scholarly journals INFLUENCE OF SOME ORGANIC COMPOUNDS UPON THE HYDROLYSIS OF STARCH BY SALIVARY AND PANCREATIC AMYLASES

1922 ◽  
Vol 44 (12) ◽  
pp. 2957-2966 ◽  
Author(s):  
H. C. Sherman ◽  
Nellie M. Naylor
Keyword(s):  
Organic Compounds ◽  
Hydrolysis Of

INCORPORATION OF IODIDE INTO ORGANIC COMPOUNDS IN THE GUINEA PIG THYROID

1963 ◽  
Vol 43 (1) ◽  
pp. 110-118 ◽  
Author(s):  
R. Ekholm ◽  
T. Zelander ◽  
P.-S. Agrell
Keyword(s):  
Guinea Pig ◽  
Protein Binding ◽  
Organic Compounds ◽  
Guinea Pigs ◽  
Microsomal Fraction ◽  
Thyroid Tissue ◽  
Particulate Fraction ◽  
Supernatant Fraction ◽  
Hydrolysis Of

ABSTRACT Guinea pigs, kept on a iodine-sufficient diet, were injected with Na131I and the thyroids excised from 45 seconds to 5 days later. The thyroid tissue was homogenized and separated into a combined nuclear-mitochondrial-microsomal fraction and a supernatant fraction by centrifugation at 140 000 g for one hour. Protein bound 131iodine (PB131I) and free 131iodide were determined in the fractions and the PB131I was analysed for monoiodotyrosine (MIT), diiodotyrosine (DIT) and thyroxine after hydrolysis of PB131I. As early as only 20 minutes after the Na131I-injection almost 100% of the particulate fraction 131I was protein bound. In the supernatant fraction the protein binding was somewhat less rapid and PB131I values above 90% of total supernatant 131I were not found until 3 hours after the injection. In all experiments the total amount of PB131I was higher in the supernatant than in the corresponding particulate fraction. The ratio between supernatant PB131I and pellet PB131I was lower in experiments up to 3 minutes and from 2 to 5 days than in experiments of 6 minutes to 20 hours. Hydrolysis of PB131I yielded, even in the shortest experiments, both MIT and DIT. The DIT/MIT ratio was lower in the experiments up to 2 hours than in those of 3 hours and over.

Vegetables as biocatalysts in stereoselective hydrolysis of labile organic compounds

2009 ◽  
Vol 11 (11) ◽  
pp. 1900 ◽  
Author(s):  
Björn Bohman ◽  
L. R. Cavonius ◽  
C. Rikard Unelius
Keyword(s):  
Organic Compounds ◽  
Stereoselective Hydrolysis ◽  
Hydrolysis Of

Photocatalytic Activity of Mixed Phase TiO2 from Microwave-Assisted Synthesis

2013 ◽  
Vol 664 ◽  
pp. 661-666 ◽  
Author(s):  
Nuchanaporn Pijarn ◽  
Sirithan Jeimsirilers ◽  
Supatra Jinawath
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Organic Compounds ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Bacteria And Fungi ◽  
Hydrolysis Of

Photocatalyst is an environmental clean-up material when exposed to light. It can decompose organic compounds, bacteria and fungi as well as foul odors. Titanium dioxide (TiO2) has long been well known for its powerful photocatalytic activity. However, its properties depend on several factors and synthesis method is one of them. In this work, TiO2powders were prepared by three methods, namely microwave-assisted hydrolysis of titanium oxysulfate (TiOSO4), hydrolysis of TiOSO4, and also by calcining of TiOSO4. Photocatalytic activity of the obtained TiO2powders were evaluated through the decomposition of methylene blue in comparison with P25 (Degussa). Results showed that the TiO2prepared at conditions of microwave 100 watts, irradiation time of 10 min was most effective when compared with the others in this work.

scholarly journals Functionalization of polyhydromethylsiloxane with nitrogen-containing organic compounds

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Maria Owińska ◽  
Aleksandra Chechelska-Noworyta ◽  
Zbigniew Olejniczak ◽  
Magdalena Hasik
Keyword(s):  
Nmr Spectroscopy ◽  
Ftir Spectroscopy ◽  
Organic Compounds ◽  
Elemental Analysis ◽  
Functionalized Polymers ◽  
Cross Linking ◽  
Hydrosilylation Reaction ◽  
Silanol Groups ◽  
Mild Conditions ◽  
Hydrolysis Of

