GC-MS analysis of young and mature wild agarwood leaves (Aquilaria malaccensis Lamk) and its antioxidant potential

Abstract Agarwood grows wildly in the nature and its leaves may be utilized as raw materials for agarwood tea, especially from Aquilaria species. The study was conducted to determine the chemical compounds in the young and mature leaves of wild gaharu (Aquilaria malaccensis Lamk). Chemical compounds were detected using pyrolysis gas chromatography mass spectrometry (py-GCMS) while antioxidant capacity of the leaf extracts was assayed using 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) free radical method. The results obtained a total of 30 chemical compounds in agarwood leaves extract with different composition between young and mature leaves. The agarwood leaves extracts displayed strong antioxidative capacity with a main compound namely octadecanoid acid or stearic acid.

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Characterization and identification of Chinese historical rubbings preserved in Wuyuan Museum by Pyrolysis–Gas Chromatography/Mass Spectrometry

Heritage Science ◽

10.1186/s40494-021-00596-z ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

Na Yao ◽

Xiangsheng Zhan ◽

Qinglin Ma ◽

Shuya Wei

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Raw Materials ◽

Analytical Techniques ◽

Gas Chromatography Mass Spectrometry ◽

Pyrolysis Gas ◽

Pyrolysis Gas Chromatography ◽

Chromatography Mass Spectrometry ◽

Polycyclic Aromatic ◽

Different Origins

AbstractFor conservation and restoration purposes, the precious historical rubbings preserved in Wuyuan Museum were studied by multi-analytical techniques including 14C radiocarbon dating, scanning electron microscopy (SEM), Pyrolysis–Gas Chromatography/Mass Spectrometry (Py-GC/MS) and Herzberg staining method. The results showed that the Py-GC/MS method is an efficient method for identifying the raw materials of paper and ink in historical rubbings simultaneously. Through Py-GC/MS analysis, five types of constituents could be detected: (1) polycyclic aromatic hydrocarbons (PAHs) from soot; (2) compounds related to tar of conifer wood: retene and methyl dehydroabietate; (3) marker compounds from the whole egg; (4) additive compounds: menthol and curcumene, which were found for the first time in ink; (5) biochemical compounds from bark paper: β-amyrin and α-amyrin. Based on the above results, the ink type, binding media and additives in ink, as well as the fiber origin of the rubbing paper could be concluded. This study could not only provide scientific support for conservation and restoration of the historical rubbings preserved in Wuyuan museum, but also give method guidance for analysis of the uncharacterized rubbings from different origins.

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CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

Jurnal Natural ◽

10.30862/jn.v6i1.692 ◽

2008 ◽

Vol 6 (1) ◽

Author(s):

Markus Heryanto Langsa

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Organic Carbon ◽

Dissolved Organic Carbon ◽

Total Organic Carbon ◽

Gas Chromatography Mass Spectrometry ◽

Pyrolysis Gas ◽

Pyrolysis Gas Chromatography ◽

Chromatography Mass Spectrometry ◽

Pinus Radiate

Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (wandoo eucalyptus and pinus radiate, conifer) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV254 disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.

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