Physical and chemical study of coated Candida cylindracea with sorbitan esters

A new effective biocatalyst was prepared by coating lipase from Candida cylindracea with sorbitan esters such as span 60 and 65. This biocatalyst was characterized by employing the Scanning Electron Microscopy, X-Ray diffraction patterns and a lipase assay. The type of surfactant used during the lipase modification process has shown significant effect in the lipase activity and the protein content of the modified lipase complex. It was found that catalytic behavior of modified lipase was greatly affected by the source of the used span. Span 65-coated Candida cylindracea lipase showed the highest conversion of 50% in enzymatic esterification of glucose and lauric acid.

Exploring the Impact of Lipid-Rich Food Industry Waste Carbon Sources on the Growth of Candida cylindracea DSM 2031

The aim of this study was to evaluate the possibility of using several lipid-rich food industry wastes in the culture medium on the growth of Candida cylindracea DSM 2031 yeast strain. Four lipid wastes from the food industry: waste fish oil, rancid ghee, waste pork lard, and waste duck processing oil were investigated. It has been shown in the laboratory scale that the above-mentioned wastes can be used to obtain biomass and produce lipolytic enzymes by the tested strain and the C. cylindracea extracellular lipase is not constitutive. High yields of biomass (12.84, 12.75, and 12.24 g/dm3) were obtained in media containing waste duck processing oil, olive oil, and waste pork lard, respectively. The highest lipolytic activity was obtained in the media containing waste fish oil and rancid ghee (0.050 and 0.047 U/cm3). During 192-h flask cultures the highest extracellular lipase activity and biomass yield were observed in the late logarithmic phase. The study showed that there is a potential for waste management to produce lipolytic enzymes or to produce yeast biomass. The use of waste substrates may contribute to lowering the costs of commercial production, and such a solution is part of the sustainable development strategy.

Хиральные аналоги α-токоферола. Антиоксидантная активность (R)- и (S)-энантиомеров {2-[6-гидрокси-2,5,7,8-тетраметилхроман-2-ил]этил}триметиламмоний-п-толуолсульфоната в зависимости от их конфигурации

Исходя из (R)- и (S)-энантиомеров 2-(6-бензилокси-2,5,7,8-тетраметилхроман-2-ил)этанола, полученных ранее на основе парциального ацилирования соответствующего рацемического спирта в присутствии наиболее доступной липазы дрожжей Candida cylindracea синтезированы в 4 стадии оба энантиомера {2-[6-гидрокси-2,5,7,8-тетраметилхроман-2-ил]этил} триметиламмоний-п-толуолсульфоната (MDL-73404), хиральных аналогов α-токоферола. Сравнительное медико-биологическое тестирование разных по энантиомерному составу образцов соли MDL-73404 в отношении их влияния на генерирование активных форм кислорода перитонеальными макрофагами белых крыс в системах с люминолом или люцигенином показало неодинаковое ингибирование спонтанной и активированной 12-O-миристил-13-O-ацетилфорболом хемилюминесценции макрофагов.