Sequential mixture design optimization for divergent metabolite analysis: Enriched carbon dioxide effects on Coffea arabica L. leaves and buds

TALANTA

卷:191

Article

Tormena, Claudia D.¹  Marcheafave, Gustavo G.¹  Rakocevic, Miroslava^2,3  Bruns, Roy E.⁴  Scarminio, Ieda S.¹ 

[1] Univ Estadual Londrina, Lab Quimiometria Ciincias Nat, Dept Quim, CP 6001, BR-86051990 Londrina, PR, Brazil

[2] Embrapa Agr Informat, Ave Andre Tosello 209,POB 6041, BR-13083886 Campinas, SP, Brazil

[3] Embrapa Environm, Rodovia SP 340,Km 127-5, BR-13820000 Jaguariuna, SP, Brazil

[4] Univ Estadual Campinas, Inst Quim, CP 6154, BR-13083970 Campinas, SP, Brazil

关键词: Statistical mixture design;    Multicomponent fractionation;    CO2;    Secondary metabolism;    Coffea arabica leaves;    Buds;   

DOI  :  10.1016/j.talanta.2018.09.002

来源: Elsevier

【 摘 要 】

The first metabolic study of the impact of elevated CO2 (590 mu L CO2 L-1) levels on the leaves and buds of Coffea arabica L. plants is reported. A novel sequential statistical mixture design strategy allowed optimization of both the extraction and mobile phase solvent systems to increase differences detected in metabolites of Coffea arabica L. plants and buds. Factor analysis showed that the 227 and 273 nm bands of the 1:1:1 ternary ethyl ether dichloromethane - methanol mixture spectra resulted in discrimination of elevated CO2 extract samples from those obtained from leaves grown in a current level CO2 atmosphere (390 mu L CO2 L-1) of leaf sample extracts. DAD-HPLC spectral peak evidence showed a 32% increase in absorbance of the 273 band for the enriched CO2 leaf extracts. This band has been assigned to caffeine-like substances and confirmed by the mass spectral signal at m/z 195 ([A + H](+)). No enrichment band increases were found for kahweol, kaempferol and quercetin that had presence confirmed by mass spectral analysis. No epigenetic effect of this metabolic profile was found in new leaves after the addition of CO2 stopped. Enriched CO2 perturbation of the bud metabolite were much smaller than for the leaf samples. Absorbance increases in the 228 nm and decreases in the 235 nm bands play a prominent role in the discrimination of enriched CO2 buds from the controls in the pure dichloromethane extracting solvent. This global metabolome strategy allows the monitoring of chemical groups of plants susceptible to environmental changes as well as elucidate metabolic variations in complex matrices of biochemical

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