Applied Microbiology and Biotechnology

, Volume 100, Issue 20, pp 8931–8942 | Cite as

Biological devulcanization of ground natural rubber by Gordonia desulfuricans DSM 44462T strain

  • Valeria Tatangelo
  • Ivan Mangili
  • Paola Caracino
  • Manuela Anzano
  • Ziba Najmi
  • Giuseppina Bestetti
  • Elena Collina
  • Andrea Franzetti
  • Marina Lasagni
Environmental biotechnology

Abstract

Due to the rapid increase of waste vulcanized rubber products, the development of low-cost, efficient, and selective devulcanization processes is needed. In this paper, the devulcanization ability of Gordonia desulfuricans DSM 44462T was evaluated by a design of experiments. The aim of the experimental design was to investigate the importance of parameters influencing the bacterial growth, such as the glucose concentration (C), dibenzothiophene concentration (DBT), and initial biomass (optical density, OD) in biodevulcanization process. The complex viscosity (η*) was chosen as experimental response for the experimental design. A multiple linear regression was used to model the relationship between the response and the process variables. In addition, the crosslink density and gel fraction were measured. Furthermore, the automated ribosomal intergenic spacer analysis (ARISA) as a microbiological method was performed to assess the persistence of the inoculated strain during the experiments. Reduced regression models were obtained considering only the significant variables and interactions. The glucose concentration C and OD variables and C–DBT and DBT–OD interactions resulted to the relevant parameters for the process. The fingerprinting showed the persistence of G. desulfuricans DSM 44462T, despite the presence of other bacterial population after the VGNR sterilization. These results highlight the importance to support the physics analysis with microbiological analyses to evaluate the bacterial persistence during the treatment.

Keywords

Recycling Vulcanized ground natural rubber Biological devulcanization Gordonia desulfuricans DSM 44462T ARISA 

Notes

Compliance with ethical standards

Ethical statements

This work was partially funded by Fondazione Silvio Tronchetti-Provera which also supported PhD fellowship to VT. The author Paola Caracino is an employer of Pirelli Spa, which is a tire producing manufacturer. This article does not contain any studies with human participants or animals performed by any of the authors

Supplementary material

253_2016_7691_MOESM1_ESM.pdf (480 kb)
ESM 1(PDF 479 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Earth and Environmental SciencesUniversity of Milano-BicoccaMilanoItaly
  2. 2.Pirelli Labs S.p.A.MilanoItaly
  3. 3.Department of Microbiology, Faculty of Biology SciencesUniversity of Shahid BeheshtiTehranIran

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