Chemometric Processing of Pharmaceutical Essential Oil Fingerprints—Comparison of GC, HPLC, TLC, IR Spectroscopy, and Differential Scanning Calorimetry

2012 ◽  
Vol 95 (3) ◽  
pp. 699-703 ◽  
Author(s):  
Rafał Pietraś ◽  
Robert Skibiński ◽  
Hanna Trębacz ◽  
Anna Gumieniczek
Keyword(s):  
Differential Scanning Calorimetry ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Total Reflectance ◽  
Crucial Step ◽  
Additional Tool ◽  
Reflectance Ftir ◽  
Baseline Removal ◽  
Almost All ◽  
Variance Explained

Abstract Fifteen essential oils of pharmaceutical grade were fingerprinted by five techniques: TLC, GC, HPLC, attenuated total reflectance FTIR spectroscopy, and differential scanning calorimetry (DSC). Denoising and baseline removal was found to be a crucial step for correct comparative analysis. Standardization of the signal was not necessary in the presented case; however, it should be considered and checked in each case. Due to small variance explained by first two principal components (below 50%) and outlying observations, the main analysis was performed by Euclidean dendrograms. It was found that almost all techniques besides DSC find real chemical similarities; however, DSC can be used as an additional tool. The similarities among the five techniques were also compared and discussed.

scholarly journals Pengaruh Bentonit terhadap Pembentukan Fasa Polimorf dan Sifat Termal Membran Hibrida Poliviniliden Fluorida/Bentonit

2021 ◽  
Vol 17 (2) ◽  
pp. 177
Author(s):  
Edi Pramono ◽  
Rosid Eka Mustofa ◽  
Ozi Adi Saputra ◽  
Yulianto Adi Nugroho ◽  
Deana Wahyunigrum ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Phase Formation ◽  
Attenuated Total Reflectance ◽  
Hybrid Membranes ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Total Reflectance ◽  
X Ray

<p>Kajian struktur dan degradasi termal pada membran hibrida poliviniliden fluorida (PVDF)/lempung bentonit (BNT) telah dilakukan. Penelitian ini bertujuan mengetahui pengaruh penambahan BNT terhadap pembentukan fasa PVDF dan sifat termalnya. Membran hibrida PVDF/lempung BNT dibuat dengan metode inversi fasa. Membran yang dihasilkan dikarakterisasi dengan <em>attenuated total reflectance fourier transform infrared</em> (ATR-FTIR), <em>x-ray diffraction</em> (XRD), dan <em>differential scanning calorimetry</em> (DSC). Hasil penelitian menunjukkan membran PVDF/BNT memiliki struktur polimorf PVDF fasa α dan β yang terkonfirmasi dari data FTIR dan XRD. Data DSC menunjukkan penurunan nilai titik leleh (Tm) dengan penambahan BNT, dan dengan rentang suhu pelelehan yang lebih kecil. Kristalisasi PVDF terjadi secara isothermal dan adanya BNT menghasilkan titik kristalisasi (Tc) pada suhu yang lebih tinggi dibandingkan membran PVDF murni. Analisis termal dengan DSC memberikan informasi komprehensif pelelehan dan kristalisasi dari polimorf PVDF pada matriks membran.</p><p id="docs-internal-guid-c92edf53-7fff-cf03-76f3-f207f37c74f5" style="line-height: 1.2; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"><strong>Effect of Bentonite toward Polymorph Phase Formation and Thermal Properties of Polyvinylidene Fluoride/Bentonite Hybrid Membranes. </strong>The study of the structure and thermal properties of PVDF/bentonite (BNT) hybrid membranes has been carried out. This study aims to determine the effect of BNT addition on the phase formation and thermal properties of the PVDF. In this study, PVDF/BNT hybrid membranes were prepared through the phase inversion method. The resulting membrane was characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), x-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed that the PVDF/BNT membrane has a PVDF polymorph structure with α and β phases confirmed by FTIR and XRD data. The DSC data showed that the addition of BNT decrease of the melting point (Tm) and with a smaller melting temperature range. PVDF polymorph crystallization occurs isothermally and the presence of BNT produces a crystallization point (Tc) at a higher temperature than pristine PVDF membrane. Thermal analysis with DSC provides comprehensive information on melting and crystallization of PVDF polymorphs in the membrane matrix.</p>

Fabrication and characterization of chitosan/gelatin/thermoplastic polyurethane blend nanofibers

