Depolymerization of barley starch during extrusion in water glycerol mixtures

Olavi Myllymäki, T. Eerikäinen, Tapani Suortti, Pirkko Forssell, Pekka Linko, Kaisa Poutanen

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

For the purpose of producing thermoplastic starch, barley starch was extruded in mixtures of water and glycerol in a twin-screw extruder equipped with a specially constructed slit die. The process parameters — water feed (15–25 g/min), glycerol feed (15–25 g/min), barrel temperature (150–200 °C) and screw speed (272–400 rpm) — were varied according to a statistical experimental design consisting of 28 trials. The values of the process parameters were selected to lie within ranges technically feasible with the equipment. Starch amylopectin was clearly depolymerized, and starch retained on average molar mass at the level of (13–37) × 106g/mol. Intrinsic viscosities decreased from 230 mL/g to about 150 mL/g. The tensile strength depended only on glycerol content in the experimental area, varying from 4.5 to 16 MPa. The specific mechanical energy consumption was 85–240 W.h/kg. In all trials, water had only a slightly greater effect than did glycerol on the dependent variables. All the models of dependent variables were statistically very significant. In the experimental range used it was possible to produce thermoplastic starch with relatively high molar mass and mechanical strength.

Original languageEnglish
Pages (from-to)351 - 358
Number of pages8
JournalLebensmittel-Wissenschaft & Technologie
Volume30
Issue number4
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

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barley starch
depolymerization
Hordeum
extrusion
Starch
Glycerol
glycerol
starch
thermoplastics
Water
screws
water
molecular weight
extruders
amylopectin
Amylopectin
tensile strength
Tensile Strength
viscosity
Viscosity

Cite this

Myllymäki, Olavi ; Eerikäinen, T. ; Suortti, Tapani ; Forssell, Pirkko ; Linko, Pekka ; Poutanen, Kaisa. / Depolymerization of barley starch during extrusion in water glycerol mixtures. In: Lebensmittel-Wissenschaft & Technologie. 1997 ; Vol. 30, No. 4. pp. 351 - 358.
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Depolymerization of barley starch during extrusion in water glycerol mixtures. / Myllymäki, Olavi; Eerikäinen, T.; Suortti, Tapani; Forssell, Pirkko; Linko, Pekka; Poutanen, Kaisa.

In: Lebensmittel-Wissenschaft & Technologie, Vol. 30, No. 4, 1997, p. 351 - 358.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Depolymerization of barley starch during extrusion in water glycerol mixtures

AU - Myllymäki, Olavi

AU - Eerikäinen, T.

AU - Suortti, Tapani

AU - Forssell, Pirkko

AU - Linko, Pekka

AU - Poutanen, Kaisa

PY - 1997

Y1 - 1997

N2 - For the purpose of producing thermoplastic starch, barley starch was extruded in mixtures of water and glycerol in a twin-screw extruder equipped with a specially constructed slit die. The process parameters — water feed (15–25 g/min), glycerol feed (15–25 g/min), barrel temperature (150–200 °C) and screw speed (272–400 rpm) — were varied according to a statistical experimental design consisting of 28 trials. The values of the process parameters were selected to lie within ranges technically feasible with the equipment. Starch amylopectin was clearly depolymerized, and starch retained on average molar mass at the level of (13–37) × 106g/mol. Intrinsic viscosities decreased from 230 mL/g to about 150 mL/g. The tensile strength depended only on glycerol content in the experimental area, varying from 4.5 to 16 MPa. The specific mechanical energy consumption was 85–240 W.h/kg. In all trials, water had only a slightly greater effect than did glycerol on the dependent variables. All the models of dependent variables were statistically very significant. In the experimental range used it was possible to produce thermoplastic starch with relatively high molar mass and mechanical strength.

AB - For the purpose of producing thermoplastic starch, barley starch was extruded in mixtures of water and glycerol in a twin-screw extruder equipped with a specially constructed slit die. The process parameters — water feed (15–25 g/min), glycerol feed (15–25 g/min), barrel temperature (150–200 °C) and screw speed (272–400 rpm) — were varied according to a statistical experimental design consisting of 28 trials. The values of the process parameters were selected to lie within ranges technically feasible with the equipment. Starch amylopectin was clearly depolymerized, and starch retained on average molar mass at the level of (13–37) × 106g/mol. Intrinsic viscosities decreased from 230 mL/g to about 150 mL/g. The tensile strength depended only on glycerol content in the experimental area, varying from 4.5 to 16 MPa. The specific mechanical energy consumption was 85–240 W.h/kg. In all trials, water had only a slightly greater effect than did glycerol on the dependent variables. All the models of dependent variables were statistically very significant. In the experimental range used it was possible to produce thermoplastic starch with relatively high molar mass and mechanical strength.

U2 - 10.1006/fstl.1996.0186

DO - 10.1006/fstl.1996.0186

M3 - Article

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SP - 351

EP - 358

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SN - 0023-6438

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