World Grain - June 2014 - 90
RICE QUARTERLY
Methods for stabilizing
RICE BRAN
T
raditional heating methods such as hot air, drum drying
and dry extrusion subject rice bran to severe and nonuniform heating. This damaged valuable components
and results in high energy consumption.
Researchers in the Healthy Processed Foods Unit of
USDA-ARS and Department of Biological and Agricultural
Engineering at the University of California, Davis, looked to
develop alternative techniques for stabilizing rice bran. They
looked at infrared radiation (IR), ultraviolet (UV) and pulsed
electric field (PEF).
As part of the study, researchers looked at the effects of IR
heating and tempering treatments on moisture loss, milling
quality and enzyme inactivation of rough rice with different
initial moisture contents. They also looked at the impact of
UV and PEF treatments on enzyme inactivation of brown rice
and rice bran. Finally, they provided recommendations for
conducting the most effective stabilization approach.
The study results showed that high drying rates, good milling quality and effective lipase inactivation of rough rice is
possible with a short IR heating time followed by tempering
treatment for at least three hours.
The project leader was Zhongli Pan, Processed Food
Research Unit, and Pan and Griffiths Atungulu were the lead
investigators for the study.
IR HEATING, TEMPERING
Medium grain rice at three moisture contents (32.51%,
25.54% and 20.07%) were heated using an IR device developed in the Food Processing Laboratory at UC Davis. The
samples were heated for one and two drying passes under
radiation intensity of 5,000 W/m2. They were heated for 55
seconds to reach a surface temperature of 60 degrees C during
each drying pass.
The mass loss during IR heating and the initial moisture
content were used to calculate the moisture loss during the
heating period. The moisture loss was calculated as the difference between the initial moisture content and the moisture
90
by Susan Reidy
High drying rates, good milling
quality possible with short IR
heating time, tempering treatment
content after IR heating and is reported as percentage points.
After IR heating, the tempering treatment was conducted by
keeping rice samples in closed containers placed in an incubator set at temperature of 60 degrees C for various durations (1,
2, 3, 4 and 5 hours). After the tempering treatment, samples
were allowed to cool naturally to the room conditions.
Moisture loss. After one drying pass, the moisture loss
during IR heating only was 1.7%, 2.2% and 2.9% for samples with initial moisture contents of 20.06%, 25.53% and
32.50%, respectively. After two drying passes, the moisture
loss during IR heating was 5.8% for samples with initial
moisture content of 32.5%.
After one drying pass, the total moisture loss during IR heating, tempering and cooling treatments, were 3.3%, 3.8% and
5.6% for samples with initial moisture contents of 20.06%,
25.53% and 32.5%, respectively. The total moisture loss during two drying passes was 12.2% for samples with initial
moisture content of 32.5%.
The results show that high drying rate can be achieved using
IR heating for a short time. Tempering treatment significantly
improved the moisture removal during cooling. It reduced the
moisture gradient in rice kernels and allowed the moisture to
equilibrate before the rice kernels were cooled. Tempering is
a critical step to increase the moisture removal during cooling
of the rough rice, researchers said.
