Electronic states of Myricetin. UV–Vis polarization spectroscopy and quantum chemical calculations

Vojta, Danijela; Karlsen, Eva; Spanget‐Larsen, Jens

doi:10.1016/j.saa.2016.09.012

Cited by 6 publications

(1 citation statement)

References 30 publications

(40 reference statements)

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“…Transisi elektron yang terjadi akibat radiasi UV-Vis pada karbohidrat adalah π-π* dan n-π* dimana transisi ini memerlukan energi yang kecil dan panjang gelombang yang besar. Semakin banyak ikatan rangkap yang terkonjugasi maka semakin kecil celah energinya (Vojta, 2017). Transisi ini sesuai dengan spektrum yang diperlihatkan pada Gambar 10.…”

Section: Analisis Sifat Optik Film Biomulsaunclassified

Produksi Film Biomulsa Dari Klobot Jagung - Lldpe Untuk Aplikasi Di Bidang Hortikultura

Kurniati¹,

Maddu²,

Pramudito³

2019

j.tek.ind.pert

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From a crop production perspective, plastic mulches can increase yields, extend the growing season, reduce weed pressure, increase fertilizer use efficiency, conserve soil moisture, and increase soil temperature. A major limitation of polyethylene mulch involves disposal of mulch material following use. Recently, biodegradable mulch films have been viewed as a more sustainable ecological alternative to plastic polyethylene mulch. In an effort to cope up with the severe and continuously growing agricultural plastic waste problem, biodegradable film was fabricate using natural waste (corn husk) as reinforcing agent and the film fabricated was used to produce biodegradable mulching fim (Biomulch). In this research, the biomulch of the corn husk and Linear Low Density Polyethylene (LLDPE) produced by extrusion and calandering method with a width of 25 cm has been made. Biomulches were made of corn husksby concentration of: 5, 10 and 15% (% w/w). Proximate and fiber analysis were conducted to determine the composition of corn husks. The biomulches were produced were analyzed by mechanical, thermal, microstructure, morphological, and functional group properties.The results showed that the mechanical characteristics decreased with the addition of cornhusk concentration on biomulches, and concentration 5 % had the highest mechanical characteristics with tensile strength of 14.52 MPa, elongation at break of 358.10% and modulus of elasticity of 0.37 GPa.

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Section: Analisis Sifat Optik Film Biomulsaunclassified

Produksi Film Biomulsa Dari Klobot Jagung - Lldpe Untuk Aplikasi Di Bidang Hortikultura

Kurniati¹,

Maddu²,

Pramudito³

2019

j.tek.ind.pert

View full text Add to dashboard Cite

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Intramolecular hydrogen bonding in myricetin and myricitrin. Quantum chemical calculations and vibrational spectroscopy

Vojta

Dominković

Miljanić

et al. 2017

Journal of Molecular Structure

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Quercetin and its analogues: optical and acido–basic properties

Biler

Biedermann

Valentová

et al. 2017

Phys. Chem. Chem. Phys.

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This study is focused on eight structurally analogous natural flavonoids that exhibit a wide range of biological activities, which are of interest in pharmacy, cosmetics and the food industry. Using both experimental and theoretical approaches, we relate their fundamental physico-chemical properties to the structural motifs, with particular focus on UV/Vis absorption properties and pH dependence. We highlight the role of the C2-C3 double bond, whose presence or absence is responsible for the switch between absorption bands in the UVB and UVA regions, which is rationalized by strong modification of the involved molecular orbitals. After deprotonation in an alkaline environment, a typical switch in intensity at the maximum absorption wavelength (λ) is observed enabling the calculation of pK values for compounds with a C2-C3 single bond, whereas a bathochromic shift of λvs. pH is observed for the C2-C3 double bond containing compounds. These behaviors are also rationalized and understood by MO analysis. Interestingly, high pH (above 11 for ampelopsin and above 9 for myricetin) induces the formation of a long-wavelength peak arising from double and/or triple deprotonation. Substitution at position C3 by the OH group has almost no effect on λ for taxifolin and eriodictyol, whereas the effect is larger for quercetin and luteolin. An additional sugar moiety at C3 has a stabilizing effect and induces only minor changes in spectral behavior.

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Electronic states of Myricetin. UV–Vis polarization spectroscopy and quantum chemical calculations

Cited by 6 publications

References 30 publications

Produksi Film Biomulsa Dari Klobot Jagung - Lldpe Untuk Aplikasi Di Bidang Hortikultura

Produksi Film Biomulsa Dari Klobot Jagung - Lldpe Untuk Aplikasi Di Bidang Hortikultura

Intramolecular hydrogen bonding in myricetin and myricitrin. Quantum chemical calculations and vibrational spectroscopy

Quercetin and its analogues: optical and acido–basic properties

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