Abstract Sesbania virgata (Cav.) Pers. seeds are protein sources with health and environmental benefits. In this research, proteins with lectin activity were identified in a protein fraction from S. virgata seeds (PFLA), as well its antioxidant and antimicrobial potentials, in addition to cytotoxic effects. To obtain PFLA, seed flour was homogenized in Glycine-NaOH (100 mM; pH 9.0; NaCl 150 mM) and precipitated in ammonium sulfate. PFLA concentrates bioactive lectins (32 HU/mL, 480 HU/gFa, 18.862 HU/mgP) and essential amino acids (13.36 g/100g protein). PFLA exerts antioxidant activity, acting as a promising metal chelating agent (~77% of activity). Analyzes of cell culture assay results suggest that antioxidant activity of PFLA may be associated with the recruitment of essential molecules to prevent the metabolic impairment of cells exposed to oxidative stress. PFLA (256 – 512 µg/mL) also exhibits antifungal activity, inhibiting the growth of Aspergillus flavus, Candida albicans, Candida tropicalis and Penicillium citrinum. Cytotoxic analysis indicates a tendency of low interference in the proliferation of 3T3 and HepG2 cells in the range of PFLA concentrations with biological activity. These findings support the notion that PFLA is a promising adjuvant to be applied in current policies on the management of metal ion chelation and fungal infections. Cav. Cav (Cav. Pers benefits research S , (PFLA) potentials effects GlycineNaOH Glycine NaOH 100 (10 mM 9.0 90 9 0 15 sulfate 32 (3 HUmL HU mL HU/mL 48 HUgFa gFa HU/gFa 18862 18 862 18.86 HU/mgP HUmgP mgP 13.36 1336 13 36 (13.3 g100g gg g 100g protein. . protein) ~77% 77 (~77 activity) stress 256 (25 51 µg/mL µgmL µg flavus albicans citrinum T 3T HepG infections (Cav (PFLA 10 (1 9. 1 3 ( 4 1886 86 18.8 13.3 133 (13. ~77 7 (~7 25 (2 5 188 8 18. 13. (13 ~7 (~ 2 ~

Levedura de cerveja foi submetida a estudos analíticos para determinação de sua composição química e a ensaios biológicos em ratos para determinação de seu valor protéico, na forma de células íntegras e com as paredes celulares rompidas mecanicamente, através de um moinho com esferas de vidro (Dynomill). Na composição da biomassa predominam as proteínas (48,52%), os carboidratos (32,92%), minerais (8,32%), RNA (7,52%) e lípides totais (3,4%). O perfil de aminoácidos da proteína é adequado para nutrição humana, superando as recomendações da FAO/WHO/UNU de aminoácidos essenciais, sendo particularmente rica em lisina, podendo ser indicada para complementar a proteína de cereais. O valor protéico determinado através de ensaios biológicos (PER e NPUa) representou 70-80% dos valores para caseína, utilizada como referência.

Brewer's yeast was submitted to analytical studies to determine its chemical composition and through biological assays with rats to determine its protein value in the form of integral cells and after mechanical rupture of the cell walls in a dynomill with glass spheres. The main components of the biomass was protein (48.5%), carbohydrate (32.9%), minerals (8.3%), RNA (7.5%) and total lipids (3.4%). The protein amino acids profile is adequate for human nutrition, supplying all the essencial amino acids recommended by FAO/WHO/UNU, being particularly rich in lysine and could be indicated for complementation of cereals protein. The protein value established by biological assays (PER, NPUa) represented 70 to 80% of casein, utilized in this study as reference.