Mass spectrometry-based electric nose system for assessing rice quality during storage at different temperatures

2014 ◽  
Vol 59 ◽  
pp. 204-208 ◽  
Author(s):  
Jeehye Sung ◽  
Bum-Keun Kim ◽  
Byung-Sam Kim ◽  
Yoonsook Kim
Keyword(s):  
Mass Spectrometry ◽  
Rice Quality ◽  
Different Temperatures ◽  
Electric Nose

scholarly journals Aroma retention during drying of caja-umbu fruit pulp

2018 ◽  
Author(s):  
Narendra Narain ◽  
Anderson Santos Fontes ◽  
Maria Terezinha Santos Leite-Neta ◽  
Patricia Nogueira Matos ◽  
Hannah Caroline Santos Araújo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Phenolic Compounds ◽  
Volatile Compounds ◽  
Spray Drying ◽  
Gas Chromatography Mass Spectrometry ◽  
Total Phenolic ◽  
Fruit Pulp ◽  
Total Phenolic Compounds ◽  
Different Temperatures

This study was aimed to obtain and characterize the dried powder of cajá-umbu (Spondias spp) fruit pulp obtained by spray-drying and lyophilization. Spray-drying of the pulp was done at different temperatures. Analysis of bioactive compounds and volatile compounds was performed. The total phenolic compounds content was high in the dried powder obtained at the temperature of 140 °C. The volatiles analysis of dried powders revealed  that the powder dried at  140°C contained a larger number of compounds. The cajá-umbu powder showed that it is a better alternative for storage and conservation since it retained the majority of volatile compounds. Keywords: Cajá-umbu, volatile compounds, gas chromatography, mass spectrometry.

Deuterium Diffusion, Trapping and Stability in Buried Silicon Dioxide Layers

1998 ◽  
Vol 513 ◽  
Author(s):  
A. Boutry-Forveille ◽  
A. Nazarov ◽  
D. Ballutaud
Keyword(s):  
Mass Spectrometry ◽  
Silicon Dioxide ◽  
Isothermal Annealing ◽  
Secondary Ion Mass Spectrometry ◽  
Oxide Layers ◽  
Buried Oxide ◽  
Different Temperatures ◽  
Hydrogen Deuterium ◽  
Secondary Ion ◽  
Diffusion Profiles

ABSTRACTThe interaction of hydrogen (deuterium used as tracer) with Si-Si02-Si buried oxide layers (BOX) prepared by thermal oxidation or by oxygen implantation (SIMOX) are investigated using Secondary Ion Mass Spectrometry (SIMS) measurements combined with effusion experiments. The sample deuteration is performed at different temperatures between 150 and 300°C using a radiofrequency plasma. In SIMOX samples, the deuterium diffusion profiles analysed by SIMS show deuterium trapping on implantation defects, and deuterium diffusion in the silicon substrate by permeation through the oxide layer for temperatures higher than 250°C. The deuterium is still detected in the buried oxide layers after isothermal annealing at 600°C during 2 hours. The deuterium trapping at the siliconsilicon dioxide interfaces is analysed.

scholarly journals Proteomic responses to hypoxia at different temperatures in the Great Scallop (Pecten maximus)

2014 ◽  
Author(s):  
Sébastien SA Artigaud ◽  
Camille CL Lacroix ◽  
Joëlle JR Richard ◽  
Jonathan Flye-Sainte-Marie ◽  
Luca LB Bargelloni ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Anaerobic Metabolism ◽  
Pecten Maximus ◽  
Thermal Window ◽  
Great Scallop ◽  
Coastal Marine ◽  
Proteomic Approach ◽  
Different Temperatures ◽  
Proteomic Responses ◽  
Octopine Dehydrogenase

Hypoxia and hyperthermia are two connected consequences of the ongoing global change that constitute major threats for coastal marine organisms. In the present study, we used a proteomic approach to characterize the changes induced by hypoxia in individuals of the great scallop, Pecten maximus, subjected to three different temperatures, i.e. 10°C, 18°C and 25°C. We did not observe any significant change induced by hypoxia in animals acclimated at 10°C. Contrastingly at 18°C and 25°C, 16 and 11 protein spots were differentially accumulated between normoxia and hypoxia, respectively. Moreover, biochemical data, i.e. octopine dehydrogenase activity and arginine assays suggests that animals grown at 25°C switched their metabolism towards anaerobic metabolism when exposed to either normoxia or hypoxia, suggesting that this temperature is out of the scallops’ optimal thermal window. In all, 11 proteins could be unambiguously identified by mass spectrometry, involved in protein modifications and signaling (e.g. CK2, TBK1), metabolism (e.g. ENO3) or cytoskeleton (GSN). The potential roles of these proteins in the thermal-dependent response of scallops to hypoxia are discussed.

scholarly journals Identification of Aroma Compounds in Freeze-dried Strawberries and Raspberries by HS-SPME-GC-MS

