Screening of Microorganisms to Decolorize a Model Melanoidin and the Chemical Properties of a Microbially Treated Melanoidin

Isolation of a Fungus to Decolorize Coffee

“…In a previous paper, 1) we reported that a soil microbe of Streptomyces werraensis TT 14 decolorized a model melanoidin. This strain did not decolorize such phenol-type brown pigments as coffee and black tea.…”

Effect of reaction pH on the photodegradation of model melanoidins

“…ammerer & Kroh, 1995;Tressl, Wondrak, Kr . uger, & Rewicki, 1998), based on the volatile components and other products formed by pyrolysis (Gomyo, Kato, Udaka, Horikoshi, & Fujimaki, 1972;Hayase & Kato, 1981;Kato & Tsuchida, 1981;Hayase, Sato, Tsuchida, & Kato, 1982), ozonolysis (Kim, Hayase, & Kato, 1985), degradation by H 2 O 2 (Hayase, Kim, & Kato, 1984), and mild microbiological degradation (Watanabe, Sugi, Tanaka, & Hayashida, 1982;Aoshima, Tozawa, Ohmomo, & Ueda, 1985;Sirianuntapiboon, Somchai, Ohmomo, & Atthasampunna, 1988;Murata, Terasawa, & Homma, 1992).…”

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“…However, the application of fungi to remove melanoidins in molasses wastewater is inconvenient due to their slow growth, spore production and infectivity 34 . To date, bacterial decolourization of molasses wastewater has been reported by many researchers 1,6,21,22 . It was established that bacteria, especially pure culture, displayed a limited capability to decolourize melanoidins because the toxicity of metabolites which were formed and accumulated during decolourization, thereby compromised the efficiency of bacteria 3 .…”

“…20 , and certain bacteria such as Bacillus sp. 21,22 , Pseudomonas fluorescence 1 , and acetogenic bacteria 6 have been reported. There are a good number of reports showing the role of fungi in the decolourization of melanoidins by adsorption to mycelia as well as the role of ligninolytic enzymes 23,24 .…”