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A Protein-Based Material from a New Approach Using Whole Defatted Larvae, and Its Interaction with Moisture
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-7944-4103
SLU Swedish Univ Agr Sci, Dept Energy & Technol, POB 7032, SE-75007 Uppsala, Sweden..
Univ Lyon 1, Univ Lyon, Ingn Mat Polymeres, CNRS,UMR 5223, 15 Bd Andre Latarjet, F-69622 Villeurbanne, France..
Univ Lyon 1, Univ Lyon, Ingn Mat Polymeres, CNRS,UMR 5223, 15 Bd Andre Latarjet, F-69622 Villeurbanne, France..
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2019 (English)In: Polymers, E-ISSN 2073-4360, Vol. 11, no 2, article id 287Article in journal (Refereed) Published
Abstract [en]

A protein-based material created from a new approach using whole defatted larvae of the Black Soldier fly is presented. The larvae turn organic waste into their own biomass with high content of protein and lipids, which can be used as animal feed or for material production. After removing the larva lipid and adding a plasticizer, the ground material was compression molded into plates/films. The lipid, rich in saturated fatty acids, can be used in applications such as lubricants. The amino acids present in the greatest amounts were the essential amino acids aspartic acid/asparagine and glutamic acid/glutamine. Infrared spectroscopy revealed that the protein material had a high amount of strongly hydrogen-bonded beta-sheets, indicative of a highly aggregated protein. To assess the moisture-protein material interactions, the moisture uptake was investigated. The moisture uptake followed a BET type III moisture sorption isotherm, which could be fitted to the Guggenheim, Anderson and de Boer (GAB) equation. GAB, in combination with cluster size analysis, revealed that the water clustered in the material already at a low moisture content and the cluster increased in size with increasing relative humidity. The clustering also led to a peak in moisture diffusivity at an intermediate moisture uptake.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 11, no 2, article id 287
Keywords [en]
protein, larva, plastic, lipid, Black Soldier fly, moisture sorption
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-246270DOI: 10.3390/polym11020287ISI: 000460296000101PubMedID: 30960271Scopus ID: 2-s2.0-85061351298OAI: oai:DiVA.org:kth-246270DiVA, id: diva2:1299253
Note

QC 20190126

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2024-01-17Bibliographically approved
In thesis
1. Interactions between polymers and the environment
Open this publication in new window or tab >>Interactions between polymers and the environment
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation addresses the structure and properties of a number of polymer-based materials when they come into contact with specific environments. The first part describes the migration and depletion of active substances from insecticide-impregnated polyethylene sheets in water and air at different humidity levels and higher temperatures. 

  In the second part, the structure, crystallization kinetics, and mechanical and transport properties of multilayer polymer films, consisting of metallocene (mPE) and low-density (LDPE) polyethylene layers, and in some cases also with layers of poly(ethylene-co-vinyl alcohol) and a polyethylene compatibilizer were investigated. Furthermore, inhomogeneous swelling was observed in the 2-layer films containing mPE and LDPE due to differences in the uptake of n-hexane (and limonene) in the respective film layers. These differences caused a bending/curvature of the film upon exposure to the vapour. This effect was further evaluated to determine whether solvent-induced bending could be used as a passive sensor to detect the presence and content of volatile organic compounds in air (VOC). 

  The third part of this thesis describes the possibility of producing biopolymer materials based on larvae from the black soldier fly. After adding a plasticizer to the degreased larval material, protein-based biopolymer films were prepared via compression-moulding. The lipid extracted from the degreasing operation could potentially be used in various applications, such as those involving lubricants. 

  In the last part of this work the release of micro- and nano-particles were determined from a polypropylene nanoclay-composite in a commonly occurring environment for plastics (air at elevated temperature). A prototype exposure chamber was built, and a method was developed to allow aging (degradation) of the sample in this chamber and analyze the effects of aging on the sample.

Abstract [sv]

Denna avhandling behandlar struktur och egenskaper hos ett antal polymerbaserade material i kontakt med vissa specifika miljöer. Den första delen behandlar migration och utarmning av aktiva substanser från insekticid-impregnerade polyetenplattor i vatten och luft vid olika luftfuktigheter och högre temperatur.

I den andra delen studerades strukturen, kristallisationskinetiken samt mekaniska och transportegenskaper hos flerskiktade polymerfilmer uppbyggda av metallocen-polyeten (mPE) och lågdensitetspolyeten (LDPE), och i vissa fall också med skikt av poly(etylen-co-vinylalkohol) och en polyetenkompatibilisator. Vidare observerades en inhomogen svällning i 2-skiktsfilmen med mPE och LDPE, på grund av skillnader i upptag av n-hexan (och limonen) i respektive filmskikt, vilket orsakade en böjning/krökning av filmen vid exponering för ångan. Denna effekt utvärderades ytterligare för att se om den lösningsmedelsinducerade böjningen kunde användas som en passiv sensor för att detektera närvaron och halten av flyktiga organiska föreningar i luft (VOC). 

I den tredje delen av detta arbete visades möjligheten att producera biopolymer-material baserat på larver (Svart soldatfluga). Efter tillsats av en mjukgörare till det avfettade larvmaterialet framställdes protein-baserade biopolymerfilmer genom kompressionsgjutning. Den extraherade lipiden från avfettningen kan potentiallt också användas i olika applikationer, såsom i smörjmedel. 

I den sista delen av detta arbete undersöktes frisättningen av mikro- och nanopartiklar från en nanokomposit av polypropen och nanolera i en vanlig miljö för plast (luft vid förhöjd temperatur). En prototyp-exponeringskammare konstruerades och en metodik utvecklades för att kunna åldra (bryta ned) provet i denna kammare och analysera effekten av åldrandet.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2021. p. 64
Series
TRITA-CBH-FOU ; 35
Keywords
Deltamethrin, piperonyl butoxide, polyethylene, migration, multilayer film, EVOH, n-hexane, crystallization, mechanical properties, X-ray scattering, swelling, larvae, protein, lipid, moisture sorption, release, nanoclay, polypropylene, degradation
National Category
Polymer Technologies
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-301255 (URN)978-91-7873-970-7 (ISBN)
Public defence
2021-09-30, https://kth-se.zoom.us/webinar/register/WN_QLyLOUD-SA-H4j7Gw00qfA, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 2021-09-07

Available from: 2021-09-07 Created: 2021-09-06 Last updated: 2022-06-25Bibliographically approved

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Alipour, NazaninHedenqvist, Mikael S.

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