AbstractLinear polyhydromethylsiloxane (PHMS) was functionalized with nitrogen-containing organic compounds: N-allylaniline (Naa), N-allylcyclohexylamine (Nach), N-allylpiperidine (Nap) and 4-vinylpyridine (4VP) via hydrosilylation reaction in the presence of Pt0 complex (Karstedt’s catalyst) under mild conditions. Reaction course was followed by FTIR spectroscopy and final hydrosilylation products were characterized by FTIR, 1H, 29Si NMR and 29Si MAS-NMR spectroscopies as well as by elemental analysis. Results showed that functionalization of PHMS with N-allyl amines took place but in none of the systems it was complete. Hydrosilylation of Naa, Nach and Nap with PHMS led both, to the β and α addition products. 29Si NMR spectroscopy showed unequivocally that the reaction of PHMS with 4VP did not occur and the only reactions in the systems were hydrolysis of Si–H groups of PHMS followed by condensation of the silanol groups resulting in cross-linking of the polymer. All the functionalized polymers studied in the work contained reactive amine moieties prone to further modifications, therefore exhibit a great potential for various applications.

scholarly journals Strength Study of Sorption Composites Based on Microfine Glass Fibers

2020 ◽  
pp. 221-227
Author(s):  
В.К. Дубовый ◽  
Г.А. Суслов
Keyword(s):  
Composite Material ◽  
Organic Compounds ◽  
Glass Fibers ◽  
Aluminium Chloride ◽  
Polynuclear Complexes ◽  
Aluminium Sulfate ◽  
Low Concentrations ◽  
The Impact ◽  
Hydrolysis Of ◽  
Technological Strength

Исследуется влияние минерального и органического связующего на термостойкость и показатель разрушающего усилия композиционных сорбционных материалов на основе стеклянных волокон. Рассматриваемый материал используется для сорбции органических соединений при низких концентрациях. Изучение влияния на эти два показателя вызвано тем, что материал, описываемый в настоящей статье, требует определенной технологической прочности и должен выдерживать температуры 300 °С. Для достижения требуемых параметров для материала исследовались три типа связующего: 1. Полиядерные комплексы алюминия, полученные в результате гидролиза хлорида алюминия; 2. Полиядерные комплексы алюминия, полученные в результате гидролиза сульфата алюминия; 3. Сульфатная небеленая целлюлоза. По результатам исследования было выявлено наиболее подходящее связующее для сорбционного композиционного материала и определено оптимальное процентное содержание этого связующего. Discusses the influence of mineral and organic binders on the heat resistance and the index of the destructive force of composite sorption materials based on glass fibers. This material is used for sorption of organic compounds at low concentrations. Consideration of the impact on these two indicators is caused by the fact that the material described in this article requires a certain technological strength and must withstand temperatures of 300 °C. To achieve the required parameters for the material, three types of binder were studied: 1. Polynuclear complexes of aluminium, obtained by hydrolysis with aluminium chloride; 2. Polynuclear complexes of aluminium, obtained by hydrolysis of aluminium sulfate; 3. Sulfate unbleached cellulose. According to the results of the study, the most suitable binder for the sorption composite material was identified and the optimal percentage of this binder was determined.

scholarly journals Development of a fluorogenic small substrate for dipeptidyl peptidase-4

2017 ◽  
Vol 13 ◽  
pp. 2690-2697 ◽  
Author(s):  
Futa Ogawa ◽  
Masanori Takeda ◽  
Kanae Miyanaga ◽  
Keita Tani ◽  
Ryuji Yamazawa ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Organic Compounds ◽  
Reaction Medium ◽  
Dipeptidyl Peptidase ◽  
Fluorogenic Substrate ◽  
Fluorometric Determination ◽  
Dipeptidyl Peptidase 4 ◽  
Fluorogenic Probes ◽  
Hydrolysis Of

A series of aniline and m-phenylenediamine derivatives with electron-withdrawing 3,3,3-trifluoropropenyl substituents were synthesized as small and chemically stable fluorescent organic compounds. Their fluorescence performances were evaluated by converting 2,4-disubstituted aniline 1 to the non-fluorescent dipeptide analogue H-Gly-Pro-1 for the use as a fluorogenic substrate for dipeptidyl peptidase-4 (DPP-4). The progress of the enzymatic hydrolysis of H-Gly-Pro-1 with DPP-4 was monitored by fluorometric determination of 1 released into the reaction medium. The results suggest that 1 could be used as fluorophore in OFF–ON-type fluorogenic probes.

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