scholarly journals Performance of erythorbic acid as an oxygen scavenger in thermally aged lean MEG

2018 ◽  
Vol 170 ◽  
pp. 911-921 ◽  
Author(s):  
Ammar Al Helal ◽  
Adam Soames ◽  
Rolf Gubner ◽  
Stefan Iglauer ◽  
Ahmed Barifcani
Keyword(s):  
Oxygen Scavenger ◽  
Erythorbic Acid

scholarly journals Capability of oxygen-scavenger sachets and modified atmosphere packaging to extend fresh barberry shelf life

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Razieh Niazmand ◽  
Samira Yeganehzad
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Phenolic Compounds ◽  
Shelf Life ◽  
Herbal Remedy ◽  
Physicochemical Characterization ◽  
Modified Atmosphere Packaging ◽  
Storage Period ◽  
Modified Atmosphere ◽  
Oxygen Scavenger

Abstract Background Barberry has long been used as an herbal remedy since ancient times which is found throughout temperate and subtropical regions of the world. Given the short harvesting season and limited shelf life of the barberry, we evaluated the possibility of using modified atmosphere packaging and oxygen-scavenger sachets to increase its storage period. For this purpose, the physicochemical characterization (antioxidant activity, anthocyanin, phenolic compounds, and ascorbic acid content, acidity, firmness, color, and decay incident) of fresh barberry samples packaged within different atmospheres was investigated over 4 weeks of storage at 4 and 25 °C. The barberries were packaged with low-density polyethylene/polyester (LDPE/PET) films under natural atmosphere (C), N2 gas (N), vacuum (V), or in the presence of an oxygen scavenger (OS). Results The results revealed that with increased storage period, the O2 and CO2 levels inside the packages decreased and increased, respectively. The antioxidant activity and amounts of anthocyanin, phenolic compounds, and ascorbic acid all decreased with increasing storage period. Among the studied atmospheres, the OS and, subsequently, V packages were most capable of maintaining the quality of fresh barberries, with the decay incidence being approximately 30 times lower inside these packages relative to the control. Increasing the storage temperature accelerated the intensity of chemical changes and decay across all samples. Conclusion The barberries inside the OS packages stored at 4 °C (and even at 25 °C) still had good sensory properties in terms of chemical properties, texture, and color after 4 weeks. Fortunately, it seems that this packaging technology makes the exportation and delayed consumption of the fresh barberry possible by maintaining its quality.

scholarly journals Electroless Gold Plating Using Erythorbic Acid as Reducing Agent

2006 ◽  
Vol 74 (6) ◽  
pp. 479-483 ◽  
Author(s):  
Tadashi KURASHINA ◽  
Hiroshi NISHINAKAYAMA ◽  
Norio KANEKO ◽  
Naoyuki SHINOHARA ◽  
Hidemi NAWAFUNE
Keyword(s):  
Reducing Agent ◽  
Gold Plating ◽  
Erythorbic Acid ◽  
Electroless Gold

Oxygen Absorption Kinetics of Sheets and Films Containing a Commercial Iron-based Oxygen Scavenger

2009 ◽  
Vol 15 (2) ◽  
pp. 159-168 ◽  
Author(s):  
M.J. Galotto ◽  
S.A. Anfossi ◽  
A. Guarda
Keyword(s):  
Relative Humidity ◽  
Kinetic Parameters ◽  
Oxygen Absorption ◽  
Absorption Kinetics ◽  
Oxygen Scavenger ◽  
Arrhenius Behavior ◽  
Oxygen Scavengers ◽  
Iron Based ◽  
Empirical Growth ◽  
Kinetics Of

Absorption kinetics of three different forms of the same iron-based oxygen scavenger were studied. Oxygen scavengers were used as pellet, sheet, and film materials. Two scavenger concentrations were used for sheet and film forms. Scavenger samples were analyzed at 75 or 100% relative humidities and stored at 5, 15, and 25°C. Oxygen concentration in the headspace was measured as a function of time. Absorption kinetics was best described by the Chapman-Richards empirical growth model rather than by a first-order reaction. Arrhenius behavior was observed for variations in the final absorption rate with temperature. Absorption capacities, final absorption rates, and activation energies were evaluated and discussed. Scavenger concentration, relative humidity, and temperature effects on kinetic parameters were studied for each experimental condition. Temperature was the most important factor that affected kinetic parameters. At the relative humidity levels studied, any important effect on kinetic parameters was not observed, except on absorption capacities.

