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Article

Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources

1
School of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, Japan
2
Graduate School of Bionics, Tokyo University of Technology, Tokyo 192-0982, Japan
3
School of Engineering, Tokyo University of Technology, Tokyo 192-0982, Japan
4
Tokyo University of Technology, Tokyo 192-0982, Japan
5
Graduate School of Engineering, Tokyo University of Technology, Tokyo 192-0982, Japan
*
Author to whom correspondence should be addressed.
Co-first author.
Appl. Sci. 2021, 11(2), 847; https://doi.org/10.3390/app11020847
Received: 25 December 2020 / Revised: 13 January 2021 / Accepted: 14 January 2021 / Published: 18 January 2021
(This article belongs to the Special Issue Recent Advances in Microalgae Biorefinery Processes)
Recently, cell-plastics, which are composed of unicellular green algal cells and biodegradable compounds as ingredients and fillers, have been suggested as carbon-recyclable materials instead of petroleum-based plastics. In this study, cell-plastics, fabricated with Chlamydomonas reinhardtii as an ingredient and a mixture of two types of starches (raw and oxidized starches) as a filler, were successfully stabilized as independent structures despite the quantity of algal cells being nine times more than that of starch. All starch cell-plastics were water repellent, possibly due to their bumpy surface structures. The starch cell-plastic, composed of 50% cells and 50% starch (1.5:1 of oxidized starch versus raw starch), showed 327 ± 52 MPa as Young’s modulus and 6.45 ± 1.20 MPa as tensile strength, indicating the possibility to be a suitable replacement for petroleum-based plastics. Additionally, all starch cell-plastics showed water-repellency and maintained those structures dipped in phosphate-buffered saline buffer as a water environment for 24 h, meaning that all starch cell-plastics had evaluable water resistance. On the other hand, by adding α-amylase, all starch cell-plastics were collapsed and lost the weight efficiently, indicated their biodegradability. This is the first paper to describe starch cell-plastics from their fabrication to biodegradation. View Full-Text
Keywords: cell-plastics; biodegradability; unicellular green alga; green plastics cell-plastics; biodegradability; unicellular green alga; green plastics
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MDPI and ACS Style

Nakanishi, A.; Iritani, K.; Sakihama, Y.; Watanabe, M.; Mochiduki, A.; Tsuruta, A.; Sakamoto, S.; Ota, A. Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources. Appl. Sci. 2021, 11, 847. https://doi.org/10.3390/app11020847

AMA Style

Nakanishi A, Iritani K, Sakihama Y, Watanabe M, Mochiduki A, Tsuruta A, Sakamoto S, Ota A. Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources. Applied Sciences. 2021; 11(2):847. https://doi.org/10.3390/app11020847

Chicago/Turabian Style

Nakanishi, Akihito, Kohei Iritani, Yuri Sakihama, Marina Watanabe, Ayano Mochiduki, Akane Tsuruta, Syunta Sakamoto, and Ayami Ota. 2021. "Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources" Applied Sciences 11, no. 2: 847. https://doi.org/10.3390/app11020847

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