Milling quality. After IR treatment, the milling quality was evaluated. Treated and untreated rice samples were
dehulled and milled three times to achieve well-milled rice
June 2014 / World Grain / www.World-Grain.com
http://www.World-Grain.com
World Grain - June 2014
Table of Contents for the Digital Edition of World Grain - June 2014
World Grain - June 2014
Table of Contents
From the Editor-in-chief - Urbanization sways future of food
Calendar of Events
Australian Grains Industry Conference
News Review - Wilmar, First Pacific to acquire Goodman Fielder
With CFP acquisition, Milner renamed Grain Craft
Smaller harvest drops GrainCorp profit 43%
CBH adds to executive team
Cargill completes Vietnamese feed plant expansion
Tiger Brands to mothball several Nigerian flour mills
ADM’s first-quarter earnings hurt by weather
ADM appoints oilseed vice-president
Alliance Grain results up in first quarter
Ingredion’s earnings drop on weather costs
African leaders urged to boost agriculture
Richardson increases canola capacity
Former president of James Richardson & Sons dies
The Andersons earnings up on ethanol, rail
Bunge reports loss in first quarter
Grain Market Review - Rice
Country Focus - Romania
Feature - Serving a Changing Market
Interflour’s growth strategy
The Flour Fortification Initiative
Feature - Canada in the spotlight
Next year’s event
Feature - A perfect storm
Feature - Grain Storage and Handling Projects
Feature - Opportunities and Challenges
Feature - Cereals Europe 2014
Feature - De Decco's path to success
Ownership structure
Feature - Global Grain outlook
Growth in livestock sector translates into more feed, protein demand
Rice Quarterly - Methods for stabilizing rice bran
Rice News Roundup - Group changes name to Food Fortication Initiative
India’s basmati exports to Iran slow
Thailand hopes for comeback in jasmine rice market
Gambia can produce 2 million tonnes of rice
Pakistan rice exports up 20.19%
Philippine farmers bring in post-typhoon harvest
Pakistan wants rice export re-examined
Feature - IAOM MEA celebrates 25 years
Grain Operations - Mycotoxin management
Technical Profile - Enhancing cozonac
Supplier News
Product Showcase
World Grain Archive
Ad Index/Reader Information Form International Faxback Program
World Grain - June 2014 - World Grain - June 2014
World Grain - June 2014 - 2
World Grain - June 2014 - 3
World Grain - June 2014 - 4
World Grain - June 2014 - Table of Contents
World Grain - June 2014 - 6
World Grain - June 2014 - 7
World Grain - June 2014 - From the Editor-in-chief - Urbanization sways future of food
World Grain - June 2014 - 9
World Grain - June 2014 - Australian Grains Industry Conference
World Grain - June 2014 - 11
World Grain - June 2014 - With CFP acquisition, Milner renamed Grain Craft
World Grain - June 2014 - 13
World Grain - June 2014 - CBH adds to executive team
World Grain - June 2014 - Cargill completes Vietnamese feed plant expansion
World Grain - June 2014 - Tiger Brands to mothball several Nigerian flour mills
World Grain - June 2014 - ADM appoints oilseed vice-president
World Grain - June 2014 - Ingredion’s earnings drop on weather costs
World Grain - June 2014 - African leaders urged to boost agriculture
World Grain - June 2014 - Richardson increases canola capacity
World Grain - June 2014 - Bunge reports loss in first quarter
World Grain - June 2014 - Grain Market Review - Rice
World Grain - June 2014 - 23
World Grain - June 2014 - Country Focus - Romania
World Grain - June 2014 - 25
World Grain - June 2014 - 26
World Grain - June 2014 - 27
World Grain - June 2014 - Feature - Serving a Changing Market
World Grain - June 2014 - Interflour’s growth strategy
World Grain - June 2014 - The Flour Fortification Initiative
World Grain - June 2014 - 31
World Grain - June 2014 - Feature - Canada in the spotlight
World Grain - June 2014 - 33
World Grain - June 2014 - Next year’s event
World Grain - June 2014 - 35
World Grain - June 2014 - 36
World Grain - June 2014 - 37
World Grain - June 2014 - 38
World Grain - June 2014 - 39
World Grain - June 2014 - Feature - A perfect storm
World Grain - June 2014 - 41
World Grain - June 2014 - 42
World Grain - June 2014 - 43
World Grain - June 2014 - 44
World Grain - June 2014 - 45
