Thermoplastic starch from corn and wheat: a comparative study based on amylose content

Altayan, Mhd. Mazen; Darouich, Tammam Al; Karabet, François

doi:10.1007/s00289-020-03262-9

Cited by 29 publications

(26 citation statements)

References 54 publications

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“…These ash content findings are consistent with the literature where in a comparison between food‐grade wheat and corn starches, ash contents of 0.011% and 0.103%, respectively, were reported. [ 9 ]…”

Section: Resultsmentioning

confidence: 99%

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Biocomposites from Thermoplastic Postindustrial Waste Starches Filled with Mineral Fillers for Single‐Use Flexible Packaging

Scharnowski

Rodriguez‐Uribe

Pal

et al. 2022

Macro Materials & Eng

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Plasticized starch (PS) materials hold a fundamental role in the design of novel biodegradable and compostable plastics aimed to reduce global single‐use plastic wastes. This work exemplifies the plasticization of postindustrial waste wheat starch (pWWS) and postindustrial corn starch (pWCS) with a comparison to food‐grade corn starch (pCS) by introducing technical waste glycerol (25%) along with urea (5%) and water. The PS (30%) is blended with 70% poly(butylene adipate‐co‐terephthalate) (PBAT) to design a matrix with optimized mechanical properties. As a result, the inclusion of pWCS and pCS shows similar impact strength and melt flow index (MFI) values. Further, the mineral fillers, i.e., talc and calcium carbonate (CaCO3) (25%), are introduced into the PBAT/PS (70%/30%) matrix to explore the effect on MFI, mechanical, thermal, and morphological properties. Scanning electron microscopy analysis reveals good dispersion of PS particles and mineral fillers into the PBAT. Adding talc into the PBAT/pWWS and PBAT/pCS blends shows significantly higher modulus (≈134% and ≈105%, respectively) and heat deflection temperature (HDT) (7.8% and 9.3%, respectively). The addition of 25% CaCO3 results in the impact strength of PBAT/pWWS being improved by ≈20%. Due to talc's lamellar platelet structure and better dispersion, the inclusion of talc into the PBAT/PS blends shows improved rheological properties compared to that of CaCO3.

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Section: Resultsmentioning

confidence: 99%

“…A thermogravimetric analyzer (TGA) (Q500, TA Instruments, USA) was used in the determination of the ash content of all three [9] starches. The machine was set to equilibrate at 50 °C where it then remained isothermal for 5 min before ramping 50 °C min −1 to 110 °C.…”

Section: Characterizationmentioning

confidence: 99%

Biocomposites from Thermoplastic Postindustrial Waste Starches Filled with Mineral Fillers for Single‐Use Flexible Packaging

Scharnowski

Rodriguez‐Uribe

Pal

et al. 2022

Macro Materials & Eng

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“…The thermoplasticization of achira starch modified its X-ray pattern, because amylose forms complexes identified as V A , V H , and E H crystals depending on the presence of plasticizers and the extrusion parameters. [25] The V H structure is formed in TPS with high water content [35] ; so the transformation from V A to V H depends on the moisture content of the material, the storage time, and the hygroscopic capacity of the plasticizer; therefore, when glycerol is used as a plasticizer, the transformation from V A to V H is rapid due to its high hygroscopicity. [28,36] V-type structure is also attributed to complexes resulting from the association of amylose chains with OS groups.…”

Section: Xrdmentioning

confidence: 99%

Preparation and Characterization of Thermoplastics Achira (Canna indica L.) Starch by Three Succination Methods

et al. 2022

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Thermoplastic starches (TPS) from achira, succinated to 3% and 5% octenyl succinate anhydrous (OSA) using aqueous medium, reactive extrusion (REX), and in situ are developed (TPS 3A, TPS 5A, TPS 3R, TPS 5R, TPS 3I, and TPS I5). The physicochemical properties are studied to explore the effect of different methods applied to modified thermoplastic starches. Analysis of infrared spectroscopy and nuclear magnetic resonance of proton shows that the methods used in succination are effective in esterifying starches. REX and the in situ method make it possible to obtain materials with higher degree of substitution (DS), from 0.011 to 0.050, affecting thermoplasticization. The aqueous method promotes greater thermal stability, TPS 3A and TPS 5A are degraded at temperature ranges from 135 to 279 °C and shows a pattern similar to counterpart native TPS 0 (sample control), unlike the REX and the in situ method, both of them beginning degrading at lower temperature values than all starches. Mechanical properties and contact angle are influenced by the processing method and not by DS or glycerol content. All achira TPS developed are a feasible alternative for application in the industry dedicated to the processing of bioplastics.

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“…[ 4 ] The created homogeneous melt is known as thermoplastic starch (TPS) which contains the characteristics of thermoplastic polymers. [ 5 ] This organic polymer is completely compatible with the environment, and can be incorporated into the soil as an organic fertilizer. [ 6 ] While, the accumulation of petrochemical‐based plastic materials can contribute to environmental pollution and degradation.…”

Section: Introductionmentioning

confidence: 99%

“…[1] This polysaccharide -a renewable polymer from a great variety of crops, that is, potato, corn, rice, cassava, and as well as Emmer wheat-is one of the raw materials for biodegradable targets. [2] In the granular form of starch, it is mostly composed of linear amylose which includes of 𝛼- (1)(2)(3)(4)-linked D-glucose, and highly branched amylopectin which possesses of 𝛼- (1)(2)(3)(4) and 𝛼- (1)(2)(3)(4)(5)(6) DOI: 10.1002/star.202100185 glycosidic linkages. [3] Starch can be considered as a crystalline polymeric material; when it mixes with a limited amount of water or other plasticizers, and subjects to heat and also shear, its crystals undergoes spontaneous destructurization.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics, Kinetics and Thermodynamics of Thermal Degradation Reaction, and Hydrophobicity of Corn Starch Affected by Chemical and Physical Modifications

2022

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In this work, glacial‐acetic (A) and citric (C) acids from organic acids “family with one and three functional groups, respectively", oleic acid (O) from the fatty acids family and sodium acetate (S) are used for esterification of corn starch in solution in the absence and the presence of 15%wt glycerin as a physical modifier. Discoloration test using CIELAB and as well as thermal gravimetric analysis shows that the glacial‐acetic acid leads to lower reduction in thermal characteristics of the modified starch. The variations of thermal properties start from T > 112 °C, T>136 °C, T>100 °C, and T> 124 °C for the modified starches with C, A, O, and S reagents, respectively, and the changes are constant beyond the amount of 4%wt reagent. The evaluations of kinetics and thermodynamics of thermal degradation reaction for the modified starches via a Coats–Redfern (CR) model prove that the acetic acid causes more activation energy for degradation compared to other reagents. Also, acetic acid‐modified starch demonstrates the highest hydrophobicity among other modified starches – even native starch – in the moisture sorption examination at 75% relative humidity (RH). The results illustrate that glycerin has the worst effect on the thermal and hydrophobicity properties of the modified starches.

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Thermoplastic starch from corn and wheat: a comparative study based on amylose content

Cited by 29 publications

References 54 publications

Biocomposites from Thermoplastic Postindustrial Waste Starches Filled with Mineral Fillers for Single‐Use Flexible Packaging

Biocomposites from Thermoplastic Postindustrial Waste Starches Filled with Mineral Fillers for Single‐Use Flexible Packaging

Preparation and Characterization of Thermoplastics Achira (Canna indica L.) Starch by Three Succination Methods

Thermal Characteristics, Kinetics and Thermodynamics of Thermal Degradation Reaction, and Hydrophobicity of Corn Starch Affected by Chemical and Physical Modifications

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