Hyphenated Technique - Thermogravimetry-Differential Scanning Colorimetry Coupled to Mass Spectroscopy| Chapter 4 | Research Highlights in Science and Technology Vol. 4

 A thermo-examining approach which is known as thermogravimetric reasoning uses weight changes that occur whena sample is warmed to a consistent pace to confirm a material thermal balance & percentage of the doubtful additives present. DSC analysis is secondhand for measuringa variety of quantities, including softening temperature, hidden melting warmth, melding warmth, reaction capacity, and many more.Mass spectrophotometry is a potent analytical finish containing abundant uses in the biomedical & pharmaceutical industries. A maneuver's increased sensitivity and judgment have opened up new avenues for the test of prescribed medications and complex basic structure metabolites. The synthetic properties and thermal balance of plant-based polymers isolated from chemically singular soils were revealed using thermogravimetry as well DSC, quadrupole mass spectrometry, and added techniques. TGA/DSC, when used together along with MS, isolates several ions from the pattern substitute in accordance with a specific bulk-to-charge ratio.The connected instrument is used to evaluate the powder covering's physical characteristics and shame balance while also identifying basic components.

Author(s) Details:

K. Bhavyasri,
Department of Pharmaceutical Analysis, RBVRR Women’s College of Pharmacy, Barkatpura, Hyderabad-500027, India.

Please see the link here: https://stm.bookpi.org/RHST-V4/article/view/10910

Bis(4-alkoxyphenyl) Viologen Bis(triflimide) Salts: Synthesis, Thermotropic Liquid-crystalline and Light-emitting Properties | Chapter 3 | Current Topics on Chemistry and Biochemistry Vol. 2

 Extended viologens with various organic counterions are a type of ionic liquid crystal that combines the characteristics of ionic liquids and liquid crystals. We provide a set of extended viologens with similar features in this paper. The metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were prepared from the reaction of Zincke salt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol, yielded a series of bis(4-alkoxyphenyl) viologen bis(triflimide) salts with alkoxy chains of various lengths. Nuclear Magnetic Resonance spectra for 1H and 13C, as well as elemental analyses, were used to determine their chemical structures. Differential scanning calorimetry, polarised optical microscopy, and variable temperature X-ray diffraction were used to investigate their thermotropic liquid-crystalline (LC) characteristics. Crystal-to-liquid transitions were seen in salts with short alkoxy chains. Both crystal-to-SmA and SmA-to-isotropic transitions, Tms and Tis, were seen in salts of intermediate length alkoxy chains. Those with long alkoxy chains had lower Tms, which allowed them to form SmA phases that lasted until decomposition at high temperatures. In the temperature range of 330-370 C, they all showed outstanding thermal stabilities, as expected. In addition, their light-emitting capabilities in methanol were taken into account.

Author(s) Details:

Pradip K. Bhowmik,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Mohammed Kareem M. Al-Karawi,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Shane T. Killarney,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Erenz J. Dizon,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Anthony Chang,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Jongin Kim,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Si L. Chen,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Ronald Carlo G. Principe,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Andy Ho,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Haesook Han,
Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154-4003, USA.

Hari D. Mandal,
Department of Biology and Chemistry, Texas A & M International University, 5201 University Blvd., Laredo, TX 78041, USA.

Raymond G. Cortez,
Department of Biology and Chemistry, Texas A & M International University, 5201 University Blvd., Laredo, TX 78041, USA.

Bryan Gutierrez,
Department of Biology and Chemistry, Texas A & M International University, 5201 University Blvd., Laredo, TX 78041, USA.

Klarissa Mendez,
Department of Biology and Chemistry, Texas A & M International University, 5201 University Blvd., Laredo, TX 78041, USA.

Lewis Sharpnack,
Department of Earth Science, 1006 Webb Hall, University of California, Santa Barbara, CA 93106, USA.

Dena M. Agra-Kooijman,
Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, OH 44242, USA.

Michael R. Fisch,
College of Aeronautics and Engineering, Kent State University, Kent, OH 44242, USA.

Satyendra Kumar,
Division of Research, University at Albany, Albany, NY 12222, USA.

Please see the link here: https://stm.bookpi.org/CTCB-V2/article/view/7130

Bucillamine as An Efficient H Atom Donor Protects High-Molar-Mass Hyaluronan from Oxidative Degradation by Effective Scavenging of Free Radicals

 Bucillamine has been shown to preserve high-molecular-mass hyaluronan from degradation caused by a free-radical-generating system containing cupric ions and ascorbate. We adopted a multimodal strategy in this investigation, employing a range of methodologies such as non-isothermal chemiluminometry, thermogravimetry, and differential scanning calorimetry to characterise the hyaluronan fragments produced.

Bucillamine was found to significantly slow the oxidative degradation of high-molar-mass hyaluronan in our tests. The results, particularly the decrease in chemiluminescence intensity and removal of the differential scanning calorimetry exotherm (at 270oC) for hyaluronan fragments, may indicate the need for more research into the mechanism(s) of action of bucillamine in this process.

Author (s) Details

Katarína Valachová
Centre of Experimental Medicine, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.

Jozef Rychlý
Polymer Institute, Slovak Academy of Sciences, SK-84541 Bratislava, Slovakia.

Ivica Janigová
Polymer Institute, Slovak Academy of Sciences, SK-84541 Bratislava, Slovakia.

Katarína Csomorová
Polymer Institute, Slovak Academy of Sciences, SK-84541 Bratislava, Slovakia.

Ivo Juránek
Centre of Experimental Medicine, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.

Ladislav Šoltés
Centre of Experimental Medicine, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.

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