2020 ◽  
Vol 9 (4) ◽  
pp. 30
Author(s):  
Fadwa Al-Taher ◽  
Boris Nemzer
Keyword(s):  
Mass Spectrometry ◽  
Volatile Compounds ◽  
Solid Phase ◽  
Aroma Compounds ◽  
Gas Chromatography Mass Spectrometry ◽  
Solid Phase Micro Extraction ◽  
Aroma Profile ◽  
Spme Fiber ◽  
Freeze Dried ◽  
Different Temperatures

The objective of this study was to determine a method for the identification of aroma volatile compounds in freeze-dried (FD) strawberries and raspberries for quality purposes. The aroma profile was examined using headspace solid-phase micro-extraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). FD strawberries and raspberries were extracted at four different times (10,15, 20 and 30 min) and three different temperatures (40 °C, 60 °C and 80 °C) using a SPME fiber coated with 50/30 µm divinylbenzene/carboxen on polydimethylsiloxane (DVB/CAR-PDMS) to determine optimum recoveries for aroma volatile compounds. The DVB/CAR-PDMS SPME fiber showed the best extraction of aroma volatile compounds from strawberry and raspberry at 60°C for 15 min. Twenty-nine volatile compounds were identified from the strawberry samples and 20 from the raspberry samples, including terpenes, aldehydes, esters, acids and alcohols. Select aroma compounds in FD strawberries and raspberries were quantitated using SPME and GC-MS. It is important to determine the desirable aroma active compounds in freeze-dried strawberries and raspberries for quality uses since they are becoming popular commercially.

scholarly journals Listeria monocytogenes utilizes the ClpP1/2 proteolytic machinery for fine-tuned substrate degradation under heat stress

2021 ◽  
Author(s):  
Dóra Balogh ◽  
Konstantin Eckel ◽  
Christian Fetzer ◽  
Stephan A. Sieber
Keyword(s):  
Mass Spectrometry ◽  
Listeria Monocytogenes ◽  
Elevated Temperatures ◽  
Sos Response ◽  
Wild Type ◽  
Substrate Degradation ◽  
Proteomic Approach ◽  
Different Temperatures ◽  
Cellular Pathways

Listeria monocytogenes exhibits two ClpP isoforms (ClpP1/ClpP2) which assemble into a heterooligomeric complex with enhanced proteolytic activity. Herein, we demonstrate that the formation of this complex depends on temperature and reaches a maximum ratio of about 1:1 at heat shock conditions, while almost no complex formation occurred below 4 °C. In order to decipher the role of the two isoforms at elevated temperatures, we constructed L. monocytogenes ClpP1, ClpP2 and ClpP1/2 knockout strains and analyzed their protein regulation in comparison to the wild type (WT) strain via whole proteome mass-spectrometry (MS) at 37 °C and 42 °C. While ΔclpP1 strain only altered the expression of very few proteins, ΔclpP2 and ΔclpP1/2 strains revealed the dysregulation of many proteins at both temperatures. These effects were corroborated by crosslinking co-immunoprecipitation MS analysis. Thus, while ClpP1 serves as a mere enhancer of protein degradation in the heterocomplex, ClpP2 is essential for ClpX binding and thus functions as a gatekeeper for substrate entry. Applying an integrated proteomic approach combining whole proteome and co immunoprecipitation datasets, several putative ClpP2 substrates were identified in the context of different temperatures and discussed with regards to their function in cellular pathways such as the SOS response.

Investigation of Titanium Silicide Formation Using Secondary Ion Mass Spectrometry

1994 ◽  
Vol 342 ◽  
Author(s):  
Andrew T.S. Wee ◽  
Alfred C.H. Huan ◽  
W.H. Thian ◽  
K.L. Tan ◽  
Royston Hogan
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Secondary Ion Mass Spectrometry ◽  
Titanium Silicide ◽  
Formation Mechanisms ◽  
Silicide Formation ◽  
Formation Reaction ◽  
Ion Mass Spectrometry ◽  
Different Temperatures ◽  
Secondary Ion

ABSTRACTSecondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS) are used to investigate Ti silicide formation mechanisms on a series of Ti on Si thin films annealed in ultrahigh vacuum (UHV) at different temperatures and durations. The competition between oxygen diffusion and the silicide formation reaction (the socalled “snowplough” effect) is observed directly, as well as a Ti-Si-O layer. The results from these controlled experiments are compared with those from Ti silicide films formed under rapid thermal annealing (RTA) conditions in a production furnace, with and without a TiW barrier layer.

The Variability and Determinants of Testosterone Measurements in Children: A Critical Review

2021 ◽  
pp. 109980042110173
Author(s):  
Jessa Rose Li ◽  
Xan Goodman ◽  
June Cho ◽  
Diane Holditch-Davis
Keyword(s):  
Mass Spectrometry ◽  
Critical Review ◽  
Cochrane Library ◽  
Sample Collection ◽  
Developmental Problems ◽  
Different Temperatures ◽  
Recent Trends ◽  
Assay Methods ◽  
Low Levels

