precocene ii
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2021 ◽  
Vol 27 (2) ◽  
pp. 181-190
Author(s):  
Malik Fiaz Hussain Ferdosi ◽  
Arshad Javaid ◽  
Iqra Haider Khan ◽  
Muhammad F. A. Ferdosi ◽  
Ayesha Munir

In order to find out various bioactive compounds in flowers of Ageratum conyzoides, a weed of the family Asteraceae, the dried powdered flowers were extracted in analytical grade methanol and the extract was examined by GC-MS. In total, eight constituents were identified. The predominant compound in the extract was precocene II (59.50%). Three moderately abundant compounds included ethanone, 1-(7-hydroxy-5-methoxy-2,2-dimethyl-2H-1-benzopyran-6-yl)- (9.77%), precocene I (8.61%) and caryophyllene (7.60%). Three compounds namely (E)-β-famesene (4.23%), β-cubebene (4.19%) and 1-nonadecene (4.07%) were categorized as less abundant. The eighth compounds phytol was the least abundant one with peak are of 1.99%. The literature survey showed that most of the identified compounds possessed various biological properties such as aphid repellant, antioxidant, anticancer, antimicrobial and/or anti-inflammatory.





2019 ◽  
Vol 97 (1) ◽  
pp. 179-186
Author(s):  
Abdelgawad FAHMI ◽  
Mahmoud NASSAR ◽  
Erian MANSOUR ◽  
Anwaar ABAZA ◽  
RANIA SALAMA




PLoS ONE ◽  
2015 ◽  
Vol 10 (8) ◽  
pp. e0135031 ◽  
Author(s):  
Tomohiro Furukawa ◽  
Naoko Sakamoto ◽  
Michio Suzuki ◽  
Makoto Kimura ◽  
Hiromichi Nagasawa ◽  
...  


2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Xiao Nan Lu ◽  
Xin Chao Liu ◽  
Qi Zhi Liu ◽  
Zhi Long Liu

The aim of this research was to determine chemical composition and insecticidal activities of the essential oil ofAgeratum houstonianumMill. aerial parts against booklice,Liposcelis bostrychophilaBadonnel, and to isolate any insecticidal constituents from the oil. Essential oil ofA. houstonianumwas obtained by hydrodistillation and analyzed by GC-MS. A total of 35 components in the essential oil were identified. The major compounds were precocene II (62.68%), precocene I (13.21%), andβ-caryophyllene (7.92%). Based on bioactivity-guided fractionation, precocene II and precocene I were isolated and identified as the active constituents. The essential oil exhibited contact toxicity againstL. bostrychophilawith an LC50value of 50.8 μg/cm2. Precocene II (LC50= 30.4 μg/cm2) exhibited stronger acute toxicity than precocene I (LC50= 64.0 μg/cm2) against the booklice. The essential oil and the two isolated constituents also possessed strong repellent activity againstL. bostrychophila. The results indicated that the essential oil and its constituent compounds have potential for development into natural insecticides or repellents for control of insects in stored grains.



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