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1.
J Agric Food Chem ; 66(10): 2370-2377, 2018 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-28285516

RESUMO

Orange fruits from huanglongbing (HLB)-infected trees do not fully mature and show a severe off-flavor described as bitter-harsh, metallic, and less juicy and fruity. The investigation of juice from HLB-infected (HLBOJ) and healthy control oranges (COJ) by gas chromatography-mass spectrometry showed higher concentrations of fruity esters, such as ethyl butyrate and ethyl 2-methylbutyrate, and soapy-waxy alkanals, such as octanal and decanal, in the COJ, whereas the HLBOJ showed higher concentrations of green aldehydes such as hexanal and degradation compounds of limonene and linalool such as α-terpineol. Application of aroma extract dilution analysis on terpeneless peel oil led to the identification of long-chained aldehydes such as ( E, E)-2,4-decadienal, ( Z)-8-tetradecenal, trans-4,5-epoxy-( E)-2-decenal, ( Z)-4-decenal, and octanal with the highest flavor dilution factors among 25 odor-active volatiles in the peel oil of healthy oranges. Taste-guided fractionation and identification of the HLBOJ secondary metabolites followed by sensory validation revealed that flavanoids such as hesperidin may modulate the flavor to evoke the unacceptable harsh/metallic taste impression. Quantitation of the bitter components showed good correlation between the limonoid and flavanoid concentrations with the off-flavor and quality of the oranges obtained throughout the season.


Assuntos
Citrus sinensis/química , Aromatizantes/química , Sucos de Frutas e Vegetais/análise , Mycoplasma/fisiologia , Doenças das Plantas/microbiologia , Citrus sinensis/metabolismo , Citrus sinensis/microbiologia , Aromatizantes/metabolismo , Frutas/química , Frutas/metabolismo , Frutas/microbiologia , Humanos , Limoninas/química , Limoninas/metabolismo , Paladar
2.
Nat Prod Commun ; 9(9): 1365-8, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25918813

RESUMO

Four commercial qualities of Hawaiian sandalwood oil produced from wood of Santalum paniculatum originating from the island of Hawaii ("The Big Island") were analyzed using GC and GC-MS. Main constituents of the oils were (Z)-α-santalol (34.5-40.4%) and (Z)-ß-santalol (11.0-16.2%). An odor evaluation of the oils was carried out against East Indian sandalwood oil. In addition, the chemical composition of Hawaiian sandalwood oil was compared with four different Santalum species originating from East India, New Caledonia, Eastern Polynesia and Australia, respectively.


Assuntos
Óleos de Plantas/química , Santalum/química , Sesquiterpenos/química , Austrália , Cromatografia Gasosa-Espectrometria de Massas , Havaí , Óleos de Plantas/classificação , Sesquiterpenos/classificação
3.
Nat Prod Commun ; 4(9): 1239-50, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19831037

RESUMO

Jasminum flexile flower absolute from the south of India and the corresponding vacuum headspace (VHS) sample of the absolute were analyzed using GC and GC-MS. Three other commercially available Indian jasmine absolutes from the species: J. sambac, J. officinale subsp. grandiflorum, and J. auriculatum and the respective VHS samples were used for comparison purposes. One hundred and twenty-one compounds were characterized in J. flexile flower absolute, with methyl linolate, benzyl salicylate, benzyl benzoate, (2E,6E)-farnesol, and benzyl acetate as the main constituents. A detailed olfactory evaluation was also performed.


Assuntos
Jasminum/química , Óleos de Plantas/química , Flores/química , Cromatografia Gasosa-Espectrometria de Massas , Perfumes/química
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