Data/hora: 22/06/2024 01:53:35

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	12/02/2014	
Data da última atualização: 	10/11/2021	
Autoria: 	AGUIAR, N. O.; NOVOTNY, E. H.; OLIVEIRA, A. L.; RUMJANEK, V. M.; OLIVARES, F. L.; CANELLAS, L. P.	
Afiliação: 	Núcleo de Desenvolvimento de Insumos Biológicos para a Agricultura (Nudiba), Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF); ETELVINO HENRIQUE NOVOTNY, CNPS; Laboratório de Química do Núcleo de Criminalística da Superintendência da Polícia Federal no Estado do Rio de Janeiro; Laboratório de Química do Núcleo de Criminalística da Superintendência da Polícia Federal no Estado do Rio de Janeiro; Núcleo de Desenvolvimento de Insumos Biológicos para a Agricultura (Nudiba), Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF); L.P. Canellas, Núcleo de Desenvolvimento de Insumos Biológicos para a Agricultura (Nudiba), Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF).	
Título: 	Prediction of humic acids bioactivity using spectroscopy and multivariate analysis.	
Ano de publicação: 	2013	
Fonte/Imprenta: 	Journal of Geochemical Exploration, v. 129, p. 95-102, Jun. 2013.	
DOI: 	https://doi.org/10.1016/j.gexplo.2012.10.005	
Idioma: 	Inglês	
Conteúdo: 	Humic substances (HS) represent the organic material most widespread in nature and have positive effects on plant physiology influencing nutrient uptake and root architecture. Understanding the structure-activity relationship has been considered an essential step to drive technological approaches to produce HS with enhanced plant growth promotion performance. In this studywe used solid state nuclear magnetic resonance (CP-MAS 13C NMR) and infrared spectroscopy with diffuse reflectance (DRIFT), a collection of data from humic acid-like substances (HA) obtained from vermicompost produced with different sources of raw material and maturation stage. The bioactivity was evaluated using the ability of HA to induce lateral root emergence sites as well acidification of the liquidmediumby treated-maize root seedlings. The structure-activity relationshipwas done using multivariate analysis including principal component analysis (PCA), principal component regression (PCR) and Spearman correlation joined with NMR and DRIFT results. The main variables (higher loadings) correlated with HA bioactivity were for NMR positive loadings for lignin (56 ppm, 124 ppm, 148 and 153 ppm) and COOH groups (174 ppm) and negative loadings for carbohydrates (64, 75 and 102 ppm). For DRIFT the main positive loadings were aryl stretching and bending (1560, 1480, 860 and 780 cm-1) probably from lignins; for 2926 cm-1 and 2852 cm-1 due to C-H asymmetric and symmetric stretching, respectively, probably from long chain fat acids due to the presence of rocking absorption band of (CH2)n with n>4 at 720 cm-1 and negative loadings due to carbohydrate moieties (around 1100 cm-1, C-O stretching) and carboxylic acids (1724 cm-1, C-O stretching and 1220 cm-1, C-OH stretching and CO-H bending). The use of spectroscopy data to attempt to relate structure to bioactivity may be of practical interest in developing plant growth promoters using renewed source of humic materials.	
Palavras-Chave: 	Análise multivariada; Efeitos fisiológicos; Espectroscopia RMN; Relação bioatividade estrutural; Tração.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (17944-1) - UPC - AP - DD -  -  - 2014.00067 - DIS