Studies on the lignin of Eucalyptus regnans F. Muell. VII. The acid hydrolysis of ethanyol lignin-A

Ethanol lignin-A from the ethanolysis of Eucalyptus regnans P. Muell. has been hydrolysed with dilute hydrochloric acid with the object of ascertaining whether the combined ethoxyl is present as an acetal or as ether. Hydrolysis with 12 per cent. hydrochloric acid was found to split off one ethoxyl group, while hydrolysis with 20 per cent. acid brought about complete de-ethylation. The de-ethylated ethanol lignin-A contained one carbonyl group less and two hydroxyl groups more than the original ethanol lignin-A. These results lend no support to the hypothesis that alcohol lignins are acetals, and favour the theory that the combined alkoxyl is probably present as ether.

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Hydrolysis of Phosphopeptides. I. Acid Hydrolysis of O-Phosphoryl-DL-serylglycine and Glycyl(O-phosphoryl)-DL-Serine. Sequence Inversion in Dilute Hydrochloric Acid.

Acta Chemica Scandinavica ◽

10.3891/acta.chem.scand.14-0625 ◽

1960 ◽

Vol 14 ◽

pp. 625-633 ◽

Cited By ~ 4

Author(s):

Georg Fölsch ◽

Olof Mellander ◽

Lars Strid ◽

Susanne Refn ◽

Gertrud Westin

Keyword(s):

Hydrochloric Acid ◽

Acid Hydrolysis ◽

Dilute Hydrochloric Acid ◽

Sequence Inversion ◽

Hydrolysis Of

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Acid and Enzymatic Hydrolyses of Rice Bran for Bioethanol Production

ALCHEMY ◽

10.18860/al.v6i1.6767 ◽

2018 ◽

Vol 6 (1) ◽

pp. 24

Author(s):

Dewi Yuliani ◽

Khoirul Achmad Julianto ◽

Akyunul Jannah

Keyword(s):

Enzymatic Hydrolysis ◽

Hydrochloric Acid ◽

Acid Hydrolysis ◽

Sulphuric Acid ◽

Rice Bran ◽

Dilute Hydrochloric Acid ◽

Cellulolytic Enzyme ◽

Bioethanol Production ◽

By Products ◽

Sugar Source

Rice bran is one among many agricultural by-products containing ~50-60 wt.% of carbohydrate. The carbohydrate is a prominent sugar source for bioethanol production. The objective of this research was to study bioethanol production from rice bran by acid and enzymatic treatment. The variations of acid used were dilute hydrochloric acid and sulphuric acid, while variations of enzyme used were amylolytic and cellulolytic enzyme. Ethanol production of acid-hydrolyzed rice bran was 24.95±1.61% (v/v) by hydrochloric acid and 29.57±2.04% (v/v) by sulphuric acid. Ethanol produced by enzymatic hydrolysis was quite low i.e. 6.7±0.04%, and 8.86±0.29% (v/v) for amylolytic and cellulolytic hydrolysate, respectively. Keywords: Bioethanol, rice bran, acid hydrolysis, enzymatic hydrolysis

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Hydrochloric acid hydrolysis of bromazepam. Identification and relevance of some additional products

Pharmaceutisch Weekblad ◽

10.1007/bf02112351 ◽

1982 ◽

Vol 4 (1) ◽

pp. 12-15 ◽

Cited By ~ 1

Author(s):

M. M. A. de Bruyne ◽

A. Sinnema ◽

A. M. A. Verweij

Keyword(s):

Hydrochloric Acid ◽

Acid Hydrolysis ◽

Hydrolysis Of

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Structure of the extracellular bacterial polysaccharide from Arthrobacter viscosus NRRL B-1973

Canadian Journal of Chemistry ◽

10.1139/v68-552 ◽

1968 ◽

Vol 46 (21) ◽

pp. 3353-3361 ◽

Cited By ~ 40

Author(s):

J. H. Sloneker ◽

Danute G. Orentas ◽

C. A. Knutson ◽

P. R. Watson ◽

Allene Jeanes

Keyword(s):

