?Antiplasticization? in starch-glycerol films?

Lourdin, Denis; Bizot, Hervé; Colonna, Paul

doi:10.1002/(sici)1097-4628(19970222)63:8<1047::aid-app11>3.0.co;2-3

Cited by 315 publications

(106 citation statements)

References 6 publications

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“…This phenomenon also exists in TPS and has been receiving increasing attention recently (Chang et al, 2006). Contrary to the orthodox behaviour of plasticization, plasticizer can reduce elongation and gas permeability, and increase tensile strength and modulus of elasticity of TPS when it is introduced in low amount under a critical level (generally <25%) (Godbillot et al, 2006;Lourdin et al, 1997;Zhang & Han, 2010). Fig.…”

Section: Tps Antiplasticization and Its Explanationmentioning

confidence: 99%

Retrogradation and Antiplasticization of Thermoplastic Starch

Zhang¹,

Rempel²

2012

Thermoplastic Elastomers

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Section: Tps Antiplasticization and Its Explanationmentioning

confidence: 99%

Retrogradation and Antiplasticization of Thermoplastic Starch

Zhang¹,

Rempel²

2012

Thermoplastic Elastomers

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“…This phenomenon was possibly related to the permanence of the grains in the water/ glycerol solution: indeed, glycerol is an efficient plasticizing agent that has a crucial influence on starch-based materials (28) and possibly enhanced the swelling of the grains that were previously subjected to thermal processing. Furthermore, observations carried out on starch grains from other ancient grinding stones indicated that the use of water/glycerol solution alone was not sufficient to cause jelling and swelling: indeed, the phenomenon was not observed in the Bilancino starch grains, which were subjected to the same laboratory procedure (3), after a prolonged permanence in the water/glycerol solution.…”

Section: Discussionmentioning

confidence: 99%

Multistep food plant processing at Grotta Paglicci (Southern Italy) around 32,600 cal B.P.

Lippi

Foggi

Aranguren³

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Residue analyses on a grinding tool recovered at Grotta Paglicci sublayer 23A [32,614 ± 429 calibrated (cal) B.P.], Southern Italy, have demonstrated that early modern humans collected and processed various plants. The recording of starch grains attributable to Avena (oat) caryopses expands our information about the food plants used for producing flour in Europe during the Paleolithic and about the origins of a food tradition persisting up to the present in the Mediterranean basin. The quantitative distribution of the starch grains on the surface of the grinding stone furnished information about the tool handling, confirming its use as a pestlegrinder, as suggested by the wear-trace analysis. The particular state of preservation of the starch grains suggests the use of a thermal treatment before grinding, possibly to accelerate drying of the plants, making the following process easier and faster. The study clearly indicates that the exploitation of plant resources was very important for hunter-gatherer populations, to the point that the Early Gravettian inhabitants of Paglicci were able to process food plants and already possessed a wealth of knowledge that was to become widespread after the dawn of agriculture.starch grains | Avena | pestle-grinder | flour | Early Gravettian

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“…20% glycerol has been shown to be the maximum rate leading to starch plasticization with- [24,25]. Then according to the various formulations (Table 1), active compounds were added in the starch-glycerol blend and the humidity rate was adjusted at 10% w/w.…”

Section: Sample Preparationmentioning

confidence: 99%

Research Article. Role of ascorbic acid and iron in mechanical and oxygen absorption properties of starch and polycaprolactone multilayer film

Mahieu¹,

Terrie²,

Leblanc³

2017

Packaging Research

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A trilayer film based on thermoplastic starch (TPS) for the core layer and poly(ϵ-caprolactone) (PCL) for the skin layers was obtained by coextrusion. Ascorbic acid and iron powder were added at respectively 15% and 1.5% w/w in the TPS layer for their capacity to act as oxygen scavenger, making the film usable as active food packaging. This study demonstrates that these compounds also play a role in the interactions between the different layers. FTIR measurements show that ascorbic acid migrates at the interface between TPS and PCL, where it acts as a compatibiliser between both polymers, probably by creating new interactions between polar functions of both polymers. This leads to a better adhesion of the different layers, demonstrated by the increase of the adhesion energy from 4.10 −3 N·mm −1 for the multilayer film TPS-PCL to 12.10 −3 N·mm −1 for the multilayer film containing the active components. Thanks to this compatibilising effect, the mechanical properties of the multilayer film containing ascorbic acid and iron are widely improved with an average maximal tensile strength of 7 MPa, against 3.7 MPa for the multilayer film without the active components and with an elongation at break of respectively 1450% against 290%. However, despite the hydrophobicity of PCL, the water sorption of the TPS-based layer is only slightly reduced. The multilayer film shows active oxygen scavenging properties but the rate of this reaction is divided by two compared to the active film without PCL layers (15 days to reach less than 1% oxygen for the active film without PCL layers and approximately 30 days to reach the same oxygen level with the multilayer active film).

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?Antiplasticization? in starch-glycerol films?

Cited by 315 publications

References 6 publications

Retrogradation and Antiplasticization of Thermoplastic Starch

Retrogradation and Antiplasticization of Thermoplastic Starch

Multistep food plant processing at Grotta Paglicci (Southern Italy) around 32,600 cal B.P.

Research Article. Role of ascorbic acid and iron in mechanical and oxygen absorption properties of starch and polycaprolactone multilayer film

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