scholarly journals Metagenomic Study on Chinese Homemade Paocai: The Effects of Raw Materials and Fermentation Periods on the Microbial Ecology and Volatile Components

Foods ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 62
Author(s):  
Linjun Jiang ◽  
Shuang Xian ◽  
Xingyan Liu ◽  
Guanghui Shen ◽  
Zhiqing Zhang ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Theoretical Basis ◽  
Raw Materials ◽  
Volatile Components ◽  
Sequencing Technology ◽  
Volatile Organic ◽  
Metagenomic Study ◽  
Fermentation Period ◽  
Gas Chromatography Mass Spectroscopy ◽  
Red Radish

“Chinese paocai” is typically made by fermenting red radish or cabbage with aged brine (6–8 w/w). This study aimed to reveal the effects of paocai raw materials on fermentation microorganisms by metagenomics sequencing technology, and on volatile organic compounds (VOCs) by gas chromatography–mass spectroscopy, using red radish or cabbage fermented for six rounds with aged brine. The results showed that in the same fermentation period, the microbial diversity in cabbage was higher than that in red radish. Secundilactobacillus paracollinoides and Furfurilactobacillus siliginis were the characteristic bacteria in red radish paocai, whereas 15 species of characteristic microbes were found in cabbage. Thirteen kinds of VOCs were different between the two raw materials and the correlation between the microorganisms and VOCs showed that cabbage paocai had stronger correlations than radish paocai for the most significant relationship between 4-isopropylbenzyl alcohol, α-cadinol, terpinolene and isobutyl phenylacetate. The results of this study provide a theoretical basis for understanding the microbiota and their relation to the characteristic flavors of the fermented paocai.

GC-MS Studies on the Steam-distillate of the Medicinally Important Plant Cleome gynandra L.

2017 ◽  
Vol 3 (8) ◽  
Author(s):  
Partha Pradip Adhikari ◽  
Satya B. Paul ◽  
Manabendra Dutta Choudhury ◽  
Sudip Choudhury
Keyword(s):  
Gas Chromatography ◽  
Mass Spectroscopy ◽  
Volatile Components ◽  
Probable Structure ◽  
Steam Distillate ◽  
Hyphenated Technique ◽  
Cleome Gynandra ◽  
Gas Chromatography Mass Spectroscopy

The steam distillate of the medicinally important plant Cleome gynandra has been investigated through the Hyphenated technique of Gas Chromatography-Mass Spectroscopy (GC-MS). The distillate incorporated seven major volatile components. Probable structure of one of the major components has been elucidated.

Decomposition and Impurity Analysis of Organotellurium Precursors for MOVPE

1990 ◽  
Vol 204 ◽  
Author(s):  
J.E. Hails ◽  
I.R. Girling ◽  
D.R. Stern
Keyword(s):  
Gas Chromatography ◽  
Mass Spectroscopy ◽  
Direct Relevance ◽  
Decomposition Reactions ◽  
Impurity Analysis ◽  
Volatile Organic ◽  
Movpe Growth ◽  
Precursor Decomposition ◽  
Gas Chromatography Mass Spectroscopy

ABSTRACTThis paper discusses the application of gas chromatography-mass spectroscopy (GC-MS) to the assessment of precursors for the MOVPE growth of (Hg,Cd)Te. GC-MS has been used to analyse precursors for volatile organic and organometallic impurities. An extension of the technique has also allowed precursor decomposition reactions and interactions to be studied. Information obtained on alkyl purity, decomposition and interactions has been shown to be of direct relevance to the optimisation of growth.

Pemanfaatan Kulit Buah Kakao sebagai Antibakteri Escherichia coli dan Staphylococcus aureus

2019 ◽  
Vol 6 (2) ◽  
pp. 1017
Author(s):  
Mashuni Mashuni ◽  
La Ode Kadidae ◽  
M. Jahiding ◽  
Muh. Aksan Dermawan ◽  
Fitri Handayani Hamid
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Gas Chromatography ◽  
Mass Spectroscopy ◽  
Phenolic Content ◽  
Raw Materials ◽  
Total Phenolic ◽  
Dilution Method ◽  
Liquid Smoke ◽  
Gas Chromatography Mass Spectroscopy

