Identification of volatile (micro) biological compounds from household waste and building materials by thermal desorption-capillary gas chromatography-mass spectroscopy

1995 ◽  
Vol 18 (6) ◽  
pp. 373-377 ◽  
Author(s):  
Cornelius Kendall Wilkins ◽  
Kjeld Larsen
Keyword(s):  
Gas Chromatography ◽  
Thermal Desorption ◽  
Mass Spectroscopy ◽  
Capillary Gas Chromatography ◽  
Building Materials ◽  
Household Waste ◽  
Biological Compounds ◽  
Gas Chromatography Mass Spectroscopy

scholarly journals Chemical Compositions and Tyrosinase Activity of the Essential Oils of Alpinia aquatica

2018 ◽  
Vol 13 (6) ◽  
pp. 1934578X1801300 ◽  
Author(s):  
Nissha Bharrathi Romes ◽  
Norazah Basar ◽  
Hasnah M. Sirat ◽  
Siti Ernieyanti Hashim ◽  
Zaini Asim
Keyword(s):  
Gas Chromatography ◽  
Essential Oils ◽  
Mass Spectroscopy ◽  
Capillary Gas Chromatography ◽  
Chemical Compositions ◽  
Inhibition Activity ◽  
Tyrosinase Inhibition ◽  
Germacrene D ◽  
Leaf Oil ◽  
Gas Chromatography Mass Spectroscopy

The essential oils obtained from the fresh rhizome, leaf, and pseudostem of Alpinia aquatica Roscoe. were hydrodistillated and analyzed using capillary gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). β-Pinene (11.7%), α-humulene (8.9%), aromadendrene (8.7%), and sabinene (7.7%) were the major components in the rhizome oil. The most abundant components of the leaf oil were germacrene D (21.3%), β-pinene (15.6%) and sabinene (12.1%), while α-humulene (19.8%), germacrene D (15.2%) and β-caryophyllene (8.7%) were the main constituents in the pseudostem oil. Antityrosinase assay revealed that all the three essential oils exhibited weak tyrosinase inhibition activities. The rhizome oil showed the highest inhibition activity with the value of 9.5% for the L-DOPA oxidation.

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