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KENT’S TECHNOLOGY
OF CEREALS
Related titles
Kent’s Technology of Cereals, 4th Edition; Woodhead Publishing
(ISBN 978-1-85573-660-3)
Cereal Biotechnology; Woodhead Publishing
(ISBN 978-1-85573-498-2)
Woodhead Publishing Series in Food Science,
Technology and Nutrition
KENT’S
TECHNOLOGY OF
CEREALS
AN INTRODUCTION FOR
STUDENTS OF FOOD SCIENCE
AND AGRICULTURE
FIFTH EDITION
Kurt A. Rosentrater
A.D. Evers
Woodhead Publishing is an imprint of Elsevier
The Officers’ Mess Business Centre, Royston Road, Duxford, CB22 4QH, United Kingdom
50 Hampshire Street, 5th Floor, Cambridge, MA 02139, United States
The Boulevard, Langford Lane, Kidlington, OX5 1GB, United Kingdom
This book and the individual contributions contained in it are protected under copyright
by the Publisher (other than as may be noted herein).
Notices
Knowledge and best practice in this field are constantly changing. As new research and
experience broaden our understanding, changes in research methods, professional
practices, or medical treatment may become necessary.
Practitioners and researchers must always rely on their own experience and knowledge in
evaluating and using any information, methods, compounds, or experiments described
herein. In using such information or methods they should be mindful of their own safety
and the safety of others, including parties for whom they have a professional
responsibility.
To the fullest extent of the law, neither the Publisher nor the authors, contributors, or
editors, assume any liability for any injury and/or damage to persons or property as a
matter of products liability, negligence or otherwise, or from any use or operation of any
methods, products, instructions, or ideas contained in the material herein.
Contents
Biography xi
Preface to the fifth edition xiii
Preface to the fourth edition xv
Preface to the third edition xvii
Preface to the second edition xix
Preface to the first edition xxi
Acknowledgements xxiii
3. Botanical aspects
3.1 Taxonomy 206
3.2 Plant reproductive morphology 208
3.3 Caryopsis initiation and growth 224
vii
viii Contents
6. Dry-milling technology
6.1 Introduction 423
6.2 Milling processes 424
6.3 Processes in which the main process is decortication 427
6.4 Dry milling in which the main process is roller milling 453
References510
Further reading 513
8. Bread-baking technology
8.1 Principles of baking 567
8.2 Commercial processes for making white bread 588
8.3 Other kinds of breads 603
8.4 Bread staling and preservation 605
8.5 Use of cereals other than wheat in bread 608
8.6 Bread quality 616
8.7 Bread machines for home use 617
References619
Further reading 621
9. Breakfast cereals
9.1 Introduction 624
9.2 Cooking of cereals 624
9.3 Hot cereals 625
9.4 Ready-to-eat cereals 629
9.5 Flaked products from maize 630
9.6 Flaked products from wheat and rice 632
9.7 Puffed products 633
9.8 Shredded products 638
9.9 Granular products 639
9.10 Sugar-coated products 640
9.11 Keeping quality of breakfast cereals 640
9.12 Nutritive value of breakfast cereals 641
9.13 Consumption of breakfast cereals 651
References653
Further reading 654
15. Conclusions
References868
Biography
Norman L. Kent
xi
xii Biography
Celia Kent
Preface to the
fifth edition
With the publication of the first edition of this book in 1966, Dr. Norman
Kent initiated what would become a classic text in the cereal grains litera-
ture. His intent was to provide a comprehensive introduction to all major
aspects of cereal grains, their production and their processing, with the
express intent to educate students. Since that time, the industry has seen
many changes and new technologies. Even so, on a fundamental level, cereal
grains, their chemistries and their processing operations, have changed
only a little over the decades. The fourth edition was published in 1994, and
while that version of the book has been a useful text for many students over
the years, an updated version is necessary for a new generation of students.
During a beautiful April day a few years back we met with Celia Kent,
daughter of the late Norman Kent, in the Royal Horticultural Society’s
garden at Wisley in Surrey, England, to discuss this undertaking and to
plan a new edition of this work.
The new version of this classic book has been thoroughly updated and
revised throughout, both in terms of trends and statistics and also process-
ing operations. We have also rearranged some of the topics for what we
hope is a better flow. It should serve as a timely and expansive resource that
will be useful for students, researchers and industrial practitioners alike,
covering the full spectrum of cereal grain production, chemistry, processing
and uses in foods, feeds, fuels, industrial materials and other applications.
xiii
xiv Preface to the fifth edition
xv
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Preface to the
third edition
The general plan of the third edition of this textbook, intended for the
use of students of food science and of agriculture, closely follows that of
the previous edition.
An attempt has been made to show the importance of the various cere-
als and cereal products as staple items in the diet, relating their nutri-
tive value to their chemical composition. The structure of cereal grains
is described in order to provide a basis for understanding their process-
ing, and consideration is given to the effects of processing on the nutritive
value of the processed products.
By-products and their uses are also mentioned, and reference is made
to relevant food legislation and standards. At the time of writing, new
regulations to replace the (UK) Bread and Flour Regulation 1963 are still
awaited.
The sections dealing with sorghum and the millets have been further
expanded, with the introduction of some information about the domestic
processing of these cereals. A new section on wet milling processes to pro-
duce gluten and starch from wheat or wheat flour is included in Chapter 7.
The valued assistance I have received from many of my erstwhile
colleagues at the Flour Milling and Baking Research Association is
gratefully acknowledged. My particular thanks are due to Mrs. Connie
French, Librarian, who went to considerable trouble in searching out
information; to Dr. Norman Chamberlain, whose crisp comments on
Chapter 10 were most valuable; and to Mr. Brian Stewart, who provided
hitherto unpublished data from which Fig. 32 was constructed.