The Cocoa pod husk (CPH) is a processed cocoa fruit waste, containing lignocellulosic biomass which can be pyrolysis to produce liquid smoke. The purpose of this study was to obtain antibacterial material from liquid smoke using the CPH pyrolysis method. This research method includes: preparation by drying the CPH raw materials for 5-7 days and then chopping the CPH sample dry. Furthermore, the pyrolysis process is carried out at 385-500 °C with a heating flow rate of 6 °C/min. The liquid smoke crude obtained is filtered and distilled fractionated to produce clearer liquid smoke. Analysis of Total Phenolic Content (TPC) of liquid smoke was carried out by the Folin-Ciocalteu (FC) method using gallic acid standards and Ultraviolet-Visible spectrophotometer instruments at maximum wavelength (λmax) 765 nm. The CPH liquid smoke antibacterial test was carried out using a dilution method with variations in liquid smoke concentrations of 5, 7, 10and 15%. The TPC of CPH liquid smoke is 1.035 g / L.The spectrogram analysis of Gas Chromatography-Mass spectroscopy (GC-MS)  of CPH liquid smoke shows the presence of compounds:acetic acid, Methyl glyoxal,Pyridine, 4-methyl- pyridine,  4-[2(methylamino)ethyl]- Phenol.The results of the analysis of the minimum inhibitory concentration (MIC) of CPH liquid smoke against Escherichia coli and Staphylococcus aureus bacteria were obtained at a concentration of 15%.This study shows that pyrolysis extraction can be used as a technique for obtaining extracts of phenolic compounds from CPH and is promising for safe antibacterial agents.Keywords: CPH, liquid smoke, pyrolysis, Phenolic, antibacterial.Abstrak Kulit buah kakao (KBK) merupakan limbah hasil olahan buah kakao, mengandung biomassa lignoselulosa yang dapat dipirolisis menghasilkan asap cair.Tujuan penelitian ini untuk mendapatkan zat antibakteri dari asap cair dengan metode pirolisis KBK. Metode penelitian ini meliputi: preparasi dengan pengeringan bahan baku KBK selama 5-7 hari kemudian dilakukan pencacahan  sampel KBK kering. Selanjutnya, Proses pirolisis dilakukan pada suhu 385-500°C dengan kecepatan alir pemanasan 6°C/menit.Crude asap cair yang diperoleh difiltrasi dan didestilasi fraksinasi untuk menghasilkan asap cair yang lebih jernih. AnalisisTotal Phenolic Content (TPC) asap cair dilakukan dengan metode Folin-Ciocalteu (FC) menggunakan standar asam galat dan instrumen spektrofotometer Ultraviolet-Visible pada panjang gelombang maksimum (λmaks) 765 nm. Uji antibakteri asap cair KBK dilakukan menggunakan metode dilusi dengan variasi konsentrasi asap cair yaitu 5, 7, 10dan 15%. TPC asap cair KBK sebesar 1,035 g/L.Analisis spectrogram Gas Chromatography-Mass spectroscopy (GC-MS) asap cair KBK menunjukkan adanya senyawa: asam asetat, metil glioksal, piridin, 4-metil-piridin, 4-[2(metilamino) etil]-fenol. Hasil analisiskonsentrasi hambat minimum (KHM) asap cairKBKterhadap bakteri Escherichia coli dan Staphylococcus aureus didapatkan pada konsentrasi 15%.Studi ini menunjukkan bahwa ekstraksi pirolisis dapat digunakan sebagai teknik untuk memperoleh ekstrak senyawa fenolik dari CPH dan menjanjikan untuk bahan antibakteri yang aman.Kata kunci: KBK, asap cair, pirolisis, fenolik, antibakteri.

scholarly journals Traceability of Volatile Organic Compounds by Gas Chromatography-Mass Spectrometry and Its Reduction in Rubber Composites of Tire Inner Liner

2021 ◽  
Author(s):  
Xin Chen ◽  
Boyu Zhang ◽  
Danling Wang ◽  
Li Chen ◽  
Zhenxia Du ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Raw Materials ◽  
Gas Chromatography Mass Spectrometry ◽  
Vehicle Cabin ◽  
Chromatography Mass Spectrometry ◽  
Volatile Organic ◽  
Total Volatile Organic Compounds

Abstract Many parts of the vehicle cabin generate volatile organic compounds (VOCs) and they are hazardous to humans. In this study, VOCs in the inner liner of automobile spare tire, and separately the significant materials used in it, like raw rubber and resins, were detected by gas chromatography-mass spectrometry (GC-MS) coupled with extracting method of static headspace sampling (SHS). By comparison, the sources of VOCs can be traced back to raw rubbers and resins. And the results indicated that alkylphenol resins are the most volatile raw materials, which would release 2,4,4-trimethyl-1-pentene, and 2,2,4,6,6-pentamethyl-3-heptene. Secondly, chlorobutyl rubber (CIIR) contained 3-methyl-pentane and methyl-cyclopentane. At the same time, through replacements of raw materials in initial formulation, such as alkylphenol resins and natural rubber (NR) with low VOCs, the total volatile organic compounds (TVOCs) discharged in inner liner could be reduced. We expected that the information gained from this work could provide references and positive significance for the manufacture of environmental-friendly tire products.

scholarly journals IDENTIFICATION OF AROMA COMPOUNDS OF DRIED AND FRESH THYME (THYMUS VULGARIS L.) BY GAS CHROMATOGRAPHY-OLFACTOMETRY AND GAS CHROMATOGRAPHY-MASS SPECTROSCOPY ANALYSIS

2020 ◽  
Vol 51 (1) ◽  
pp. 51-55
Author(s):  
Gulcin Yildiz ◽  
Ginnefer Cox ◽  
Linda Moran
Keyword(s):  
Gas Chromatography ◽  
Volatile Compounds ◽  
Mass Spectroscopy ◽  
Aroma Compounds ◽  
Lower Amount ◽  
Thymus Vulgaris ◽  
Volatile Components ◽  
Drying Methods ◽  
Gas Chromatography Olfactometry ◽  
Gas Chromatography Mass Spectroscopy

This study was conducted to determine aroma compounds of oven-dried thyme and fresh thyme and investigate the drying effect in key aroma compounds of thyme. Fresh thyme was purchased and utilized for two functions. The first function was for the application of drying methods (fresh thyme was oven dried at 50°C), and the second function to analyze the fresh thyme. After applying solvent direct extraction, volatile compounds were isolated. According to Gas Chromatography-Olfactometry (GC-O) and Gas Chromatography-Mass Spectroscopy (GC-MS) analysis results, lower amount of volatile compounds for dried thyme were identified, while more volatile components were present in fresh thyme.

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