Browsing by Author "Bulmaga, Valentina"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    EFECTUL STIMULATOR AL TRIS - β -AMINOETILAŢILOR DE COBALT(III) ASUPRA PRODUCTIVITĂŢII CIANOBACTERIEI SPIRULINA PLATENSIS
    (CEP USM, 2008) Cotovaia, Aliona; Gulea, Aurelian; Şova, Sergiu; Ciumac, Daniela; Bulmaga, Valentina; Ţurcanu, Ştefan; Rudic, Valeriu
    As a result of cobalt (III) β-aminoethylate protonation reactions with sulfuric and nitr ic acids, several new coordination compounds of composition [Co(Hetm)3](NO3)3(1) and [Co(Hetm)3]2(SO4)3⋅4H2O (2) have been synthesized. The reaction between β -aminoethanol and cobalt(III) nitrate, acetate and sulfate in neutral or slightly basic alcoholic media leads to the formation of cobalt (III) coordination compounds, which internal sphere includes both molecules of neutral β-ami-noethanol (Hetm) and ions of its deprotonated form (etm). The general formula of the complexes can be given as [Co(Hetm)3][Co(etm)3]X3nH2O, where X = NO3- (3), CH3COO- (4), 1/2SO42- (5); n = 0, 7, or 3 correspondingly. The biologic activity study of the synthesized complexes revealed that the algae biomass obtained in the nutritive media, containing coordination compounds, depends on the internal coordination sphere of the cobalt compound.
  • Thumbnail Image
    Item
    PROCEDEU DE OBŢINERE A SE - EXOPOLIZAHARIDELOR PRODUSE DE CIANOBACTERI A SPIRULINA PLATENSIS
    (CEP USM, 2017) Bulmaga, Valentina; Zosim, Liliana; Pisova, Maria; Reva, Veaceslav
    Au fost obţinute preparate de Se-EPZ şi EPZ din cianobacteria Spirulina platensis cultivată pe mediu nutritiv cu şi fără adaosdeselenit. Extracteleparţial purificat e (după înlăturarea fracţiei proteice) au fost supuse separării prin metoda HPLC pe coloana de Toyo-Pearl HW40F. Au fost scanate spectrele UV ale preparatelor de exopolizaharide şi elaborată schema tehnologică de realizare a unui procedeu de obţinere a Se-EPZproduse de Spirulina platensis.