Acid Hydrolysis ◽

Linear Structure ◽

Sugar Residue ◽

Hydroxyl Groups ◽

Bacterial Polysaccharide ◽

Sodium Metaperiodate ◽

Mannuronic Acid ◽

Arthrobacter Viscosus ◽

Hydrolysis Of

D-Glucose, D-galactose, and D-mannuronic acid in equimolar proportions constitute 75% of the weight of the polysaccharide elaborated by Arthrobacter viscosus NRRL B-1973. O-Acetyl groups account for the remaining 25% of the weight; 50% of the hydroxyl groups are acetylated. Acid hydrolysis of the polysaccharide revealed that the D-mannopyranosyluronic acid bonds hydrolyzed with unexpected ease. Controlled acid hydrolysis afforded three oligosaccharides identified as 4-O-β-D-glucopyranosyl-D-galactose; 4-O-β-D-mannopyranosyluronic acid-D-glucose; and O-β-D-mannopyranosyluronic acid-(1 → 4)-O-β-D-glucopyranosyl-(1 → 4)-D-galactose. The native polysaccharide was oxidized slowly by sodium metaperiodate and consumed 0.42 mole per sugar residue in 340 h at 4°. The deacetylated polysaccharide consumed 0.67 mole of periodate per sugar residue and produced 1 mole of acid per 160 to 165 sugar residues in 170 h at 4°. At 20° the deacetylated polysaccharide was oxidized excessively by periodate, 1.5 moles of oxidant was consumed, and 0.4 mole of acid was produced per sugar residue in 340 h. However, only 20% of the C4-substituted D-glucose residues in the polysaccharide was cleaved by periodate in spite of the excessive oxidation at 20°.The polysaccharide has a linear structure and consists predominantly of repeating trisaccharide units, O-β-D-mannopyranosyluronic acid-(1 → 4)-O-β-D-glucopyranosyl-(1 → 4)-D-galactose.

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4-Chloropyridine-3-sulfonic acid

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s1600536806009585 ◽

2006 ◽

Vol 62 (4) ◽

pp. o1490-o1491

Author(s):

Xin-Biao Mao ◽

Tie-Han Li ◽

Chun-An Ma ◽

Qing-Bao Song

Keyword(s):

Crystal Structure ◽

Hydrochloric Acid ◽

Hydrogen Bonds ◽

Sulfonic Acid ◽

Dilute Hydrochloric Acid ◽

Two Dimensional ◽

One Dimensional ◽

Compound C ◽

Dimensional Network ◽

Hydrolysis Of

The title compound, C5H4ClNO3S, was obtained by hydrolysis of 4-chloropyridine-3-sulfonamide in dilute hydrochloric acid. In the crystal structure, one-dimensional chains are formed via N—H...O hydrogen bonds. In addition, weak C—H...Cl hydrogen bonds link these chains into a two-dimensional network

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Acid Hydrolysis of Phenylthiohydantoins of Amino Acids

Australian Journal of Biological Sciences ◽

10.1071/bi9711247 ◽

1971 ◽

Vol 24 (4) ◽

pp. 1247 ◽

Cited By ~ 34

Author(s):

AS Inglis ◽

PW Nicholls ◽

CM Roxburgh

Keyword(s):

Amino Acids ◽

Hydrochloric Acid ◽

Thin Layer ◽

Acid Hydrolysis ◽

Free Amino ◽

Hydriodic Acid ◽

Ultraviolet Spectroscopy ◽

Quantitative Identification ◽

Layer Chromatography ◽

Hydrolysis Of

The phenylthiohydantoins (PTHs) derived from amino acids were hydrolysed in boiling hydriodic acid for 24 hr. Good yields of free amino acids were obtained for all PTH derivatives except methionine. In contrast to hydrolysis with hydrochloric acid, hydrolysis with hydriodic acid converts PTH-threonine, PTH-serine, and PTH-tryptophan respectively to oc-amino-n-butyric acid, alanine, and a mixture (approx. 2: 1) of glycine and alanine. This procedure provides a useful adjunct to thin-layer chromatography and ultraviolet spectroscopy for quantitative identification of the PTH derivative.

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