Optical studies of stability and aggregation state of porphyrins in acid aqueous solution

2005 ◽  
Vol 45 (3) ◽  
pp. 175-181
Author(s):  
Irena Šimkienė ◽  
Algirdas Kindurys ◽  
Jurgis Gintautas Babonas ◽  
Valentinas Snitka ◽  
Raminta Rodaitė-Riševičienė ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Optical Studies ◽  
Aggregation State ◽  
Acid Aqueous Solution

scholarly journals Double-Cross-Linked Networks Based on Methacryloyl Mucin

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1706
Author(s):  
Elena Olăreț ◽  
Brîndușa Bălănucă ◽  
Andra Mihaela Onaș ◽  
Jana Ghițman ◽  
Horia Iovu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Chemical Modification ◽  
Structural Modification ◽  
Aqueous Media ◽  
Cross Linking ◽  
Ph Values ◽  
Acid Aqueous Solution ◽  
Reaction Media ◽  
Double Cross

Mucin is a glycoprotein with proven potential in the biomaterials field, but its use is still underexploited for such applications. The present work aims to produce a synthesis of methacryloyl mucin single-network (SN) hydrogels and their double-cross-linked-network (DCN) counterparts. Following the synthesis of the mucin methacryloyl derivative, various SN hydrogels are prepared through the photopolymerization of methacrylate bonds, using reaction media with different pH values. The SN hydrogels are converted into DCN systems via supplementary cross-linking in tannic acid aqueous solution. The chemical modification of mucin is described, and the obtained product is characterized; the structural modification of mucin is assessed through FTIR spectroscopy, and the circular dichroism and the isoelectric point of methacryloyl mucin is evaluated. The affinity for aqueous media of both SN and DCN hydrogels is estimated, and the mechanical properties of the systems are assessed, both at macroscale through uniaxial compression and rheology tests and also at microscale through nanoindentation tests.

scholarly journals Studies on the Stabilities of Thiamine and Its Modified Compounds. IX : Stabilities of Thiamine-O-esters in Acid Aqueous Solution

1968 ◽  
Vol 88 (12) ◽  
pp. 1552-1558
Author(s):  
KUNIHEI INAZU ◽  
SHIGEYO SUNAGAWA ◽  
RYUICHI YAMAMOTO
Keyword(s):  
Aqueous Solution ◽  
Acid Aqueous Solution

scholarly journals Acid aqueous solution treatment method in AZ31 magnesium alloy

2010 ◽  
Vol 60 (3) ◽  
pp. 117-123 ◽  
Author(s):  
Miyoshi Ohara ◽  
Yorinobu Takigawa ◽  
Kenji Higashi
Keyword(s):  
Aqueous Solution ◽  
Magnesium Alloy ◽  
Solution Treatment ◽  
Treatment Method ◽  
Az31 Magnesium Alloy ◽  
Acid Aqueous Solution

A self-healing and multi-responsive hydrogel based on biodegradable ferrocene-modified chitosan

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55133-55138 ◽  
Author(s):  
Ya-Kun Li ◽  
Cheng-Gong Guo ◽  
Liang Wang ◽  
Youqian Xu ◽  
Chen-yang Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
The Self ◽  
Self Healing ◽  
Modified Chitosan ◽  
Acid Aqueous Solution ◽  
External Stimuli

Here, we present a novel and facile method for constructing a self-healing hydrogel with multi-responses to external stimuli via the self-assemble of biodegradable ferrocene-modified chitosan (FcCS) in an acid aqueous solution.

Pervaporation separation of levulinic acid aqueous solution by ZSM ‐5/ PDMS composite membrane

2020 ◽  
Vol 138 (1) ◽  
pp. 49611
Author(s):  
Zongqi Zhang ◽  
Yuanfeng Wu ◽  
Lijing Gao ◽  
Guomin Xiao
Keyword(s):  
Aqueous Solution ◽  
Composite Membrane ◽  
Levulinic Acid ◽  
Acid Aqueous Solution ◽  
Pervaporation Separation

scholarly journals ESR and Optical Studies on the Interaction between Cu(II) and Pepsin

1978 ◽  
Vol 33 (5-6) ◽  
pp. 321-325 ◽  
Author(s):  
L. Sportelli ◽  
H. Neubacher ◽  
W. Lohmann
Keyword(s):  
Aqueous Solution ◽  
Electron Spin Resonance ◽  
Reaction Time ◽  
Conformational Change ◽  
Optical Spectroscopy ◽  
Electron Spin ◽  
Molar Ratio ◽  
Optical Studies ◽  
Spin Resonance

Abstract The interaction of Cu (II) with the protein pepsin has been investigated by means of electron spin resonance (ESR) and optical spectroscopy. Depending on the molar ratio of Cu(II) and pepsin in aqueous solution two different complexes are formed. A third complex can be detected after a reaction time of several days, attributed to a complex with a conformationally changed pepsin. The presence of inhibitors 1,2-epoxy-3-phenoxypropane (EPP) or diazoacetyl-ethylester (DAE) seems to hinder the conformational change. The structure of the three complexes is discussed.

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