scholarly journals A Low-Molecular Weight Maillard Pigment from Beer was Identified as Perlolyrine, a Maillard Reaction Product from Tryptophan

2019 ◽  
Vol 25 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Chieri Nagai ◽  
Kyoko Noda ◽  
Akari Kirihara ◽  
Yuko Tomita ◽  
Masatsune Murata
Keyword(s):  
Molecular Weight ◽  
Maillard Reaction ◽  
Low Molecular Weight ◽  
Maillard Reaction Product

Inhibition of Maillard reaction in production of low-molecular-weight chitosan by enzymatic hydrolysis

2020 ◽  
Vol 236 ◽  
pp. 116059
Author(s):  
Jun Zhang ◽  
Zewen Mei ◽  
Xingxi Huang ◽  
Yueyue Ding ◽  
Yunxiang Liang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Enzymatic Hydrolysis ◽  
Maillard Reaction ◽  
Low Molecular Weight ◽  
Low Molecular Weight Chitosan

Browning of Maillard reaction systems containing xylose and 4-hydroxy-5-methyl-3(2H)-furanone

2020 ◽  
Vol 85 (2) ◽  
pp. 401-410
Author(s):  
Miki Nakamura ◽  
Yoko Mikami ◽  
Kyoko Noda ◽  
Masatsune Murata
Keyword(s):  
Molecular Weight ◽  
Maillard Reaction ◽  
Degradation Product ◽  
Decomposition Product ◽  
Low Molecular Weight ◽  
Plant Origin ◽  
Reaction Systems

ABSTRACT Pentose is involved in the browning through the Maillard reaction of food derived of plant origin. During research on the Maillard reaction between xylose (Xyl) and lysine (Lys), we detected 4-hydroxy-5-methyl-3(2H)-furanone (HMFO) as a major decomposition product of Xyl. To clarify the chemical pathway of the browning of pentose system, the formation and decomposition of dicarbonyls from HMFO and Xyl were examined. In the HMFO system, HMFO was oxidatively hydrolyzed to form 2-hydroxy-3,4-dioxopentanal, which leads to the formation of methylglyoxal (MGO) and then diacetyl (DA). In the Xyl system, MGO was also the major dicarbonyl degradation product from 1-deoxyxylosone (1-DX). Among Xyl, HMFO, MGO, and DA, MGO turned brown most rapidly in the presence of Lys and formed melanoidin-like brown pigments. In the Xyl system, MGO derived from HMFO and 1-DX most contributed to the browning, although some low-molecular-weight pigments, a colorless polymer, and fluorescent substances were also formed.

scholarly journals Effect of Hydroxymethylfurfural and Low-Molecular-Weight Chitosan on Formation of Acrylamide and Hydroxymethylfurfural during Maillard Reaction in Glucose and Asparagine Model Systems

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1901
Author(s):  
Hong-Ting Victor Lin ◽  
Der-Sheng Chan ◽  
Ling-Yu Kao ◽  
Wen-Chieh Sung
Keyword(s):  
Molecular Weight ◽  
Maillard Reaction ◽  
Kinematic Viscosity ◽  
Model Systems ◽  
Low Molecular Weight ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
All Solutions ◽  
Low Molecular Weight Chitosan ◽  
Food Model

The aim of this research was to investigate the effects of the addition of 0.5% hydroxymethylfurfural (HMF) and low molecular chitosan on acrylamide and HMF formation in a food model system, which contains 0.5% glucose, asparagine, and HMF within 30 min of heating at 180 °C. At an interval of 10 min, all solutions were evaluated in the following aspects: reducing sugar, asparagine, acrylamide, HMF content, pH, Maillard reaction products, kinematic viscosity, and color. After heating for 10 min, the kinematic viscosity of solutions containing chitosan reduced significantly. The values of the acrylamide, HMF, and absorbance increased at OD294 and OD420 (optical density measured at 294 nm and 420 nm) of solutions. Experimental results showed that low-molecular-weight chitosan might be hydrolyzed into much lower molecular weight, followed by the decrease in kinematic viscosity of the solution at pH lower than 6 and the increase in the formation of acrylamide after heating for 30 min.

A high-performance oil-free backing pump for electron microscopes

1978 ◽  
Vol 36 (1) ◽  
pp. 110-111
Author(s):  
G.K.W. Balkau ◽  
E. Bez ◽  
J.L. Farrant
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Hot Spots ◽  
High Performance ◽  
Carbonaceous Material ◽  
Contamination Rate ◽  
Low Molecular Weight ◽  
Principal Source ◽  
Rotary Pumps ◽  
Electron Microscopes

The earliest account of the contamination of electron microscope specimens by the deposition of carbonaceous material during electron irradiation was published in 1947 by Watson who was then working in Canada. It was soon established that this carbonaceous material is formed from organic vapours, and it is now recognized that the principal source is the oil-sealed rotary pumps which provide the backing vacuum. It has been shown that the organic vapours consist of low molecular weight fragments of oil molecules which have been degraded at hot spots produced by friction between the vanes and the surfaces on which they slide. As satisfactory oil-free pumps are unavailable, it is standard electron microscope practice to reduce the partial pressure of organic vapours in the microscope in the vicinity of the specimen by using liquid-nitrogen cooled anti-contamination devices. Traps of this type are sufficient to reduce the contamination rate to about 0.1 Å per min, which is tolerable for many investigations.

Low-molecular-weight heparin in the prevention and treatment of thromboembolic disorders

1998 ◽  
Vol 1 (5) ◽  
pp. 166-174 ◽  
Author(s):  
Evelyn R Hermes De Santis ◽  
Betsy S Laumeister ◽  
Vidhu Bansal ◽  
Vandana Kataria ◽  
Preeti Loomba ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight Heparin ◽  
Low Molecular Weight ◽  
Prevention And Treatment

Low-Molecular-Weight Heparin May Aid Acute MI

2005 ◽  
Vol 35 (5) ◽  
pp. 19 ◽  
Author(s):  
MITCHEL L. ZOLER
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight Heparin ◽  
Low Molecular Weight ◽  
Acute Mi
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