Biosurfactants from urban green waste.
From waste came forth surfactants: Humic acid like substances isolated from 0-60 day-old compost display excellent surface activity and solvent properties. These biosurfactants were used to solubilize a dye in water below and above their critical micellar concentration. The biosurfactant unimers appear to have higher dye-solubilizing power than the corresponding micelles.Humic acid like substances isolated from compost show potential as chemical auxiliaries. In the present study, three surfactant samples were obtained from green waste composted for 0-60 days to assess aging effects of the source on the properties of the products. The surface activity, dye solubility enhancement, and chemical nature of these substances were compared. No differences in performance were established among the samples. They lower water surface tension and enhance the dye solubility upon increasing their concentration. However, the ratio of soluble dye to added surfactant is higher in the premicellar than in the postmicellar concentration region. Structural investigations indicated the humic acid like substances to be amphiphiles with molecular weights in the range of 1-3 x 10(5) g mol(-1). The surfactant samples were also compared to sodium dodecylbenzenesulfonate, polyacrylic acid, and soil and water humic substances. The results encourage the application of compost as a source of low-cost biosurfactant.
Montoneri
Enzo
E
Dipartimento di Chimica Generale e Chimica Organica, Università di Torino, Corso Massimo d'Azeglio 48, Turin, Italy. enzo.montoneri@unito.it
Boffa
Vittorio
V
Savarino
Piero
P
Perrone
Daniele G
DG
Musso
Giorgia
G
Mendichi
Raniero
R
Chierotti
Michele R
MR
Gobetto
Roberto
R
D000180:Acrylic Resins / Q000737:chemistry; D001557:Benzenesulfonates / Q000737:chemistry; D002947:Cities; D004396:Coloring Agents / Q000737:chemistry; D003247:Conservation of Natural Resources; D006812:Humic Substances; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008970:Molecular Weight; D012542:Scattering, Radiation; D012987:Soil; D012995:Solubility; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D000099166:Polyacrylamides
D000180:Acrylic Resins; D001557:Benzenesulfonates; D004396:Coloring Agents; D006812:Humic Substances; D012987:Soil; D013501:Surface-Active Agents; D000099166:Polyacrylamides; C006903:carbopol 940; C001114:dodecylbenzenesulfonic acid