title: Crude bacterial extracts of two new Streptomyces sp. isolates as bio-colorants for textile dyeing.
abstract: Renewed demand for incorporation of natural dyes (bio-colorants) in textile industry could be met through biotechnological production of bacterial pigments. Two new Streptomyces strains (NP2 and NP4) were isolated for the remarkable ability to produce diffusible deep blue and deep red pigment into fermentation medium. Crude mycelial extracts of both strains were used as bio-colorants in conventional textile dyeing procedures avoiding downstream purification procedures. The yields of bio-colorants obtained in this way were 62 and 84 mg per g of mycelia for Streptomyces sp. NP2 and Streptomyces sp. NP4, respectively. Through nuclear magnetic resonance analysis of crude extracts before and after dyeing procedures, it was shown that both extracts contained prodigiosin-like family of compounds that exhibited different dyeing capabilities towards different textile fibers. Polyamide and acrylic fibers were colored to the deepest shade, polyester and triacetate fibers to a noticeable, but much lower shade depth, while cotton and cellulosic fibers stained weakly. These results confirmed that crude bacterial extracts had the characteristics similar to those of ionic and disperse dyes, which was consistent with the identified polypyrrolic prodigiosin-like structures.
authors.affiliation: Textile Engineering Department, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia.
authors.forename: Ana
authors.initials: A
authors.lastname: Kramar
authors.forename: Tatjana
authors.initials: T
authors.lastname: Ilic-Tomic
authors.forename: Milos
authors.initials: M
authors.lastname: Petkovic
authors.forename: Niko
authors.initials: N
authors.lastname: Radulović
authors.forename: Mirjana
authors.initials: M
authors.lastname: Kostic
authors.forename: Dragan
authors.initials: D
authors.lastname: Jocic
authors.forename: Jasmina
authors.initials: J
authors.lastname: Nikodinovic-Runic
mesh_terms: D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism; D008279:Magnetic Resonance Imaging; D010802:Phylogeny; D010860:Pigments, Biological / Q000096:biosynthesis* / Q000737:chemistry; D011353:Prodigiosin / Q000096:biosynthesis / Q000737:chemistry; D013302:Streptomyces / Q000737:chemistry* / Q000145:classification / Q000302:isolation & purification*; D013783:Textile Industry
chemical_list: D004396:Coloring Agents; D010860:Pigments, Biological; D011353:Prodigiosin