RESUMO
The fermentative production of lactic acid from cheese whey and corn steep liquor (CSL) as cheap raw materials was investigated by using Lactobacillus sp. RKY2 in order to develop a cost-effective fermentation medium. Lactic acid yields based on consumed lactose were obtained at more than 0.98 g/g from the medium containing whey lactose. Lactic acid productivities and yields obtained from whey lactose medium were slightly higher than those obtained from pure lactose medium. The lactic acid productivity gradually decreased with increase in substrate concentration owing to substrate and product inhibitions. The fermentation efficiencies were improved by the addition of more CSL to the medium. Moreover, through the cell-recycle repeated batch fermentation, lactic acid productivity was maximized to 6.34 g/L/h, which was 6.2 times higher than that of the batch fermentation.
Assuntos
Reatores Biológicos/microbiologia , Técnicas de Cultura de Células/métodos , Queijo/microbiologia , Resíduos Industriais/prevenção & controle , Ácido Láctico/biossíntese , Lactobacillus/fisiologia , Zea mays/microbiologia , Proliferação de Células , Ácido Láctico/isolamento & purificação , Lactose/metabolismoRESUMO
To examine inflammatory tissue, an initial and common symptom of various types of pathogenesis, we designed inflammation-targeted T(1) contrast agents prepared by bioconjugation of gadolinium diethylenetriaminepentaacetic acid (Gd-DTPA) with anti-intercellular adhesion molecule 1 (ICAM-1) antibody. The anti-ICAM-1 antibody was coupled with DTPA and was then conjugated with Gd. The specific binding of the Gd-DTPA-anti-ICAM-1 antibody complex to the ICAM-1-expressing cells was examined in the cultured endothelial cells where ICAM-1 expression was stimulated. Inflammation-specific T(1) imaging was then assessed using a mouse abscess model with the 1.5-Tesla module. The Gd-DTPA-anti-ICAM-1 antibody displayed increased r1, which was two times higher than that of Gd-DTPA and showed predominant binding to cultured endothelial cells, which expressed a high level of ICAM-1. Moreover, the inflammation-specific T(1) enhancement was imaged with the Gd-DTPA-anti-ICAM-1 antibody in the mouse acute inflammation model. The Gd-DTPA-anti-ICAM-1 antibody showed significantly increased vascular circulation time, which thereby offered a greater chance for its binding to the target cells. The Gd-DTPA-anti-ICAM-1 antibody displays a potential targeted T(1) contrast agent specific to the inflammatory tissue that expresses ICAM-1.
Assuntos
Anticorpos Monoclonais , Gadolínio DTPA , Inflamação/diagnóstico , Molécula 1 de Adesão Intercelular/análise , Imageamento por Ressonância Magnética/métodos , Abscesso/diagnóstico , Animais , Anticorpos Monoclonais/análise , Anticorpos Monoclonais/farmacocinética , Células Cultivadas , Meios de Contraste/química , Modelos Animais de Doenças , Células Endoteliais/química , Gadolínio DTPA/análise , Gadolínio DTPA/química , Gadolínio DTPA/farmacocinética , Meia-Vida , Imuno-Histoquímica , Inflamação/microbiologia , Camundongos , Ratos , Staphylococcus aureusRESUMO
The fermentative production of lactic acid from cheese whey and corn steep liquor (CSL) as cheap raw materials was investigated by using Lactobacillus sp. RKY2 in order to develop a cost-effective fermentation medium. Lactic acid yields based on consumed lactose were obtained at more than 0.98 g/g from the medium containing whey lactose. Lactic acid productivities and yields obtained from whey lactose medium were slightly higher than those obtained from pure lactose medium. The lactic acid productivity gradually decreased with increase in substrate concentration owing to substrate and product inhibitions. The fermentation efficiencies were improved by the addition of more CSL to the medium. Moreover, through the cell-recycle repeated batch fermentation, lactic acid productivity was maximized to 6.34 g/L/h, which was 6.2 times higher than that of the batch fermentation.