The Influence of Stereochemistry of Antioxidants and Flavanols on Oxidation Processes in a Model Wine System: Ascorbic Acid, Erythorbic Acid, (+)-Catechin and (−)-Epicatechin

2010 ◽  
Vol 58 (2) ◽  
pp. 1004-1011 ◽  
Author(s):  
Andrew C. Clark ◽  
Jochen Vestner ◽  
Célia Barril ◽  
Chantal Maury ◽  
Paul D. Prenzler ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Oxidation Processes ◽  
Erythorbic Acid

Sodium sulfite as a switching agent for single molecule based super-resolution optical microscopy

2021 ◽  
Author(s):  
Anders K Engdahl ◽  
Oleg Grauberger ◽  
Mark Schüttpelz ◽  
Thomas Huser
Keyword(s):  
Single Molecule ◽  
Fluorescent Dyes ◽  
Sodium Sulfite ◽  
Super Resolution ◽  
Oxygen Scavenger ◽  
Dark State ◽  
Alexa Fluor ◽  
High Illumination ◽  
Human Osteosarcoma Cells ◽  
Super Resolution Microscopy

Photoinduced off-switching of organic fluorophores is routinely used in super-resolution microscopy to separate and localize single fluorescent molecules, but the method typically relies on the use of complex imaging buffers. The most common buffers use primary thiols to reversibly reduce excited fluorophores to a non-fluorescent dark state, but these thiols have a limited shelf life and additionally require high illumination intensities in order to efficiently switch the emission of fluorophores. Recently a high-index, thiol-containing imaging buffer emerged which used sodium sulfite as an oxygen scavenger, but the switching properties of sulfite was not reported on. Here, we show that sodium sulfite in common buffer solutions reacts with fluorescent dyes, such as Alexa Fluor 647 and Alexa Fluor 488 under low to medium intensity illumination to form a semi-stable dark state. The duration of this dark state can be tuned by adding glycerol to the buffer. This simplifies the realization of different super-resolution microscopy modalities such as direct Stochastic Reconstruction Microscopy (dSTORM) and Super-resolution Optical Fluctuation Microscopy (SOFI). We characterize sulfite as a switching agent and compare it to the two most common switching agents by imaging cytoskeleton structures such as microtubules and the actin cytoskeleton in human osteosarcoma cells.

Efficacy of Bisulfite Ions as an Oxygen Scavenger in Monoethylene Glycol (At Least 20 wt%)/Water Mixtures

SPE Journal ◽  
2017 ◽  
Vol 22 (05) ◽  
pp. 1467-1477 ◽  
Author(s):  
Mobin Salasi ◽  
Thunyaluk Pojtanabuntoeng ◽  
Sindee Wong ◽  
Marc Lehmann
Keyword(s):  
Transition Metal ◽  
Oxygen Removal ◽  
Low Ph ◽  
Experimental Results ◽  
Oxygen Scavenger ◽  
Ph Values ◽  
Oxygen Scavenging ◽  
Monoethylene Glycol

Summary This study investigates the oxygen-scavenging behavior of bisulfite ions in monoethylene glycol (MEG)/water mixtures at concentrations commonly found in gas-transportation pipelines. Temperatures and pH values were varied. The influence of transition-metal (TM) ions to catalyze the bisulfite oxygen scavenging was studied. Experimental results indicate that MEG significantly inhibits bisulfite oxygen removal, which is hindered at low pH values and, to some extent, temperature. TMs can accelerate the oxygen-scavenging reaction in pH-unadjusted solutions, although the rate was still lower than that of the pH-adjusted solutions. The possible mechanism for such behavior and industrial implications are discussed.

scholarly journals Pengaruh Kombinasi Konsentrasi 1-Methylcyclopropene dan Asam Askorbat terhadap Kualitas Ketahanan Simpan Pascapanen Buah Tomat Beef ‘Valoasis RZ’

Agrikultura ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 1
Author(s):  
Lilis Sugiarti ◽  
Syariful Mubarok ◽  
Kusumiyati Kusumiyati
Keyword(s):  
Oxygen Scavenger ◽  
Ethylene Inhibitor

Tomat beef merupakan salah satu jenis tomat eksklusif yang dapat menjadi peluang bisnis. Permasalahan pascapanen buah tomat adalah adanya lonjakan produksi etilen pada saat proses pematangan yang berakibat buah tidak dapat disimpan dalam waktu lama. Pematangan buah tomat dapat diperlambat salah satunya dengan cara menghambat produksi etilen dengan 1-Methylcyclopropene (1-MCP) yang berfungsi sebagai ethylene inhibitor dikombinasikan dengan asam askorbat (AA) sebagai oxygen scavenger. Tujuan penelitian ini adalah untuk menentukan kombinasi terbaik antara konsentrasi 1-MCP dan AA terhadap ketahanan simpan dan kualitas pascapanen buah tomat beef ’Valoasis RZ’. Penelitian dilaksanakan di Laboratorium Analisis Tanaman dan Pascapanen Hortikultura, Fakultas Pertanian Universitas Padjadjaran di Jatinangor. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap dengan 9 perlakuan dan 3 ulangan. Buah dipanen pada tingkat kematangan yang sama yaitu kulit buah berwarna pink. Buah diberi perlakuan kombinasi konsentrasi 1-MCP 0μL/L, 1 μL/L dan 2 μL/L dengan AA 0%, 2% dan 4%. Hasil percobaan menunjukkan bahwa kombinasi konsentrasi 1-MCP 1 μL/L dan AA 2% lebih efektif dalam meningkatkan ketahanan simpan buah tomat ‘Valoasis RZ’ dengan menghambat penurunan susut bobot buah selama 21 hari penyimpanan. Kombinasi konsentrasi 1-MCP 2 μL/L dan AA 4% memberikan hasil terbaik dalam mempertahankan kekerasan buah tomat beef selama 21 hari penyimpanan.

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