Catalytical conversion of carbohydrates in subcritical water: A new chemical process for lactic acid production

Bicker, Markus; Endres, S.; Ott, Lothar; Vogel, Herbert

doi:10.1016/j.molcata.2005.06.017

Cited by 213 publications

(155 citation statements)

References 15 publications

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“…Without any pollution, hydrolysis in subcritical water is environment friendly technology (Cheng et al 2008). Recently growing attention has led to extensive research activities using subcritical water for hydrolysis and conversion of biomass to useful compounds (Yoshida et al 1999;Kruse and Gawlik 2003;Bicker et al 2005;Tavakoli and Yoshida 2006;Salak Asghari and Yoshida 2007;Uddin et al 2010). The thermal protein hydrolysis is gaining in importance in economical as well as ecological aspects.…”

Section: Introductionmentioning

confidence: 99%

Recovery of functional materials with thermally stable antioxidative properties in squid muscle hydrolyzates by subcritical water

Asaduzzaman

Chun

2013

J Food Sci Technol

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Subcritical water hydrolysis was carried out to produce functional materials from squid muscle using a batch reactor. The reaction temperatures and pressures for hydrolysis of thermal dried squid muscle were maintained from 160 to 280°C and 6 to 66 bar for 3 min. The ratio of material to water for hydrolysis was 1:25 (w/v) and it was stirred at 140 rpm. Hydrolysis yield was increased after increasing the temperature and pressure while the protein in hydrolyzate decreased with the rise of temperature. The reducing sugar yield was high at temperature 220°C in subcritical water hydrolysis of squid muscle. Low molecular weight peptides were found in all hydrolyzates by SDS-PAGE. The highest yield of free and structural amino acid in hydrolyzate was 421.53±1.24 and 380.58±2.25 mg/100 g, respectively at 250°C. All essential amino acids were identified in muscle hydrolyzates and it was high at 220°C. Among the essential amino acids, leucine was the most abundant. Antioxidative properties were found in all hydrolyzates and it was high at 220°C. More than 98±0.26 % ABTS antioxidant activity was retained in hydrolyzates after long time heat treatment.

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Section: Introductionmentioning

confidence: 99%

Recovery of functional materials with thermally stable antioxidative properties in squid muscle hydrolyzates by subcritical water

Asaduzzaman

Chun

2013

J Food Sci Technol

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“…In particular, lactic acid has received much attention as a monomer for the production of biodegradable plastics [8][9][10]19,20 . Currently, lactic acid is primarily produced by the fermentation of glucose.…”

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confidence: 99%

Chemical synthesis of lactic acid from cellulose catalysed by lead(II) ions in water

et al. 2013

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The direct transformation of cellulose, which is the main component of lignocellulosic biomass, into building-block chemicals is the key to establishing biomass-based sustainable chemical processes. Only limited successes have been achieved for such transformations under mild conditions. Here we report the simple and efficient chemocatalytic conversion of cellulose in water in the presence of dilute lead(II) ions, into lactic acid, which is a high-value chemical used for the production of fine chemicals and biodegradable plastics. The lactic acid yield from microcrystalline cellulose and several lignocellulose-based raw biomasses is 460% at 463 K. Both theoretical and experimental studies suggest that lead(II) in combination with water catalyses a series of cascading steps for lactic acid formation, including the isomerization of glucose formed via the hydrolysis of cellulose into fructose, the selective cleavage of the C3-C4 bond of fructose to trioses and the selective conversion of trioses into lactic acid.

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“…The catalytic species showed selectivity towards the formation of glucose, fructose, 5-(hydroxymethyl)furan-2-carbaldehyde (HMF), organic acids (lactic and formic acids) and traces of the cellobiose, 1,6-anhydroglucose, glyceraldehydes, and sorbitol. Note that glucose can also be converted to fructose by isomerisation and HMF can be obtained by the dehydration of hexoses (Girisuta et al, 2007;Corma et al, 2007), while the resulting HMF can be rehydrated to organic acids (Bicker et al, 2005). The doped catalysts promoted an increase in the glucose selectivity, which can be associated with the formation of weak acid sites, as shown by the NH 3 -TPD measurements.…”

Section: Methodsmentioning

confidence: 87%

Microwave hydrothermal synthesis, characterisation, and catalytic performance of Zn1−x MnxO in cellulose conversion

et al. 2014

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Wurtzite-type Zn1−xMnxO (x = 0, 0.03, 0.05, 0.07) nanostructures were successfully synthesised using a simple microwave-assisted hydrothermal route and their catalytic properties were investigated in the cellulose conversion. The morphology of the nanocatalysts is dopant-dependent. Pure ZnO presented multi-plate morphology with a flower-like shape of nanometric sizes, while the Zn0.97Mn0.03O sample is formed by nanoplates with the presence of spherical nanoparticles; the Zn0.95Mn0.05O and Zn0.93Mn0.07O samples are mainly formed by nanorods with the presence of a small quantity of spherical nanoparticles. The catalyst without Mn did not show any catalytic activity in the cellulose conversion. The Mn doping promoted an increase in the density of weak acid sites which, according to the catalytic results, favoured promotion of the reaction.

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Catalytical conversion of carbohydrates in subcritical water: A new chemical process for lactic acid production

Cited by 213 publications

References 15 publications

Recovery of functional materials with thermally stable antioxidative properties in squid muscle hydrolyzates by subcritical water

Recovery of functional materials with thermally stable antioxidative properties in squid muscle hydrolyzates by subcritical water

Chemical synthesis of lactic acid from cellulose catalysed by lead(II) ions in water

Microwave hydrothermal synthesis, characterisation, and catalytic performance of Zn1−x MnxO in cellulose conversion

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