03714nab a2200265 i 4500003000900000005001700009008004100026040001800067072000800085072000800093100001500101100001800116100001800134100001700152100002000169245014000189500007600329520128700405520142901692650001203121650001403133650002103147773021003168856007003378BR-BrBNA20240228105801.0240228b2006    bl.qr|p|oa||| 00| 0 por |  aBR-BrBNAbpor  aQ02  aF60  aReis, G.G.  aPeisino, A.L.  aAlberto, D.L.  aMendes, M.F.  aCalçada, L.A.  aEstudo do efeito da secagem em convecção natural e forçada na composição do óleo essencial da citronela (Cymbopogon nardus)  aPublicação on-line; 11 ref.; 3 tables; 9 illus.; Summaries (En, Pt)  a

RESUMO: 

Vários trabalhos são encontrados na literatura citando a eficácia das velas de citronela e do
seu princípio ativo. No comércio, pode-se adquirir os óleos extraídos ou a planta in natura. Este trabalho
tem o objetivo de avaliar o efeito da secagem no teor das substâncias presentes na citronela seca e
fresca. A metodologia do trabalho constou da avaliação dos óleos essenciais presentes nas plantas
recém colhidas (frescas) e em plantas secas nas condições ambiente, a 50, 60 e 70°C em convecção
natural em estufa e a 70°C em convecção forçada em um secador construído no DEQ/UFRRJ. Para
extração do óleo essencial das folhas de citronela utilizou-se o aparelho Clevenger. A composição dos
produtos presentes nos extratos foi feita por cromatografia a gás acoplada ao espectrômetro de massas.
Os óleos essenciais obtidos da citronela seca ou fresca caracterizam-se por misturas complexas, devido
ao grande número de componentes. Observou-se a presença de ésteres de ácidos graxos somente nas
plantas frescas. A secagem em convecção natural e forçada não causou empobrecimento dos princípios
ativos do óleo essencial obtido.

Palavras-chave: hidrodestilação, secagem, citronela, citronelal  a

ABSTRACT: 

Study ofthe drying effect in the composition ofthe essential oil of citronela (Cymbopogon
nardus). Many works are cited in the literature showing the efficiency of the citronella sail and its active
natural principles. In the market, there are available extracted oils (essences) or the plant in nature. This
work has as an objective the evaluation of the drying effect in the composition of the dried and wet leaves.
The methodology of the work was based on an evaluation of the essential oils present in the wet and dried
leaves and in leaves dried at normal temperature and at 50, 60 and 70°C in natural convection in a
greenhouse and at 70°C in natural convection in a dryer constructed in the Chemical Engineering Department
(UFRRJ). The extraction of the essential oil was done in a Clevenger apparatus. The analysis of the
compositions of the components present in the extracts were done by a gas chromatograph coupled to a
mass spectrofotometer. The essential oils obtained using wet and drying leaves of citronela were
characterized by complex mixtures due to the number of components. It was observed the presence of
esters of fatty acids only in the oils obtained by the wet leaves. In relation of the drying leaves of citronella,
there were no changing in the composition of the essential oils of the dried leaves at 50, 60 and 70°C.

Key words: hydrodistillation, drying, citronella, citronelal  aSECAGEM  aCITRONELA  aÓLEO ESSENCIAL0 03543dBotucatu-SP Instituto de Biociências - Departamento de Química e Bioquímica 1998o2024-0053tRevista Brasileira de Plantas Medicinais (Brazil)x1516-0572gv. 8(4) p. 47-55; (2006)wBR2024000075  uhttp://www.sbpmed.org.br/admin/files/papers/file_qMhrNu6CC2Uz.pdf