Anion exchangers with branched functional ion exchange layers of different hydrophilicity for ion chromatography

Shchukina, O.I.; Затираха, А.В.; Smolenkov, A. D.; Nesterenko, Pavel N.; Шпигун, О. А.

doi:10.1016/j.chroma.2015.06.039

Cited by 40 publications

(5 citation statements)

References 34 publications

(59 reference statements)

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“…The stationary phase is made up of resins, which can either be cationic or anionic in nature. Potassium hydroxide is the most popular mobile phase used for IE chromatography [ 77 ].…”

Section: Isolation Purification and Recovery Of Enzymesmentioning

confidence: 99%

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Ravindran¹,

Jaiswal²

2016

Bioengineering

116

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Enzymes are of great importance in the industry due to their substrate and product specificity, moderate reaction conditions, minimal by-product formation and high yield. They are important ingredients in several products and production processes. Up to 30% of the total production cost of enzymes is attributed to the raw materials costs. The food industry expels copious amounts of processing waste annually, which is mostly lignocellulosic in nature. Upon proper treatment, lignocellulose can replace conventional carbon sources in media preparations for industrial microbial processes, such as enzyme production. However, wild strains of microorganisms that produce industrially important enzymes show low yield and cannot thrive on artificial substrates. The application of recombinant DNA technology and metabolic engineering has enabled researchers to develop superior strains that can not only withstand harsh environmental conditions within a bioreactor but also ensure timely delivery of optimal results. This article gives an overview of the current complications encountered in enzyme production and how accumulating food processing waste can emerge as an environment-friendly and economically feasible solution for a choice of raw material. It also substantiates the latest techniques that have emerged in enzyme purification and recovery over the past four years.

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“…The stationary phase is made up of resins, which can either be cationic or anionic in nature. Potassium hydroxide is the most popular mobile phase used for IE chromatography [ 77 ].…”

Section: Isolation Purification and Recovery Of Enzymesmentioning

confidence: 99%

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Ravindran¹,

Jaiswal²

2016

Bioengineering

116

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“…The zeta potential measurements show that the HSP-TAA vesicles were positively charged below the isoelectric point of pH 9 (Figure b), which is attributed to the protonation of TAA groups on the surface of the vesicles. With an increase in the solution pH far above the isoelectric point (pH > 12), the hydrophobicity of alkanolamine increased, leading to the increase in hydrophobicity of the vesicles. − Thus, the vesicle would aggregate together driven by the intervesicular hydrophobic interactions, and an aggregation-induced fusion among the vesicles was observed. Figure c shows some vesicle intermediates in the fusion process (red circles), which lead to the formation of many big vesicles of approximately 15 μm in diameter (Figure d).…”

Section: Resultsmentioning

confidence: 99%

Polymer Vesicle Sensor for Visual and Sensitive Detection of SO₂ in Water

Huang

Hou

et al. 2016

Langmuir

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This study reports the first polymer vesicle sensor for the visual detection of SO and its derivatives in water. A strong binding ability between tertiary alkanolamines and SO has been used as the driving force for the detection by the graft of tertiary amine alcohol (TAA) groups onto an amphiphilic hyperbranched multiarm polymer, which can self-assemble into vesicles with enriched TAA groups on the surface. The polymer vesicles will undergo proton exchange with cresol red (CR) to produce CR-immobilized vesicles (CR@vesicles). Subsequently, through competitive binding with the TAA groups between CR and SO or HSO, the CR@vesicles (purple) can quickly change into SO@vesicles (colorless) with the release of protonated CR (yellow). Such a fast purple to yellow transition in the solution allows the visual detection of SO or its derivatives in water by the naked eye. A visual test paper for SO gas has also been demonstrated by the adsorption of CR@vesicles onto paper. Meanwhile, the detection limit of CR@vesicles for HSO is approximately 25 nM, which is improved by approximately 30 times when compared with that of small molecule-based sensors with a similar structure (0.83 μM). Such an enhanced detection sensitivity should be related to the enrichment of TAA groups as well as the CR in CR@vesicles. In addition, the CR@vesicle sensors also show selectivity and specificity for the detection of SO or HSO among anions such as F, Br, Cl, SO, NO, CO, SO, SCN, AcO, SO, S, and HCO.

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“…They can be applied in the adsorption of strong acids, but the kinetics is prolonged. Amine resins have good yield and are regenerated by NaOH, NH4OH or NaCO3 [29,30].…”

Section: Anion Exchangermentioning

confidence: 99%

Ion Chromatography: Principles and instrumentation

Moura

Silva

Gubert

2022

Orbital: Electron. J. Chem.

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Ion chromatography (IC) is one of the most used analytical methods for the determination of inorganic cations and anions, as well as organic ions. It is considered a method of separation with simple steps, low cost and with good efficiency in chromatographic separation. In addition, it has good validation metrics such as sensitivity, selectivity, precision, robustness, low detection limit and quantification. IC easily replaces conventional wet chemistry methods, which tend to have more analysis steps. The easy extraction of samples, in most cases, does not require organic solvents, facilitating the disposal of waste. Since its creation, IC has accumulated advantages and good acceptance in the food, pharmaceutical, environmental monitoring industries, in addition to increasing implementation in academic research laboratories.

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Anion exchangers with branched functional ion exchange layers of different hydrophilicity for ion chromatography

Cited by 40 publications

References 34 publications

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Polymer Vesicle Sensor for Visual and Sensitive Detection of SO₂ in Water

Ion Chromatography: Principles and instrumentation

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Anion exchangers with branched functional ion exchange layers of different hydrophilicity for ion chromatography

Cited by 40 publications

References 34 publications

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Microbial Enzyme Production Using Lignocellulosic Food Industry Wastes as Feedstock: A Review

Polymer Vesicle Sensor for Visual and Sensitive Detection of SO2 in Water

Ion Chromatography: Principles and instrumentation

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Polymer Vesicle Sensor for Visual and Sensitive Detection of SO₂ in Water