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Porównanie w warunkach laboratoryjnych skuteczności inhibitorów ureazy NBPT oraz 2-NPT w ograniczaniu strat gazowych amoniaku z nawozów zawierających azot amidowy

Dawidowicz Michał, Igras Janusz, Rusek Piotr

Przemysł Chemiczny

2020

T. 99, nr 10

1518--1521

Przedstawiono wyniki badań nad skutecznością inhibitorów ureazy NBPT i 2-NPT w ograniczaniu strat azotu z nawozów zawierających azot amidowy. Badaniom poddano nawozy Pulrea®(mocznik), RSM, RSMS oraz Pulaska®. Potwierdzono dużą skuteczność NBPT i 2-NPT w inhibitowaniu enzymatycznej reakcji rozkładu mocznika.

Two urease inhibitors were added (0.1–0.25%) to 4 amide fertilizers to reduce NH₃ emissions. The reduction of NH₃ loss was not less than 77% when compared to the fertilizers without additives. The o-NO₂C₆H₄NHP(O)(NH₂)₂ inhibitor was more efficient than the com. BuNHP(S)(NH₂)₂ one.

Urease Inhibitiory Flavone Glucosides from Marrubium anisodon

Hussain A., Perveen S., Malik A., Afza N., Iqbal L., Tareen R. B.

Polish Journal of Chemistry

2009

Vol. 83, nr 7

1329-1335

Compounds 1–3, new flavonoid glucosides have been isolated from the ethyl acetate soluble fractions of Marrubium anisodon, along with apigenin 4'-O-beta-D-glucopyranoside 4, kaempferol 3-O-beta-D-glucopyranoside 5 and beta-sitosterol 3-O-beta-D-glucopyranoside 6, re - spectively. Their structures were as signed from 1H- and 13C-NMR spectra, DEPT and by COSY, HMQC, NOESY and HMBC experiments. Compounds 1–5 showed significant inhibitory activity against the enzyme urease.

Urease Inhibiting Guaianolides from Amberboa ramosa

Khan S., Riaz N., Afza N., Malik A., Azhar-ul-Haq, Ahmed Z., Lodhi M., Choudhary M.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

2075-2080

New sesquiterpene lactones have been isolated from the chloroform-soluble fraction of Amberboa ramosa and assigned two structures 4 beta-(chloromethyl)-3 beta, 4 alfa-dihydroxy, 8alfa-[(s)-2-carboxypropionoxy]-1alfaH,5alfaH,6betaH,7alfaH-guaia-10(14),11(13)-dien- 6,12-olide (1) and 4 beta(chloromethyl)-3beta ,4alfa-dihydroxy,8alfa-[(s)-3-hydroxy-2-methylpropionyloxy]- 1alfaH,5alfaH,6beta H,7alfaH-guaia-10(14),11(13)-dien-6,12-olide (2), respectively. In addition 5-hydroxy-6-methyl-7-methoxyflavone (3), 6,2',5'-trihydroxy-3,5,7-trimethoxyflavone (4) and 5-hydroxy-3,7,8,2'-tetramethoxyflavone (5) have also been reported for the first time from this species. Compounds 1 and 2 displayed promising inhibitory potential against enzyme urease in a concentration-dependent fashion.