ABSTRACT
«Crude¼ extracts obtained via simple ultrasonic disintegration of microbial cell membrane are perspective bioelectrocatalysts. This extract contains all the necessary enzymes and cofactors required for oxidative or reductive conversion. The technology of synthesis of «crude extract¼ is simpler and less costly in comparison with technology of obtaining pure enzymes. Dialysis of the obtained extracts was performed with different molecular weight cut-off (3.5 kDa, 12-14 kDa, 25 kDa, 50 kDa). The obtained data show that after dialysis extracts lose their dehydrogenase and bioelectrocatalytic activity due to the loss of cofactors. However, the addition of NAD and NADP cofactors leads to a recovery of activity. The obtained data demonstrate that the concentration of the cofactor directly affects the rate of the bioelectrocatalytic reaction. Also, the obtained data indicate that the composition of the enzyme systems of the extract includes succinate dehydrogenase. Analyzing this data set can provide insight on increase of the electrocatalytic activity of a new type of bioelectrocatalyst.
ABSTRACT
We studied specific antitumor activity of a liposomal drug based on tetra-3-phenylthiophthalocyanine aluminum hydroxide (lipophthalocyan) intended for photodynamic therapy. The optimal dose and protocol for photodynamic therapy with lipophthalocyan were chosen in experiments on mice: single intravenous dose of 6 mg/kg with a 5-h interval between administration and laser exposure and irradiation energy density of 400 J/cm2. A wide spectrum antitumor activity of lipophthalocyan was demonstrated in vivo for various transplantable mouse tumors (Lewis lung epidermoid carcinoma, S37 sarcoma, and colon adenocarcinoma AKATOL). The results show the possibility of using lipophthalocyan for photodynamic therapy of tumors of surface localization (skin and mucosa tumors).
