan (L.) Millsp.), studied. A relative standard deviation (R.S.D.) of < 1% was found for a 4 h period work and allowed the determination of about 60 samples h ' with a detection limit of 1.05 mg I ' for condensed tannin. When compared to the manual vanillin procedure, the proposed approach can be used with various advantages.
653 $aFlow injection
653 $aGuandu seeds
653 $aSpectrophotometry
653 $aTannin
700 1 $aNOGUEIRA, A. R. de A.
773 $tTalanta$gv.51, p.1-6, 2000.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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Biblioteca |
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Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Pesca e Aquicultura. |
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Data corrente: |
25/05/2018 |
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Data da última atualização: |
25/05/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
REIS, A. F. de B.; NASCENTE, A. S.; ALMEIDA, R. E. M. de; CHAGAS JÚNIOR, A. F. |
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Afiliação: |
ANDRÉ FROES DE BORJA REIS, ESALQ; ADRIANO STEPHAN NASCENTE, CNPAF; RODRIGO ESTEVAM MUNHOZ DE ALMEIDA, CNPASA; ALOÍSIO FREITAS CHAGAS JUNIOR, UNIVERSIDADE FEDERAL DO TOCANTINS, Gurupi-TO. |
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Título: |
Growth and nutrient contents in lowland rice due to phosphorus and potassium fertilization. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Tropical, v. 48, n. 2, p. 98-108, apr./jun. 2018. |
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ISSN: |
1983-4063 |
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DOI: |
10.1590/1983-40632018v4850666 |
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Idioma: |
Português |
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Conteúdo: |
In order to reach an optimum and sustainable production, growers must know the fertilizing potassium (K) and phosphorous (P) application rates. The present study aimed to determine the rice development in response to combined rates of P and K, on Plinthaquults (380-400 g kg-1 of clay), under high and low fertility conditions, in the tropical lowland plain of the Araguaia river, Brazil. Three field experiments were performed, each one consisting of a completely randomized factorial block design, with three replications. Treatments included a combination of six K2O rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1) with six P2O5 rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1). No interaction effect between P and K rates was observed for the evaluated variables in any fertility level/year. Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition, tillering capacity, yield components and grain yield of lowland rice, though no effects were observed due to the P application in high fertility soils and K in low fertility soils. Under high fertility conditions, the grain yield increment rate due to the K application was 4.04 kg ha-1, whereas in the low fertility areas, such as recently cleared fields, a maximum yield of 7,161 kg ha-1 was achieved by applying 140 kg ha-1 of P. |
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Thesagro: |
Arroz; Arroz Irrigado; Fósforo; Oryza Sativa; Potássio; Solo Tropical. |
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Thesaurus NAL: |
Phosphorus; Potassium; Rice; Tropical soils. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/177690/1/CNPAF-2018-pat.pdf
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Marc: |
LEADER 02296naa a2200301 a 4500
001 2091964
005 2018-05-25
008 2018 bl uuuu u00u1 u #d
022 $a1983-4063
024 7 $a10.1590/1983-40632018v4850666$2DOI
100 1 $aREIS, A. F. de B.
245 $aGrowth and nutrient contents in lowland rice due to phosphorus and potassium fertilization.$h[electronic resource]
260 $c2018
520 $aIn order to reach an optimum and sustainable production, growers must know the fertilizing potassium (K) and phosphorous (P) application rates. The present study aimed to determine the rice development in response to combined rates of P and K, on Plinthaquults (380-400 g kg-1 of clay), under high and low fertility conditions, in the tropical lowland plain of the Araguaia river, Brazil. Three field experiments were performed, each one consisting of a completely randomized factorial block design, with three replications. Treatments included a combination of six K2O rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1) with six P2O5 rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1). No interaction effect between P and K rates was observed for the evaluated variables in any fertility level/year. Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition, tillering capacity, yield components and grain yield of lowland rice, though no effects were observed due to the P application in high fertility soils and K in low fertility soils. Under high fertility conditions, the grain yield increment rate due to the K application was 4.04 kg ha-1, whereas in the low fertility areas, such as recently cleared fields, a maximum yield of 7,161 kg ha-1 was achieved by applying 140 kg ha-1 of P.
650 $aPhosphorus
650 $aPotassium
650 $aRice
650 $aTropical soils
650 $aArroz
650 $aArroz Irrigado
650 $aFósforo
650 $aOryza Sativa
650 $aPotássio
650 $aSolo Tropical
700 1 $aNASCENTE, A. S.
700 1 $aALMEIDA, R. E. M. de
700 1 $aCHAGAS JÚNIOR, A. F.
773 $tPesquisa Agropecuária Tropical$gv. 48, n. 2, p. 98-108, apr./jun. 2018.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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