The degradation of lactose by interaction with casein

1965 ◽  
Vol 18 (9) ◽  
pp. 1471 ◽  
Author(s):  
EL Richards
Keyword(s):  
Lactic Acid ◽  
Phosphoric Acid ◽  
Complex Mixture ◽  
Glycollic Acid

Lactose and casein react to give a complex mixture of sugars and acids from which lactulose, D-galactose, D-tagatose, 5-hydroxymethylfurfural, lactic acid, glycollic acid, phosphoric acid, and the lactones of 2-deoxy-D-glycero-tetronic and 3-deoxy-D-erythro-pentonic acids have been isolated and identified.

Reactions of isomeric oxo-2(3)-oxahomodiamantanes. Dehydration of tetracyclic diols with concentrated phosphoric acid

1990 ◽  
Vol 55 (10) ◽  
pp. 2475-2480 ◽  
Author(s):  
Josef Janků ◽  
Sergei D. Isaev ◽  
Leonid V. Cybulskii ◽  
Luděk Vodička ◽  
Alexander G. Yurchenko
Keyword(s):  
Phosphoric Acid ◽  
Complex Mixture ◽  
Lithium Aluminium Hydride ◽  
Lithium Aluminium ◽  
Sole Product

Reduction of 11-oxo-10-oxapentacyclo[7.4.1.14,13.02,7.06,12]pentadecane (lactone I) and 10-oxo-11-oxapentacyclo[7.4.1.14,13.02,7.06,12]pentadecane (lactone II) with lithium aluminium hydride afforded 4-hydroxymethyl-12-hydroxytetracyclo[7.3.1.02,7.06,11]tridecane (diol III) and 4-hydroxy-12-hydroxymethyltetracyclo[7.3.1.02,7.06,11]tridecane (diol IV). Diol III reacted with concentrated phosphoric acid to give 3-methyltetracyclo[6.4.1.02,6.05,10]tridecanone-9 (V) as practically the sole product. Diol IV afforded a complex mixture of products in which were identified 2-methyl-3-oxadiadamantane (VI; 57%), 10-oxa-2(3)-homodiadamantane (VII; 20%), 3-hydroxydiadamantane (VIII; 3%), diadamantane (X; 7%) and diadamantanone (IX; 2%).

Study on the aqueous solution behavior and extraction mechanism of Nd(iii) in the presence of the complexing agent lactic acid with di-(2-ethylhexyl) phosphoric acid

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64550-64556 ◽  
Author(s):  
Shao-Hua Yin ◽  
Shi-Wei Li ◽  
Feng Xie ◽  
Li-Bo Zhang ◽  
Jin-Hui Peng
Keyword(s):  
Aqueous Solution ◽  
Lactic Acid ◽  
Phosphoric Acid ◽  
Complexing Agent ◽  
Solution Behavior ◽  
Chloride Medium ◽  
Extraction Mechanism

The aqueous solution behavior and extraction mechanism of single Nd(iii) from a chloride medium with di-(2-ethylhexyl) phosphoric acid (D2EHPA, H2A2) in the presence of the complexing agent lactic acid (HLac) have been reported.

The kinetics and mechanism of solvent extraction of Pr(iii) from chloride medium in the presence of two complexing agents with di-(2-ethylhexyl) phosphoric acid

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48659-48664 ◽  
Author(s):  
Shao-Hua Yin ◽  
Shi-Wei Li ◽  
Jin-Hui Peng ◽  
Li-Bo Zhang
Keyword(s):  
Lactic Acid ◽  
Citric Acid ◽  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Interfacial Area ◽  
Kinetics And Mechanism ◽  
Complexing Agents ◽  
Extraction Kinetics ◽  
Chloride Medium ◽  
Kinetics Of

The extraction kinetics of Pr(iii) from chloride medium containing two complexing agents lactic acid (HLac) and citric acid (H3cit) with di-(2-ethylhexyl)phosphoric acid (D2EHPA, H2A2) have been investigated by constant interfacial area cell with lamina flow.

