Physical properties of kafirin films Enviropak final meeting Mats Stading Katarina Nilsson Susanna Edrud Siw Kidman Annika Altskär Paola Olofsson Maria.

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Presentation transcript:

Physical properties of kafirin films Enviropak final meeting Mats Stading Katarina Nilsson Susanna Edrud Siw Kidman Annika Altskär Paola Olofsson Maria Petersson SIK – The Swedish Institute for Food and Biotechnology Structure and Material Design Göteborg, Sweden

Samples Kafirin from CSIR large batch Defatted zein from Sigma Cast and thermoplastic films (from Sammy) Plasticizer/protein: 0, 0.2, 0.3 and 0.4

Characterization Fracture strength (E,  b,  b ) Thermomechanical properties, DMA (G*, T g ) Barrier properties (WVP, OP) Moisture content Microstructure (LM, CLSM, TEM)

Plasticizers tested Plasticizer/protein Plasticizer Glycerol PEG PPG Lactic acid (LA) Gly/PEG (1:3, 1:1, 3:1) Gly/PPG (1:3, 1:1, 3:1) Gly/PEG/LA (1:1:1) Gly/PPG/LA (1:1:1) Acetyl. monoglyceride EPZ Acetyl. monoglyceride Acetem Castor-oil derivate Diethanolamine Tyrosine Tryptophane Oleic acid Palmitic acid

Stress at break Ethanol Plasticizer/kafirin Acetic acid  b [MPa]

Strain at break Ethanol Plasticizer/kafirin Acetic acid  b [MPa]

Moisture content Ethanol Plasticizer/kafirin Acetic acid MC [% w/w]

Glass transition temperature of kafirin and zein films Thermoplastic zein films from IMBC PEG LA Kafirin Zein Glycerol/PEG/la 1:1:1

Water Vapour Permeability Comparison with other materials Amylose Amylopectin glycerol Plasticizer/kafirin WVP [g mm/m²h kPa] Whey protein glycerol sorbitol EVOH LDPE

Oxygen Permeability Plasticizer/kafirin OP [cm³  m/m² d kPa] UP kafirin preparation Amylose Amylopectin glycerol Whey protein glycerol sorbitol LDPE 1900 EVOH

Ethylene Permeability

Thermoplastic zein films 25% PEG400, 50rpm, 60°C, 600s Fine structures of zein films Micropores Processing temperatures (60°C, 70°C, 80°C) do not seem to change the microstructure of the thermoplastic films 1m1m1m1m 1m1m1m1m 0.1  m

60°C Observations Bigger micropores at higher processing temperature Less striated structure at higher processing temperature  more even melting No microstructural difference between lauric acid and PEG plasticization Thermoplastic kafirin films 80°C 20  m 1m1m1m1m 1m1m1m1m