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© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
The science of
antioxidant selectionDr. Stefaan Van Dyck
Food Technologies EMEA
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Topics
• The oxidation process at molecular level
• Measuring shelf life in food matrices
• Prevention of oxidation - selection of the antioxidants.
• Natural plant materials as a sustainable alternative for
synthetic solutions.
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
History of Kemin
• Founded in 1961 by RW & Mary Nelson
o Independently owned by Nelson family
• 1,800+ employees worldwide
• Business operations in over 90 countries
o Manufacturing facilities located in 8 countries
• Over $600M annual revenue
• Over 200 patents
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
The oxidation process at
a molecular level
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
• Why are there 2 types of oxygen and why
do they behave so different?
2S+1 = 2 (0.5+ 0.5) +1 = 3 Triplet oxygen
Triplet and singlet oxygen
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Light (hn)
2S+1 = 2 (0) +1 = 1 Singlet oxygen
• Why are there 2 types of oxygen and why
do they behave so different?
Triplet and singlet oxygen
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
3O2
1O2
Shutterstock Images
T°
Insight in the oxidation process
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
3O2
1O2
Electron spin
Energy level
Nature
Reacts with
Rate C18:1 oxidation
22.4 kcal/mole
electron rich
non-radicals
3 x 104
0 kcal/mole
diradical
radicals
1
http://genchem.chem.wisc.edu/
Dia
ma
gn
etic
Triplet and singlet oxygen
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
RR'H H
RR'
-H
3O2
910
11
1213
9- and 13-hydroperoxide
3O2
R'1O2
910
11
1213
R'
O O
R
H
R
H
9-, 10-, 12- and
13-hydroperoxide
1O2
Reaction of oxygen with lipids
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
2h in light
0,0
5,0
10,0
15,0
20,0
25,0
30,0
35,0
40,0
2,4-Heptadienal Butenal 2-Heptenal
Oxidation product
AU
C (
Me
ga
un
its
)
Control + S* + S* + BHA + S* + Vit E + S* + b-Caroteneb
3O21O2
3O21O2
3O21O2
• 1O2 quencher has no impact on typical 3O2 degradation products
like hexanal
Effect of antioxidants on 1O2-degradation products
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Measuring shelf life in
foods
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
R-C=C-CH-R’
T (°C)
Cu ++ Fe ++
Light (hn)
IOO
R-C=C-CH-R’•
IH
•
R-C=C-CH-R’
O2Further reaction forming:
Aldehydes and acids (tertiary
reaction products)
Measured with OSI or Rancimat
Oxygen bomb
Peroxide value
AOMTBA, Anisidine-value,
SPME-GC/MS
Polar fraction with SEC or NIR
Overview -starting from the
oxidation cycle
ESR
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
HighHours80-100OSIAccelerated
MediumWeeks30-50Sensorial,
chemicalStandard
LowMonths25-30Sensorial,
chemical
Shelf life
Stress factorTesting timeTemp. (°C)AnalysisMethod
HighHours80-100OSIAccelerated
MediumWeeks30-50Sensorial,
chemicalStandard
LowMonths25-30Sensorial,
chemical
Shelf life
Stress factorTesting timeTemp. (°C)AnalysisMethod
Oxidation studies
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Traditional methods
• Peroxide value
• TBA value / p-Anisidine value
• Polar lipid fraction
• GC-MS headspace of volatiles
Accelerated methods
• AOM (Active oxygen method)
• OSI (Oxidative Stability Index)/Rancimat
• Oxygen bomb
Analysis of lipids
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Reference Information
Accelerated Oxidation
• Oxidative Stability Index (OSI) - (AOCS Official Method Cd 12b-92)
• The oil stability index (OSI) method measures the formation of volatile organic acids by monitoring the change
in electrical conductivity when the effluent from oxidizing oils is passed through water
• The oxidation process is accelerated by exposing oil samples to elevated temperatures in the presence of air
or oxygen
• The OSI method differs from ambient storage conditions by using a flow of air and high temperatures to
accelerate oxidation
• Used for antioxidant screening
Conditions
• Substrate: 50% High Oleic Sunflower oil with 50% canola oil
• 3 gram oil sample
• Temperature: 110°C
• Air flow: 10 Liter/ hour
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Accelerated Oxidation
Antioxidants tested in 50% high oleic sunflower oil (HSFO) + 50% Canola oil:
• TBHQ dry (Tertiary butyl hydroquinone)
• FORTIUM® GRC30 liquid: gallic acid, rosemary extract and citric acid
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Impact of formulation
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Polar antioxidants should be used to stabilize apolar lipids !