Solutes in sap obtained from supercritical CO2 dewatering of radiata pine sapwood, and a new role of sap cyclitols in brown stain formation during kiln drying of green wood

Holzforschung ◽  
2019 ◽  
Vol 73 (10) ◽  
pp. 947-956
Author(s):  
Robert A. Franich ◽  
Hank Kroese ◽  
Suzanne Gallagher ◽  
Diane Steward ◽  
Ilena Isak
Keyword(s):  
Amino Acids ◽  
Phosphoric Acid ◽  
Chemical Reactions ◽  
Xylem Sap ◽  
Complex Mixture ◽  
Radiata Pine ◽  
Carbon Chain ◽  
Kiln Drying ◽  
Dehydration Reactions ◽  
Maillard Products

Abstract Xylem sap obtained from radiata pine sapwood using a supercritical CO2 (scCO2) dewatering process contained a complex mixture of solutes comprising carbohydrates, amino acids, alkanoic and diterpene acids, neutral diterpenoids, β-sitosterol and cyclitols. Sap also contained free phosphoric acid which is known to catalyse the condensation reactions between glutamic and aspartic amino acids and glucose, galactose and fructose to form Maillard products. When heated these Maillard products lead to the formation of melanoidins, which are partly responsible for the formation of kiln brown stain (KBS) when green radiata pine sapwood is kiln dried. The cyclitols, which are major components in sap, have been shown to undergo phosphoric acid-catalysed dehydration reactions under kiln drying conditions to give methoxyl derivatives of hydroquinone, catechol, resorcinol and O-methylphloroglucinol. These reactive phenols are known to exothermally condense with formaldehyde and could also react with other short carbon chain aldehydes generated during kiln drying. The products of these chemical reactions are extended π-orbital aromatic polymers which are darkly-coloured and would be expected to contribute to KBS. This paper describes the chemistry of sap from radiata pine sapwood using scCO2 dewatering and proposes new theory on KBS formation invoking thermal dehydration and retro Diels-Alder chemical reactions of the sap cyclitols.

scholarly journals The breakdown and resynthesis of phosphagen in frozen and thawed muscles

1931 ◽  
Vol 108 (759) ◽  
pp. 545-552 ◽  
Keyword(s):  
Lactic Acid ◽  
Phosphoric Acid ◽  
Glycogen Breakdown

E. C. Smith (1929) has described the breakdown of glycogen to lactic acid which occurs in muscle as a result of freezing, and the conditions under which resynthesis may occur in the thawed muscle. The present work covers the same ground in respect of the breakdown and resynthesis of phosphagen, and the behaviour of the hexose phosphoric esters and adenyl-pyro-phosphoric acid. Only in the case of phosphagen have important changes been observed. As in the case of glycogen, breakdown of phosphagen occurs in the muscle merely as a result of freezing. The rate of breakdown increases to a maximum at –2⋅6°, the identical temperature at which the breakdown of glycogen is a maximum, and in each case the rate of breakdown falls away to a negligibly small value at –10°.

Synthesis of phosphoric acid-treated sugarcane bagasse cellulose nanocrystal and its thermal properties enhancement for poly(lactic acid) nanocomposites

2018 ◽  
Vol 32 (5) ◽  
pp. 619-634 ◽  
Author(s):  
Ivy Gan ◽  
Wen Shyang Chow
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Phosphoric Acid ◽  
Acid Hydrolysis ◽  
Sugarcane Bagasse ◽  
Photoelectron Spectroscopy ◽  
Chemical Interaction ◽  
Alkaline Treatment ◽  
Poly Lactic Acid ◽  
Xps Characterization

Poly(lactic acid) (PLA) nanocomposites film reinforced with cellulose nanocrystals (CNCs) extracted from sugarcane bagasse fibre (SBF) was prepared by solvent casting method. The CNCs were obtained through alkaline treatment followed by sulphuric acid hydrolysis or phosphoric acid hydrolysis. The aim of this work was to evaluate the feasibility of utilizing phosphoric acid (mild acid) to extract CNC from the SBF. The properties of the CNC were investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The thermal properties of the PLA/CNC nanocomposites were characterized using thermogravimetric analyser (TGA). TEM results demonstrated that the CNC having diameter of 5.5–6.2 nm and length of 235–300 nm. Results from XPS characterization have confirmed the existence of both sulphate group and phosphate group in the H2SO4-treated CNC (S-CNC) and H3PO4-treated CNC (P-CNC). FTIR results indicated that the presence of hydrogen bonding and chemical interaction between PLA and CNC. The thermal stability of PLA/P-CNC-10 is higher than that of PLA/S-CNC-10 nanocomposites attributed to the char formation of P-CNC in the PLA matrix.

Detailed investigation of an electrodialytic process during the separation of lactic acid from a complex mixture

2005 ◽  
Vol 249 (1-2) ◽  
pp. 173-182 ◽  
Author(s):  
Vu Hong Thang ◽  
Werner Koschuh ◽  
Klaus D. Kulbe ◽  
Senad Novalin
Keyword(s):  
Lactic Acid ◽  
Complex Mixture
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