Aims: This critical review aimed to summarize: (1) the variability and determinants of testosterone (T) measurements; and (2) reference values for the variability and determinants of T measurements in children. Background: As T is a representative androgen, it has been widely used to explain male vulnerability to child health and developmental problems. T measurements in children, however, have been challenging because of low levels, diurnal and episodic secretion patterns, limited quantity and quality of the samples, and inconsistent study findings. Methods: The search strategy used PubMed, CINAHL, Cochrane Library, Embase, Scopus, and Google Scholar. Studies published between 2008 through 2020 that examined factors influencing T measurement were included. The final 30 studies were selected using two appraisal forms. We extracted five categories of data from the reports. Findings: Variability and determinants of T measurement included assay methods, the source of samples, and child demographic and environmental characteristics. T levels were higher 1–3 months after birth and in males up to 1 year; fewer sex differences were found up to 10–12 years. Serum T levels measured by using liquid chromatography-mass spectrometry were most reliable because immunoassays overestimated the levels, especially in neonates. T levels were stable at different temperatures and durations of storage, although sample collection remained an ongoing challenge for researchers. Conclusion: Depending on the study aims and feasibility, mass-spectrometry, multi-methods, and multi-materials are the recent trends in T measurement. Immunoassays may be an option if the study aims for relative rather than absolute comparisons.

scholarly journals Mercury’s Sodium Exosphere: An <i>ab initio</i> Calculation to Interpret MASCS/UVVS Observations from MESSENGER

2018 ◽  
Author(s):  
Diana Gamborino ◽  
Audrey Vorburger ◽  
Peter Wurz
Keyword(s):  
Mass Spectrometry ◽  
Monte Carlo ◽  
Thermal Desorption ◽  
Mass Spectrometry Data ◽  
Altitude Range ◽  
Meteorite Impact ◽  
Observation Well ◽  
Characteristic Energy ◽  
Physical Conditions ◽  
Different Temperatures

Abstract. The optical spectroscopy measurements of sodium in Mercury’s exosphere by MESSENGER MASCS/UVVS have been interpreted before with a model employing two exospheric components of different temperatures. Here we use an updated version of the Monte Carlo (MC) exosphere model developed by Wurz and Lammer (2003) to calculate the Na content of the exosphere for the observation conditions. In addition, we compare our results to the ones according to Chamberlain theory. Studying several release mechanisms, we find that close to the surface thermal desorption dominates driven by a surface temperature of 594 K, whereas at higher altitudes micro-meteorite impact vaporization prevails with a characteristic energy of 0.34 eV. From the surface up to 500 km the MC model results agree with the Chamberlain model, and both agree well with the observations. At higher altitudes, the MC model using micro-meteorite impact vaporization explains the observation well. We find that the combination of thermal desorption and micro-meteorite impact vaporization reproduces the observation of the selected day quantitatively over the entire observed altitude range, with the calculations performed based on the prevailing environment and orbit parameters. These findings may help to improve our understanding of the physical conditions at Mercury’s exosphere, as well as to better interpret mass-spectrometry data obtained to date and in future missions, such as BepiColombo.

scholarly journals Proteomic responses to hypoxia at different temperatures in the Great Scallop (Pecten maximus)

2014 ◽  
Author(s):  
Sébastien SA Artigaud ◽  
Camille CL Lacroix ◽  
Joëlle JR Richard ◽  
Jonathan Flye-Sainte-Marie ◽  
Luca LB Bargelloni ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Anaerobic Metabolism ◽  
Pecten Maximus ◽  
Thermal Window ◽  
Great Scallop ◽  
Coastal Marine ◽  
Proteomic Approach ◽  
Different Temperatures ◽  
Proteomic Responses ◽  
Octopine Dehydrogenase

Hypoxia and hyperthermia are two connected consequences of the ongoing global change that constitute major threats for coastal marine organisms. In the present study, we used a proteomic approach to characterize the changes induced by hypoxia in individuals of the great scallop, Pecten maximus, subjected to three different temperatures, i.e. 10°C, 18°C and 25°C. We did not observe any significant change induced by hypoxia in animals acclimated at 10°C. Contrastingly at 18°C and 25°C, 16 and 11 protein spots were differentially accumulated between normoxia and hypoxia, respectively. Moreover, biochemical data, i.e. octopine dehydrogenase activity and arginine assays suggests that animals grown at 25°C switched their metabolism towards anaerobic metabolism when exposed to either normoxia or hypoxia, suggesting that this temperature is out of the scallops’ optimal thermal window. In all, 11 proteins could be unambiguously identified by mass spectrometry, involved in protein modifications and signaling (e.g. CK2, TBK1), metabolism (e.g. ENO3) or cytoskeleton (GSN). The potential roles of these proteins in the thermal-dependent response of scallops to hypoxia are discussed.

Differentiation of cultivation areas and crop years of milled rice using single grain mass spectrometry

2019 ◽  
Vol 43 (5) ◽  
pp. 2118-2125 ◽  
Author(s):  
Susu Shen ◽  
Hua Zhang ◽  
Keke Huang ◽  
Huanwen Chen ◽  
Wenxin Shen ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Rapid Detection ◽  
Rice Grain ◽  
Milled Rice ◽  
Rice Quality ◽  
Single Grain ◽  
Single Rice

A method for the rapid detection of fatty acids in single rice grain would make the evaluation of rice quality easier.

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