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Airless Cold Grinding Essay

1888 words - 8 pages

Taming of the Golden Bean
Rajendra P. Gupta
ProSoya Inc.
2-5310 Canotek Road, Ottawa, Canada K1J 9N5

For time immemorial, soybean has been known as the best source of plant protein
and is rich in nutritive minerals and dietary fiber. Recently, nutraceutical aspects of
the bean have become well recognized even in the western world. Foods derived
from soybean have been shown to selectively lower the bad cholesterol and aid in
reducing the chances of developing cancer. In women, soyfoods consumption
minimizes the menopause symptoms. For this reason and because of its color,
soybean is aptly referred as the Golden Bean.
The use of soybean in foods has been rather limited outside the ...view middle of the document...

The new patented invention has been developed into a technology that has been
used to produce good tasting dairy-like soyfoods and beverages at all levels.
Commercial and industrial scale equipment for producing soymilk using this
technology, in capacities ranging from 50 L/H to 10,000 L/H of finished soy
beverages, are currently operational in various parts of the world, including
Canada, the USA, UK, Russia, and India. A household soymilk appliance is under
development and has recently been tested by NASA for their manned mission to
Mars.
There are four basic methods of producing soymilk. These methods are compared
in Table 1.

1

Method >

Traditional

Hot-Grind

Hot-Blanch

Soybeans

Whole
Any Type

Processing
Chemicals
Bean
Soaking
Process

Not
Required
Yes

Whole or
Dehulled
High Quality
NaHCO3,
NaOH, HCl,...
Optional

Whole or
Dehulled
Good Quality
NaHCO3,
NaOH, HCl,...
Hot Blanch

Cold Grind in
Water
Cook/Filter
Or
Filter/Cook

Hot Grind in
Water
Cook /
Vacuum /
Filter

Soymilk

Dissolved
Solids

Odor
Flavoring
Mouthfeel
Protein Yield
Basic Plant
Cost
Soymilk
Plant
Available
From

Rancid
Very Difficult
Smooth
70-90%
Low

Partly
Dissolved
Solids
Less Rancid
Difficult
Chalky
60-80%
Medium to
Very High
Alfa-Laval
Kibun
Mitsubishi
APV-DTD

Sato
Kawanishi
Kurihara
Takai, etc.

Airless
Cold-Grind
Whole or
Dehulled
Any Type
Not
Required
Preferred

Airless Cold
Hot Grind in
Grind in Water
Water
Cook/Vacuum
Cook and
/ Filter Or
High Pressure
Airless Filter
Homogenize
Cook
/Vacuum
Dissolved
Mostly
Solids
Suspended
Solid
Roasted Nuts
Cereal
Easy
Easy
Very Chalky
Smooth
Up to 98%
70-90%
High
Low to
Medium
ProSoya
INTSOY
ASSOY
Kibun
SSP
Pant Nagar

The age old Chinese and Japanese method (traditional method) uses cold grinding
of well soaked and rinsed soybean in a stone mill with water. The resulting puree
is mixed with additional water and cooked in an open caldron or in a pressure
cooker for an adequate time to make it digestible. The cooked slurry is filtered
through a filter bag to extract soymilk. The okara (residue in the bag) is pressed to
squeeze out more soymilk. The squeezed okara is mixed with water and filtered
and pressed again to obtain thin soymilk. This thin soymilk is either mixed with the
soymilk already extracted or used in place of water in the stone mill when grinding
soybean in order to improve soymilk yield. This method gives soymilk with
excellent mouth-feel and good yield. However, the soymilk has very high level of
the rancid-oil-like smell which is rather repulsive, especially when soymilk is
consumed as a cold beverage rather than as a hot drink.
The other most commonly used method is the hot-grind method in its variety of
proprietary and sometimes patented forms. Essentially, it involves grinding
soybeans (with hulls or without, soaked or dry) with hot, almost...

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