2018 ◽  
Vol 1 ◽  
pp. 251522111876932 ◽  
Author(s):  
Sadaf Samimi Gharaie ◽  
Sima Habibi ◽  
Hosein Nazockdast
Keyword(s):  
Thermoplastic Polyurethane ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Polymer Blending ◽  
Total Reflectance ◽  
Mean Diameter ◽  
Fabrication And Characterization ◽  
Reflectance Ftir ◽  
Scanning Electron

Polymer blending is a method to provide nanocomposite nanofibers with improved strength and minimal defects. Chitosan exhibits biocompatibility, biodegradability, antimicrobial activity, and wound healing properties. A combination of gelatin and thermoplastic polyurethane (TPU) blends was explored as a means to improve the morphological deficiencies of chitosan nanofibers and facilitate its electrospinnability. The morphology of the electrospun chitosan, chitosan/gelatin, and chitosan/gelatin/TPU blend nanofibers were characterized using scanning electron microscopy (SEM), while the miscibility and thermal behavior of the blends were determined using differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy/attenuated total reflectance (FTIR/ATR). The optimum results were achieved in blend with 3 wt% chitosan, 8 wt% gelatin, and 5 wt% TPU, which resulted nanofibers with a mean diameter of 100.6 nm ± 17.831 nm.

Discrimination of clinically relevant Candida species by Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR)

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 92065-92072 ◽  
Author(s):  
Sónia Silva ◽  
Flávia Tobaldini-Valerio ◽  
Sofia Costa-de-Oliveira ◽  
Mariana Henriques ◽  
Joana Azeredo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Species Identification ◽  
Candida Species ◽  
Fourier Transform Infrared ◽  
Attenuated Total Reflectance ◽  
Total Reflectance ◽  
Reflectance Ftir

Accurate Candida species identification remains a challenge due to their phenotypic and genotypic similarity.

scholarly journals LDPE Oxidation by CO2 Laser Radiation (10.6 µm)

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
A. Martínez-Romo ◽  
R. González-Mota ◽  
J. J. Soto-Bernal ◽  
I. Rosales-Candelas
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Laser Radiation ◽  
Spectroscopic Properties ◽  
Attenuated Total Reflectance ◽  
Ir Absorption ◽  
Simultaneous Formation ◽  
Total Reflectance ◽  
Reflectance Ftir ◽  
Co2 Laser Radiation

Thermooxidation of LDPE films by CO2 laser radiation, 10.6 μm, was characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR). The formation of carbonyl and hydroxyl functional groups onto LDPE films was dependent on the fluency of CO2 laser. IR absorption of vinyl groups and C-O bond present in alcohols showed a decrease and an increase, respectively, indicating that CO2 laser radiation causes simultaneous formation and accumulation of hydroperoxides in LDPE films; furthermore, crystallinity of LDPE films irradiated with CO2 tends to increase. So, CO2 laser radiation is able to oxidize the LDPE films, obtaining a PE with similar spectroscopic properties to that of PE-BIO by a physical process.

Tea Tree Oil/Ethyl Cellulose Microcapsule Loaded Antimicrobial Textiles

2020 ◽  
Vol 7 (2) ◽  
pp. 1-6
Author(s):  
Burcu Sancar Beşen
Keyword(s):  
Ethyl Cellulose ◽  
Antibacterial Activities ◽  
Antimicrobial Activities ◽  
Cotton Fabrics ◽  
Attenuated Total Reflectance ◽  
Tea Tree Oil ◽  
Total Reflectance ◽  
Tea Tree ◽  
Reflectance Ftir ◽  
Sem Analyses

The aim of this experimental study was to obtain disposable antimicrobial cotton fabrics through applications of tea tree oil/ethyl cellulose (TTO/EC) microcapsules. For this purpose, the TTO/EC microcapsules were prepared and characterized via scanning electron microscopy (SEM) and Fourier transform infrared-attenuated total reflectance (FTIR-ATR) analyses. The characterized microcapsules were then applied to 100% cotton fabric samples via the padding method and were investigated by FTIR-ATR and SEM analyses. In addition, the antibacterial activities of TTO, TTO/EC microcapsules, and fabric samples were also assessed against Escherichia coli and Staphylococcus aureus bacteria. The results showed that the microcapsules were successfully prepared and applied to the fabric samples. In addition, the targeted antimicrobial activities on the textile surfaces were achieved within acceptable levels.

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