Bio-based polyester-polyurethane foams: synthesis and degradability by Aspergillus niger and Aspergillus clavatus

IF 3.1 4区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Biodegradation Pub Date : 2023-11-21 DOI:10.1007/s10532-023-10059-w

Mara L. Polo, Karen Russell-White, Santiago E. Vaillard, Luis Ríos, Gregorio R. Meira, Diana A. Estenoz, Marisa E. Spontón

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Abstract

In this article, the degradability by Aspergillus niger and Aspergillus clavatus of three bio-based polyurethane (PU) foams is compared to previous degradability studies involving a Pseudomonas sp. bacterium and similar initial materials (Spontón et al. in Int. Biodet. Biodeg. 85:85–94, 2013, https://doi.org/10.1016/j.ibiod.2013.05.019). First, three new polyester-polyurethane foams were prepared from mixtures of castor oil (CO), maleated castor oil (MACO), toluene diisocyanate (TDI), and water. Then, their degradation tests were carried out in an aqueous medium, and employing the two mentioned fungi, after their isolation from the environment. From the degradation tests, the following was observed: (a) the insoluble (and slightly collapsed) foams exhibited free hydroxyl, carboxyl, and amine moieties; and (b) the water soluble (and low molar mass) compounds contained amines, carboxylic acids, and glycerol. The most degraded foam contained the highest amount of MACO, and therefore the highest concentration of hydrolytic bonds. A basic biodegradation mechanism was proposed that involves hydrolysis and oxidation reactions.

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生物基聚酯-聚氨酯泡沫:黑曲霉和克拉曲霉的合成及其降解性。

本文将黑曲霉和克拉曲霉对三种生物基聚氨酯(PU)泡沫的可降解性与先前涉及假单胞菌属细菌和类似初始材料的可降解性研究(Spontón等)进行了比较。Biodet。生物工程学报。85:85-94,2013,https://doi.org/10.1016/j.ibiod.2013.05.019)。首先，用蓖麻油(CO)、马来酸蓖麻油(MACO)、甲苯二异氰酸酯(TDI)和水的混合物制备了三种新型聚酯-聚氨酯泡沫。然后，在从环境中分离出这两种真菌后，在水介质中进行降解试验。从降解试验中，观察到以下情况:(a)不溶性(和轻微塌陷)泡沫表现出游离的羟基、羧基和胺基团;(b)水溶性(低摩尔质量)化合物含有胺、羧酸和甘油。降解程度最高的泡沫含有最多的MACO，因此水解键的浓度也最高。提出了一种基本的生物降解机制，包括水解和氧化反应。

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来源期刊

Biodegradation 工程技术-生物工程与应用微生物

CiteScore

5.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Biodegradation publishes papers, reviews and mini-reviews on the biotransformation, mineralization, detoxification, recycling, amelioration or treatment of chemicals or waste materials by naturally-occurring microbial strains, microbial associations, or recombinant organisms. Coverage spans a range of topics, including Biochemistry of biodegradative pathways; Genetics of biodegradative organisms and development of recombinant biodegrading organisms; Molecular biology-based studies of biodegradative microbial communities; Enhancement of naturally-occurring biodegradative properties and activities. Also featured are novel applications of biodegradation and biotransformation technology, to soil, water, sewage, heavy metals and radionuclides, organohalogens, high-COD wastes, straight-, branched-chain and aromatic hydrocarbons; Coverage extends to design and scale-up of laboratory processes and bioreactor systems. Also offered are papers on economic and legal aspects of biological treatment of waste.