prikaz prve stranice dokumenta Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine
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Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine
Croatica Chemica Acta, 37 (1965), 3; 143-154. urn:nbn:hr:163:435121
Gašparec, Z.; Weber, K.

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Gašparec, Z. i Weber, K. (1965). Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine. Croatica Chemica Acta, 37. (3), 143-154. Preuzeto s https://urn.nsk.hr/urn:nbn:hr:163:435121

Gašparec, Z. i K. Weber. "Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine." Croatica Chemica Acta, vol. 37, br. 3, 1965, str. 143-154. https://urn.nsk.hr/urn:nbn:hr:163:435121

Gašparec, Z. i K. Weber. "Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine." Croatica Chemica Acta 37, br. 3 (1965): 143-154. https://urn.nsk.hr/urn:nbn:hr:163:435121

Gašparec, Z. i Weber, K. (1965) 'Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine', Croatica Chemica Acta, 37(3), str. 143-154. Preuzeto s: https://urn.nsk.hr/urn:nbn:hr:163:435121 (Datum pristupa: 26.04.2024.)

Gašparec Z, Weber K. Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine. Croatica Chemica Acta [Internet]. 1965. [pristupljeno 26.04.2024.];37(3):143-154. Dostupno na: https://urn.nsk.hr/urn:nbn:hr:163:435121

Z. Gašparec i K. Weber, "Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine", Croatica Chemica Acta, vol. 37, br. 3, str. 143-154, 1965. [Online]. Dostupno na: https://urn.nsk.hr/urn:nbn:hr:163:435121. [Citirano: 26.04.2024.]

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Naslov (engleski)Studies on the spectra of protoberberine alkaloids. I. Absorption spectrum of Berberine
AutorZ. Gašparec
AutorK. Weber
Autorova ustanovaSveučilište u Zagrebu
Farmaceutsko-biokemijski fakultet
Znanstveno / umjetničko
područje, polje i grana		PRIRODNE ZNANOSTI
Kemija
Sažetak (engleski)
Measurements have been made of the visible and UV absorption spectra of berberine chloride in pure aqueous, methanol, ethanol and propanol solutions and in the presence of various concentrations of either hydrochloric acid or potassium hydroxide. In all solutions, potassium hydroxide considerably influences both the form of the absorption curves and the values of the extinction coefficients. Bathochromic shifts (red s hift s) of the ab sorption maxima were observed in the ultra-violet spectrum and the disappearence of the absorption maxima in the visible. It has been suggested that the addition of potassium hydroxide causes the formation of the carbinolic form of berberine in all but the aqueous solutions. The open carbinol form is probably formed in the presence of l arge concentrations of KOH. It was found that the shapes of the absorption curves of berberine in the presence of KOH differ widely in different solvents .
Jezikengleski
Vrsta publikacijeZnanstveni rad - Izvorni znanstveni rad
Status objaveObjavljen
Vrsta recenzijeRecenziran - međunarodna recenzija
Verzija publikacijeObjavljena verzija rada (izdavačev PDF)
Naslov časopisaCroatica Chemica Acta
Brojčani podacivol. 37, br. 3, str. 143-154
p-ISSN0011-1643
e-ISSN1334-417X
URN:NBNurn:nbn:hr:163:435121
Datum objave publikacije1965
URL dokumentahttps://hrcak.srce.hr/208204
Vrsta resursaTekst
Prava pristupaOtvoreni pristup
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Datum i vrijeme pohrane2020-05-11 14:04:26