scholarly journals Partial reversal of the acetaldehyde and butyraldehyde oxidation reactions catalysed by aldehyde dehydrogenases from sheep liver

1978 ◽  
Vol 175 (2) ◽  
pp. 753-756 ◽  
Author(s):  
G J Hart ◽  
F M Dickinson
Keyword(s):  
Acetic Anhydride ◽  
Mitochondrial Enzyme ◽  
Oxidation Reactions ◽  
Aldehyde Dehydrogenases ◽  
Cytoplasmic Enzyme ◽  
Sheep Liver ◽  
Michaelis Constants ◽  
Butyric Anhydride ◽  
Partial Reversal

In the presence of acetic anhydride or butyric anhydride, liver aldehyde dehydrogenases catalyse the oxidation of NADH at pH 7.0 and 25 degrees C. The maximum velocities and Michaelis constants for NADH at saturating anhydride concentrations are independent of which anhydride is used, the values being V′max. = 12 min-1 and Km for NADH = 9 micrometer for the mitochondrial enzyme and V′max = 25 min-1 and Km for NADH = 20 micrometer for the cytoplasmic enzyme. Substitution of [4A-2H]NADH for NADH resulted in 2-fold and 4-fold decreases in rate for the mitochondrial and cytoplasmic enzymes respectively.

scholarly journals Butyration of Lignosulfonate with Butyric Anhydride in the Presence of Choline Chloride

BioResources ◽  
2015 ◽  
Vol 10 (2) ◽  
Author(s):  
Lifen Li ◽  
Yingcheng Hu ◽  
Fangchao Cheng
Keyword(s):  
Choline Chloride ◽  
Butyric Anhydride

scholarly journals Production of Butyric Anhydride Using Single Reactive Distillation Column with Internal Material Circulation

Processes ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
Guanghui Chen ◽  
Fushuang Jin ◽  
Xiaokai Guo ◽  
Shuguang Xiang ◽  
Shaohui Tao
Keyword(s):  
Acetic Anhydride ◽  
Butyric Acid ◽  
Distillation Column ◽  
Reactive Distillation ◽  
Reaction System ◽  
Total Annual Cost ◽  
Material Circulation ◽  
Butyric Anhydride ◽  
Better Than ◽  
Column Process

The traditional two-column reactive distillation (RD) process is used for the production of butyric anhydride, which is synthesized with butyric acid and acetic anhydride via a reversible reaction. In this work, a novel process with a single RD column (SRDC) is designed for the production of butyric anhydride, where the second distillation column for separating excess reactant is removed based on the boiling point profile of the reaction system. Two applications of the proposed SRDC process, namely SRDC with excess butyric acid or acetic anhydride circulating internally, are economically optimized, and the results show that both SRDC processes have a lower total annual cost (TAC) than the traditional two-column process. Furthermore, from the perspective of TAC, the application with an excess feed of butyric acid is better than the application with excess acetic anhydride. The developed technique may also be applied to retrofit other traditional two-column RD processes, where the overhead and bottom products are the lightest and heaviest components of the reaction system, respectively, and no azeotrope is involved in the RD column.

scholarly journals Effect of Linear Chain Carboxylic Acid Anhydrides on Physical and Mechanical Properties of Rubber (Hevea brasiliensis), Acacia, (Acacia spp.), and Oil Palm (Tinnera spp.) Woods

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Mohd Afiq Mohtar ◽  
Norul Hisham Hamid ◽  
Mohd Hamami Sahri
Keyword(s):  
Mechanical Properties ◽  
Oil Palm ◽  
Linear Chain ◽  
Untreated Wood ◽  
Physical And Mechanical Properties ◽  
Testing Method ◽  
Rubber Wood ◽  
Acid Anhydrides ◽  
The Impact ◽  
Butyric Anhydride

The physical and mechanical properties of Rubber wood, Acacia wood, and Oil palm wood that reacted with acetic, propionic, and butyric anhydrides using a microwave heating for 4 minutes were investigated. A sample dimension of 300 mm × 100 mm × 25 mm (L×W×T) was used for modification and they were cut into smaller specimens for different testing method. This study found that the density increment and void volume changes were not significantly different from anhydrides. The modification of wood with anhydrides was not significantly affected by the static bending properties, except for the Oil palm. The compression strength for any anhydrides shows an improvement for the Rubber wood and Acacia spp. but not Oil palm. The hardness was also not significantly different from anhydrides for all wood species. The impact strength of Rubber wood and Oil palm significantly increased compared to the untreated wood, but this was not the case for Acacia spp. Generally, the highest improvement in mechanical properties was obtained by modification of Rubber and Acacia woods with butyric anhydride.

Excess enthalpies of (butyric anhydride + n-alkane) at 298.15 K

1988 ◽  
Vol 20 (9) ◽  
pp. 1097-1100 ◽  
Author(s):  
I García ◽  
J.C Cobos ◽  
R Escarda ◽  
C Casanova
Keyword(s):  
Excess Enthalpies ◽  
Butyric Anhydride

scholarly journals Effects of Acid-Anhydride-Modified Cellulose Nanofiber on Poly(Lactic Acid) Composite Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 753
Author(s):  
Naharullah Jamaluddin ◽  
Yu-I Hsu ◽  
Taka-Aki Asoh ◽  
Hiroshi Uyama
Keyword(s):  
Lactic Acid ◽  
Composite Films ◽  
Cellulose Nanofiber ◽  
Hydroxyl Group ◽  
Poly Lactic Acid ◽  
Propionic Anhydride ◽  
Acid Anhydrides ◽  
Surface Modified ◽  
Butyric Anhydride ◽  
Modified Cellulose

In this study, we investigated the effect of the addition of cellulose nanofiber (CNF) fillers on the performance of poly(lactic acid) (PLA). Modification of the hydroxyl group of cellulose to the acyl group by acid anhydrides changed the compatibility of the CNF with PLA. CNF was modified by acetic anhydride, propionic anhydride, and butyric anhydride to form surface-modified acetylated CNF (CNFa), propionylated CNF (CNFp), and butyrylated CNF (CNFb), respectively, to improve the compatibility with the PLA matrix. The effects of the different acid anhydrides were compared based on their rates of reaction in the acylation process. PLA with modified cellulose nanofiber fillers formed smoother surfaces with better transparency, mechanical, and wettability properties compared with the PLA/CNF composite film. The effects of CNFa, CNFp, and CNFb on the PLA matrix were compared, and it was found that CNFp was the best filler for PLA.

Butyric anhydride

2006 ◽  
Author(s):  
Tse-Lok Ho ◽  
Mary Fieser ◽  
Louis Fieser
Keyword(s):  
Butyric Anhydride
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