Mechanical and structural properties of solution-cast high-amylose maize starch films

Koch, Kristine; Gillgren, Thomas; Stading, Mats; Andersson, Roger

doi:10.1016/j.ijbiomac.2009.10.002

Cited by 47 publications

(20 citation statements)

References 17 publications

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“…The starch films became more flexible as the plasticizer concentration was increased, due to greater possibilities for chain displacement. In fact, as shown in Figure 2, the %E increased proportionally to the plasticizer content in the range studied, whereas TS showed a substantial decrease, in agreement with previous studies (MYLLÄRINEN et al, 2002;RYU et al, 2002;ARAUJO-FARRO et al, 2010;KOCH et al, 2010). Myllärinen et al (2002) and Zhang and Han (2006) obtained high amylose corn starch films using the traditional method under high pressure and temperature conditions.…”

Section: Relative Humiditysupporting

confidence: 91%

Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature

Bertuzzi

Gottifredi

Armada

2012

Braz. J. Food Technol.

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SummaryIn the present study, a better knowledge of the influence of plasticizer content, storage relative humidity and film thickness on the mechanical properties of high amylose corn starch based films gelatinized at low temperature, is presented. The mechanical properties, tensile strength and percentage of elongation at break of high amylose corn starch films plasticized with glycerol were evaluated using tension tests. The films exhibited an increase in elongation and a decrease in tensile strength with increasing plasticizer concentration. When the glycerol level was high, some fissures were detected in the dry films, possible due to phase separation (starch-glycerol) phenomena. Film crystallinity is related to the reorganization capacity of the polymer chain, and thus the relative film crystallinity should increase with plasticizer content (glycerol and water). The mechanical properties were found to be strongly dependent on the water content due to the hydrophilic nature of starch films. The influence of moisture sorption on tensile strength was similar to that of plasticization with glycerol. The relationship between polymer chain mobility and water content explained this behavior. Elongation suffered a different effect and maximum values were reached at 45% relative humidity. The final drop in elongation was due to a softening of the structure at high relative humidity. The thicker the film the longer the drying time required, leading to greater relative crystallinity due to the corresponding increase in the possibility for chain reorganization. As a consequence, linear increases in tensile strength and elongation were observed with film thickness over the whole range studied (30 to 100 µm). Key words: Starch films; Mechanical properties; Tensile strength; Elongation at break; Crystallinity. Autores | Authors Maria Alejandra BERTUZZI Instituto de Investigaciones para la Industria Química (INIQUI -CONICET)Av. Bolivia 5150, A4408FVY Salta -Argentina e-mail: bertuzzi@unsa.edu.ar Juan Carlos GOTTIFREDI Margarita ARMADA Instituto de Investigaciones para la Industria Química (INIQUI-CONICET)Salta - Argentina, Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature Propriedades mecânicas de filme a base de amido de milho de alto teor de amilose gelatinizado em baixa temperatura Campinas, v. 15, n. 3, p. 219-227, jul./set. 2012 http://dx.doi.org/10.1590/S1981-67232012005000015 ResumoNo presente estudo, é apresentado um melhor conhecimento da influência do teor em plastificante, da umidade relativa de armazenamento e da espessura do filme nas propriedades mecânicas do filme baseado em amido de milho de alto conteúdo de amilose, gelatinizado em baixa temperatura. As propriedades mecânicas, a resistência à tração e a porcentagem de alongamento na ruptura dos filmes de amido de milho de alta amilose plastificados com glicerol foram avaliadas utilizando-se testes da tensão. Os filmes apresentaram aumento do alongamento na ruptura e diminuição da resistência à traç...

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Section: Relative Humiditysupporting

confidence: 91%

Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature

Bertuzzi

Gottifredi

Armada

2012

Braz. J. Food Technol.

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“…Biopolymers' sensitivity to water and mechanical weakness are the biggest obstacles against replacing synthetic polymers with biopolymers. Mixing biopolymers with proteins (Zolfi et al 2014), carbohydrates (Motedayen et al 2013;Koch et al 2010), various combinations of several proteins and carbohydrates (Guerrero et al 2013;Arvanitoyannis et al 1998), lipids (Kowalczyk and Baraniak 2014;Shih et al 2011) and nano fillers (Almasi et al 2010;Shahabi-Ghahfarrokhi et al 2015b) are the common methods to overcome the drawbacks of biopolymers.…”

Section: Introductionmentioning

confidence: 99%

Modification of functional properties of pullulan–whey protein bionanocomposite films with nanoclay

2015

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In this study, biodegradable nanocomposite film composed of pullulan -whey protein isolate (WPI) -montmorillonite (MMT) were developed and characterized as a function of incorporating various amounts of MMT nanoparticles (0, 1, 3 and 5 % wt). Results showed that the watervapor permeability, moisture content, moisture absorption and water solubility decreased when the nano-MMT content was increased. Tensile strength improved and elongation at break simultaneously decreased with increasing MMT content. The glass transition temperature (T g (and melting-point temperature (T m ) increased with increasing nano-MMT content. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis revealed uniform distribution of MMT into the polymer matrix. Atomic force microscopy (AFM) showed enhancement of films' roughness with increasing MMT content.

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“…Koch et al (2010) examined the effects of manufacturing time, processing temperature, and plasticizer content on the molecular structure of high-amylose maize starch films. Koch et al (2010) examined the effects of manufacturing time, processing temperature, and plasticizer content on the molecular structure of high-amylose maize starch films.…”

Section: Castingmentioning

confidence: 99%

Biodegradable Starch Nanocomposites

García

Famá

D’Accorso

et al. 2015

Advanced Structured Materials

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Biodegradable thermoplastic materials offer great potential to be used in food packaging or biomedical industry. In this chapter we will present a review of the research done on starch and starch nanocomposites. In the case of nanocomposites based on starch, special attention will be given to the influence of starch nanoparticles, cellulose whiskers, zinc oxide nanorods, antioxidants, and antimicrobial inclusion on the physicochemical properties of the materials. The discussion will be focused on structural, mechanical, and barrel properties as well as on degradation, antibacterial and antioxidant activities. Finally, we will discuss our perspectives on how future research should be oriented to contribute in the substitution of synthetic materials with new econanocomposites.

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Mechanical and structural properties of solution-cast high-amylose maize starch films

Cited by 47 publications

References 17 publications

Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature

Mechanical properties of a high amylose content corn starch based film, gelatinized at low temperature

Modification of functional properties of pullulan–whey protein bionanocomposite films with nanoclay

Biodegradable Starch Nanocomposites

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