Polar antioxidants partition at the surface
Drawback : how to introduce polar AO in lipids?
Formulations:
The polar paradox
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Oxidation at the interphase
Fe2+
Fe3+
Metal reducing
agent
LOOH
LO
Inactivated by aquaous
phase antioxidant
Inactivated by surface
active antioxidant
Inactivated by lipid
phase antioxidant
React with other lipid
Biopolymer
interfase
Oil Water
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
The antioxidant toolbox
Green Tea BHA TBHQ BHT
Propyl Gallate
Rosemary
Spearmint Tocopherols
Acerola Citric Acid
Free Radical Scavengers Oxygen Reducer Chelator
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Which extract to choose?
Shutterstock Images
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
(Anti)oxidation in practice
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Food Technologies
• Delivers innovative, market-driven technologies that target the food
industry’s toughest challenges.
Antioxidants…to extend shelf life
Plant-derived
Antioxidants
Plant
ExtractsSynthetic
Food Safety…to control microbial growth
Synthetic Natural
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
LOW FAT (65%) MAYONNAISE
Conclusion:
The shelf life of mayonnaise could be increased by changing the packaging but NaturFORT™15 L was still required to
reach the desired shelf life
Reference: Kemin Internal Document 14-00002
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Shelf-life Extension of Frying Oils
and the Effect on the Fried Product
• Matrix:
o Sunflower oil (SFO)
o High oleic sunflower oil (HOSFO)
o Palm olein (PO)
• Treatment:
o Tocopherols (FORTIUM®TG20)
o Rosemary extract (FORTIUM® RG20)
• Finished product: tortilla crisps
• Accelerated storage, peroxide values
Reference: Kemin Internal Study INF-2011-00007
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Effect on the Fried Product
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50 60
PV
(m
eq/k
g f
at)
Time (days) at 40°C
HO-SFO control
HO-SFO + 0.15% RG20
Palm olein control
Palm olein + 0.15% RG20
SFO control
SFO + 0.15% RG20
Reference: Kemin Internal Study INF-2011-00007
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Dairy
Whole fat milk
Shutterstock Image
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Whole fat milk
Reference: Kemin Internal Study 15-00045 Development of Ingredients For Delaying Milk Fat Oxidation
0
1
2
3
4
5
6
7
FORTRA 101Dry 25 ppm
FORTRA 101Dry 60ppm
FORTRA 101Dry 120ppm
BHA 1 BHA 2
Me
q / k
g F
at
Figure 1. PV in whole fat milk
Day1 Day4 Day7
“BHA 1” is 200 ppm BHA based on dry weight (the upper legal limit in the European Union)
and “BHA 2” is 200 ppm BHA based on fat weight (the upper legal limit in the United States).
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
The challenge of
consistency and safety
of plant extracts
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Propagation
Agronomic Scale-up
Search for Genetic
Variation
Breeding
Optimize Selected
Clonal line(s)
Screen
Screen
Functionality
Biomass
Key screening criteria
Plant Breeding Program
Reference: Kemin Internal Pictures
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Innovation
Microwave drying – patent pending
• Microwave drying
o 4 chambers per line
o Reduces water from 80% to <15%
o Protects flavour and rosmarinic acid
Reference: Kemin Internal Pictures
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
Plant science & sustainability
• ‘Sustainably Grown’ is one of the most stringent certification
standards, supporting long-term sustainable agricultural
production
• Kemin is the first and one of the only to acquire third-party
‘Sustainably Grown’ certification for rosemary and spearmint
References: Kemin Internal Pictures
SCS global services
© Kemin Industries, Inc. and its group of companies 2015 All rights reserved. ®™ Trademarks of Kemin Industries, Inc., U.S.A.
THANK YOU FOR
YOUR ATTENTION
Stefaan Van Dyck
www.linkedin.com/in/stevady
Tel: 011 7047261 (JHB)
Tel: 021 9139818 (CPT)
www.Danlink.com