Results 201 to 210 of about 26,772 (253)
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De-esterification and sulfonation in spruce CTMP: Effects on pulp and paper properties
Holzforschung, 2006Abstract De-esterification and sulfonation reactions, which create new anionic groups in the middle lamella and primary wall layers, are the key chemical reactions in chemithermomechanical pulping. The effects of these reactions on the resulting fibre dimensions, refining energy demand, hand-sheet bulk and strength properties were assessed ...
Jonas Konn +3 more
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In‐situ pectin de‐esterification of alkali‐treated fruit waste materials
Journal of the Science of Food and Agriculture, 1989AbstractWaste peel and pulp materials from orange, lime and mango fruits were treated with sodium carbonate which increased the pH and resulted in the de‐esterification of pectin in situ. Chemical and enzymic (pectinesterase) de‐esterification occurred in each of the treated fruit waste materials.
Karen King +3 more
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Journal of Hazardous Materials, 2020
Microbial degradation is considered to be the most acceptable method for degradation of chlorimuron-ethyl, a typical long-term residual sulfonylurea herbicide, but the underlying mechanism at the genetic and biochemical levels is unclear. In this work, the genome sequence of the chlorimuron-ethyl-degrading bacterium Rhodococcus erythropolis D310-1 was ...
Hailian Zang +8 more
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Microbial degradation is considered to be the most acceptable method for degradation of chlorimuron-ethyl, a typical long-term residual sulfonylurea herbicide, but the underlying mechanism at the genetic and biochemical levels is unclear. In this work, the genome sequence of the chlorimuron-ethyl-degrading bacterium Rhodococcus erythropolis D310-1 was ...
Hailian Zang +8 more
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Journal of the Science of Food and Agriculture, 2008
AbstractBACKGROUND: Pectinmethylesterase (PME, E.C. 1.1.11) isozymes from Valencia orange preparations with different specific activities were used to de‐esterify citrus and sugar beet pectins. Enzymatic modification offers the opportunity to create pectins of tailored functionality and gelling ability.RESULTS: Based on nuclear magnetic resonance ...
Hyoungill Lee +4 more
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AbstractBACKGROUND: Pectinmethylesterase (PME, E.C. 1.1.11) isozymes from Valencia orange preparations with different specific activities were used to de‐esterify citrus and sugar beet pectins. Enzymatic modification offers the opportunity to create pectins of tailored functionality and gelling ability.RESULTS: Based on nuclear magnetic resonance ...
Hyoungill Lee +4 more
openaire +1 more source
Xenobiotica, 1978
1. Two mammalian metabolites of the herbicidal ester, flamprop-isopropyl (BARNON), have been characterized as products of omega-hydroxylation of the isopropoxycarbonyl grouping (-CO2 CHMe 2). 2. Hydroxylation at the methine group of this moiety, to afford an unstable lactol (-CO2C(OH)Me2) and thence the corresponding carboxylic acid also appears to ...
C T, Bedford +3 more
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1. Two mammalian metabolites of the herbicidal ester, flamprop-isopropyl (BARNON), have been characterized as products of omega-hydroxylation of the isopropoxycarbonyl grouping (-CO2 CHMe 2). 2. Hydroxylation at the methine group of this moiety, to afford an unstable lactol (-CO2C(OH)Me2) and thence the corresponding carboxylic acid also appears to ...
C T, Bedford +3 more
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Mode of De-esterification of Alkaline and Acidic Pectin Methyl Esterases at Different pH Conditions
Journal of Agricultural and Food Chemistry, 2006Highly esterified citrus pectin was de-esterified at pH 4.5 and 8.0 by a fungal pectin methyl esterase (PME) that was shown to have an acidic isoelectric pH (pI) and an acidic pH optimum and by a plant PME that was characterized by an alkaline pI and an alkaline pH optimum.
Thomas, Duvetter +6 more
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Journal of Agricultural and Food Chemistry, 1998
Different concentrations of potassium hydroxide in methanol were used to control the time required for complete de-esterification of the carotenoids present in paprika oleoresin, and the effectiveness of the overall process was determined. With concentrated solutions of potash, 20% and 30% (w/v), the reaction was completed in a shorter time but the ...
, Mínguez Mosquera MI +1 more
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Different concentrations of potassium hydroxide in methanol were used to control the time required for complete de-esterification of the carotenoids present in paprika oleoresin, and the effectiveness of the overall process was determined. With concentrated solutions of potash, 20% and 30% (w/v), the reaction was completed in a shorter time but the ...
, Mínguez Mosquera MI +1 more
openaire +2 more sources
Biotechnology Progress, 2002
Abstract The pectin methylesterase (PME) catalyzed de‐esterification of pectin was studied in four frozen food model systems based on sucrose, fructose, maltodextrin, and carboxymethylcellulose (CMC) in a temperature range from –24 to 20 °C, with the aim of elucidating the applicability of the theory of “food ...
Netsanet Shiferaw, Terefe +1 more
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Abstract The pectin methylesterase (PME) catalyzed de‐esterification of pectin was studied in four frozen food model systems based on sucrose, fructose, maltodextrin, and carboxymethylcellulose (CMC) in a temperature range from –24 to 20 °C, with the aim of elucidating the applicability of the theory of “food ...
Netsanet Shiferaw, Terefe +1 more
openaire +2 more sources
Journal of the Science of Food and Agriculture, 2005
AbstractCommercial high methoxyl pectin was de‐esterified using chemical saponification or by pectinmethylesterases. A commercial fungal pectin methyl esterase (PME) (EC 3.1.1.11), free of polygalacturonase, or a citrus Valencia PME was used to de‐esterify pectin enzymatically to a targeted degree of esterification.
Janice L Hunter, Louise Wicker
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AbstractCommercial high methoxyl pectin was de‐esterified using chemical saponification or by pectinmethylesterases. A commercial fungal pectin methyl esterase (PME) (EC 3.1.1.11), free of polygalacturonase, or a citrus Valencia PME was used to de‐esterify pectin enzymatically to a targeted degree of esterification.
Janice L Hunter, Louise Wicker
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[Study on alkaline hydrolysis of polyglutamate for de-esterification].
Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi, 2002This paper reports the alkaline hydrolysis of poly(methyl glutamate), poly (benzyl glutamate) and copoly(methyl glutamate-benzyl glutamate-glutamic acid) for de-esterification. The results showed that in this process of alkaline hydrolysis the demethylation of poly(methyl glutamate) was faster, but debenzylation of poly(benzyl glutamate) was hardly ...
S, Pan, Q, Wang
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