Physical properties of kafirin films Enviropak final meeting Mats Stading Katarina Nilsson Susanna...
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Transcript of Physical properties of kafirin films Enviropak final meeting Mats Stading Katarina Nilsson Susanna...
Physical properties of kafirin films
Enviropak final meeting
Mats StadingKatarina NilssonSusanna Edrud
Siw KidmanAnnika AltskärPaola 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*, Tg)
• Barrier properties (WVP, OP)• Moisture content• Microstructure (LM, CLSM, TEM)
Plasticizers testedPlasticizer/protein
Plasticizer
0.01 0.05 0.10 0.20 0.30 0.40
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
0
2
4
6
8
10
12
14
16
18
20
0.2 0.3 0.4
Moisture content
Ethanol
Plasticizer/kafirin
Acetic acidMC [% w/w]
0
10
20
30
40
50
60
70
0.2 0.3 0.4
Plasticizer/protein
Tg
[°C
]
Glass transition temperature ofkafirin and zein films
Thermoplastic zeinfilms from IMBC
PEG
PEG
LA
Kafirin
Zein
Glycerol/PEG/la1:1:1
0
5
10
15
20
0.2 0.3 0.4
Water Vapour PermeabilityComparison with other materials
AmyloseAmylopectin
glycerol
Plasticizer/kafirin
WVP [g mm/m²h kPa]
0.4 0.48 0.83
Whey protein
glycerol
sorbitol
EVOHLDPE
0
20
40
60
80
100
120
140
0.2 0.3 0.4
Oxygen Permeability
Plasticizer/kafirin
OP [cm³ m/m² d kPa]
UP kafirinpreparation
AmyloseAmylopectin
glycerol
0.4 0.3 0.83
Whey protein
glycerol
sorbitol
LDPE1900
EVOH
Ethylene Permeability
0.001
2
4
11 10
0
2
4
6
8
10
12
Pureprotein
+10% lipid +20% lipid +30% lipid +40% lipid
Eth
ylen
e tr
ansm
issi
on
MS
uni
ts x
10
-11
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
11mm
11mm
0.10.1mm