Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources
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 <i>Chlamydomonas reinhardti...
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doaj-5418c02c10cc40d6a7d2e94c7c071b9e2021-01-19T00:02:10ZengMDPI AGApplied Sciences2076-34172021-01-011184784710.3390/app11020847Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable ResourcesAkihito Nakanishi0Kohei Iritani1Yuri Sakihama2Marina Watanabe3Ayano Mochiduki4Akane Tsuruta5Syunta Sakamoto6Ayami Ota7School of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, JapanSchool of Engineering, Tokyo University of Technology, Tokyo 192-0982, JapanTokyo University of Technology, Tokyo 192-0982, JapanSchool of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, JapanSchool of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, JapanSchool of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, JapanGraduate School of Engineering, Tokyo University of Technology, Tokyo 192-0982, JapanSchool of Engineering, Tokyo University of Technology, Tokyo 192-0982, JapanRecently, 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 <i>Chlamydomonas reinhardtii</i> 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.https://www.mdpi.com/2076-3417/11/2/847cell-plasticsbiodegradabilityunicellular green algagreen plastics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Akihito Nakanishi Kohei Iritani Yuri Sakihama Marina Watanabe Ayano Mochiduki Akane Tsuruta Syunta Sakamoto Ayami Ota |
spellingShingle |
Akihito Nakanishi Kohei Iritani Yuri Sakihama Marina Watanabe Ayano Mochiduki Akane Tsuruta Syunta Sakamoto Ayami Ota Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources Applied Sciences cell-plastics biodegradability unicellular green alga green plastics |
author_facet |
Akihito Nakanishi Kohei Iritani Yuri Sakihama Marina Watanabe Ayano Mochiduki Akane Tsuruta Syunta Sakamoto Ayami Ota |
author_sort |
Akihito Nakanishi |
title |
Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources |
title_short |
Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources |
title_full |
Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources |
title_fullStr |
Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources |
title_full_unstemmed |
Fabrication and Biodegradability of Starch Cell-Plastics as Recyclable Resources |
title_sort |
fabrication and biodegradability of starch cell-plastics as recyclable resources |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2021-01-01 |
description |
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 <i>Chlamydomonas reinhardtii</i> 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. |
topic |
cell-plastics biodegradability unicellular green alga green plastics |
url |
https://www.mdpi.com/2076-3417/11/2/847 |
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