World Grain - June 2014 - Feature - Grain Storage and Handling Projects
World Grain - June 2014 - 47
World Grain - June 2014 - 48
World Grain - June 2014 - 49
World Grain - June 2014 - 50
World Grain - June 2014 - 51
World Grain - June 2014 - 52
World Grain - June 2014 - 53
World Grain - June 2014 - 54
World Grain - June 2014 - 55
World Grain - June 2014 - 56
World Grain - June 2014 - 57
World Grain - June 2014 - 58
World Grain - June 2014 - 59
World Grain - June 2014 - 60
World Grain - June 2014 - 61
World Grain - June 2014 - 62
World Grain - June 2014 - 63
World Grain - June 2014 - Feature - Opportunities and Challenges
World Grain - June 2014 - 65
World Grain - June 2014 - 66
World Grain - June 2014 - 67
World Grain - June 2014 - Feature - Cereals Europe 2014
World Grain - June 2014 - 69
World Grain - June 2014 - 70
World Grain - June 2014 - 71
World Grain - June 2014 - 72
World Grain - June 2014 - 73
World Grain - June 2014 - 74
World Grain - June 2014 - 75
World Grain - June 2014 - Feature - De Decco's path to success
World Grain - June 2014 - 77
World Grain - June 2014 - 78
World Grain - June 2014 - 79
World Grain - June 2014 - Ownership structure
World Grain - June 2014 - 81
World Grain - June 2014 - 82
World Grain - June 2014 - 83
World Grain - June 2014 - Feature - Global Grain outlook
World Grain - June 2014 - 85
World Grain - June 2014 - Growth in livestock sector translates into more feed, protein demand
World Grain - June 2014 - 87
World Grain - June 2014 - 88
World Grain - June 2014 - 89
World Grain - June 2014 - Rice Quarterly - Methods for stabilizing rice bran
World Grain - June 2014 - 91
World Grain - June 2014 - 92
World Grain - June 2014 - 93
World Grain - June 2014 - 94
World Grain - June 2014 - 95
World Grain - June 2014 - 96
World Grain - June 2014 - 97
World Grain - June 2014 - India’s basmati exports to Iran slow
World Grain - June 2014 - 99
World Grain - June 2014 - Pakistan rice exports up 20.19%
World Grain - June 2014 - 101
World Grain - June 2014 - Pakistan wants rice export re-examined
World Grain - June 2014 - 103
World Grain - June 2014 - Feature - IAOM MEA celebrates 25 years
World Grain - June 2014 - 105
World Grain - June 2014 - Grain Operations - Mycotoxin management
World Grain - June 2014 - 107
World Grain - June 2014 - 108
World Grain - June 2014 - 109
World Grain - June 2014 - Technical Profile - Enhancing cozonac
World Grain - June 2014 - 111
World Grain - June 2014 - 112
World Grain - June 2014 - 113
World Grain - June 2014 - Supplier News
World Grain - June 2014 - 115
World Grain - June 2014 - 116
World Grain - June 2014 - 117
World Grain - June 2014 - 118
World Grain - June 2014 - 119
World Grain - June 2014 - Product Showcase
World Grain - June 2014 - World Grain Archive
World Grain - June 2014 - Ad Index/Reader Information Form International Faxback Program
World Grain - June 2014 - 123
World Grain - June 2014 - 124
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http://digital.world-grain.com/sosland/wg/2006_08_01
http://digital.world-grain.com/sosland/wg/2006_07_01
http://digital.world-grain.com/sosland/wg/2006_06_01
http://digital.world-grain.com/sosland/wg/2006_05_01
http://digital.world-grain.com/sosland/wg/2006_04_01
http://digital.world-grain.com/sosland/wg/2006_03_01
http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
http://digital.world-grain.com/sosland/wg/2005_12_01
http://digital.world-grain.com/sosland/wg/2005_11_01
http://digital.world-grain.com/sosland/wg/2005_10_01
http://digital.world-grain.com/sosland/wg/2005_09_01
http://digital.world-grain.com/sosland/wg/2005_08_01
http://digital.world-grain.com/sosland/wg/2005_07_01
http://digital.world-grain.com/sosland/wg/2005_06_01
http://digital.world-grain.com/sosland/wg/2005_05_01
http://digital.world-grain.com/sosland/wg/2005_04_01
http://digital.world-grain.com/sosland/wg/2005_03_01
http://digital.world-grain.com/sosland/wg/2005_02_01
http://digital.world-grain.com/sosland/wg/2005_01_01
http://digital.world-grain.com/sosland/wg/2004_12_01
http://digital.world-grain.com/sosland/wg/2004_11_01
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_01
http://digital.world-grain.com/sosland/wg/2004_09_01
http://digital.world-grain.com/sosland/wg/2004_08_01
https://www.nxtbookmedia.com