I would like to thank the firms who most generously provided the data
for Tables 59 and 60; the firms who have willingly supplied pictures; and
the editors of journals, other individuals and publishers who have kindly
allowed me to reproduce pictures and data from their publications.
The picture of ergotized rye (Fig. 39) is Crown Copyright and is repro-
duced with the permission of the Controller of Her Majesty’s Stationery
Office. The Controller of H.M.S.O. has also kindly given permission for
data from Crown Copyright publications to be quoted.
xvii
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Preface to the
second edition
xix
This page intentionally left blank
Preface to the
first edition
xxi
This page intentionally left blank
Acknowledgements
xxiii
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C H A P T E R
1
Introduction to cereals and
pseudocereals and their
production
O U T L I N E
1.2.8 Rye 64
1.2.8.1 Origin and types 64
1.2.8.2 Cultivation 64
1.2.8.3 Diseases and pests 64
1.2.8.4 Uses 65
1.2.8.5 Global production 65
1.2.9 Triticale 66
1.2.9.1 Origin and types 66
1.2.9.2 Cultivation 66
1.2.9.3 Diseases and pests 67
1.2.9.4 Uses 67
1.2.9.5 Global production 67
1.3 Pseudocereals 68
1.3.1 Buckwheat 69
1.3.1.1 Origin and types 69
1.3.1.2 Uses 69
1.3.1.3 Global production 69
1.3.2 Quinoa 70
1.3.2.1 Origin and types 70
1.3.2.2 Uses 71
1.3.2.3 Global production 71
1.3.3 Grain amaranth 72
1.3.3.1 Origin and types 72
1.3.3.2 Uses 73
1.3.3.3 Global production 73
References 74
Further Reading 75
Cereals are cultivated grasses that grow throughout the temperate and
tropical regions of the world.
Broad characterization into two categories serves to distinguish most types
of true cereals. Warm-season cereals are produced and consumed in tropi-
cal lowlands year-round and in temperate climates during the frost-free sea-
son. Warm-season cereals vary in their water requirements, for example, the
majority of rice is grown in flooded fields for at least part of its growth period
while sorghum and millets can be grown in arid conditions.
4 1. INTRODUCTION TO CEREALS AND PSEUDOCEREALS
A Street in Cairo.
He has been there before, several times in fact, and even the
recollection of its boisterous associations causes a smile to cross his
face.
“Oh, I’m with you, Wycherley, on condition—ahem—that you allow
me to pay the fee.”
“Pay nothing. I tell you, my dear fellow, I’ve made it the rule of my life
to deadhead everywhere. There’s nothing I haven’t seen in this
street of nations, the great Midway, and all it cost me was a quarter I
paid to watch a Hindoo juggler do some very clever tricks, and I’m
laying my plans to turn the tables on him. Watch me hoodoo this
door-keeper now.”
With which he steps up. The dark-skinned boy holds out his hand.
Then the vagabond actor proceeds to make a variety of gestures,
such as a deaf and dumb wretch, unacquainted with the mute
alphabet of his fellows, might undertake. Aleck is utterly in the dark
as to their meaning, or whether they have any, but is amazed to see
their influence on the boy. At first he looks disgusted, then grins, and
finally throws up his hands in token of surrender.
“Come,” says Wycherley, and they enter.
“I say, what in the deuce does all that mean?” demands the mystified
Canadian.
“Oh, my boy! I dare not explain. It is soul language. I have been
initiated into the Order of Nomads. I’ve eaten salt with them. That is
as far as I can go. There are the camels. Now to chase the blue
devils away. Nobody can stand here five minutes and fail to laugh.”
And Wycherley is quite right. The uncouth figures of the hump-
backed animals, so strange to Western eyes, their meek, docile
aspect, the ridiculous manner of their rising and squatting are
enough in themselves to arouse interest. Add to this the alarmed
shrieks of the daring women who brave the merriment of the crowd
and venture to take a ride, the clattering of donkeys with pilgrims
astride of them whose legs almost touch the ground, the shouting of
donkey boys and camel drivers, and one can have a faint idea of the
sounds of old Cairo Street.
Several times during the day and evening the wedding procession
takes place; an unique affair, headed by the stout major-domo, with
whirling sword and fierce expression, who is followed by the
strangest rabble American eyes ever gazed upon, from the
palanquin to the dancing girls in the rear, their faces half concealed
behind the yashmak.
Looking down the singular street from a second story balcony, or an
upper chamber of the Mohammedan mosque, as this procession
approaches, one could easily imagine himself in the old native
quarter of Cairo on the Nile. Aleck speedily forgets his troublesome
thoughts in laughing at the ridiculous sights presented on all sides.
Cairo Street was better than a doctor. No one came out regretting
having entered. There you saw only the jolly side of life, for everyone
laughed and joked. While walking along it was nothing to have a
camel poke his nose over one’s shoulder, or be brushed aside by a
donkey boy on the run, shouting, “Look out for Mary Anderson!” or
“Make way for Lily Langtry!”
“Will you have your fortune told?” asks Wycherley, as, mounting the
steps of the mosque, they look through a grated window into a dimly
lighted room where a black Nubian, with a rather repulsive face,
dressed after the manner of his race, squats upon a rug and
manipulates some sand upon the floor, spreading it out deftly, tracing
certain mystic symbols, and finally in rapid Arabic delivering his
prophecy to the smiling interpreter who translates it in the ear of the
mulcted victim, after which “Next,” and another hard-earned
American quarter has started to roll toward the Nile. This fakir
appears to do a flourishing business—Americans have come to the
Fair to be taken in, and anything connected with the Orient has a
peculiar charm for their Western eyes.
At the question Craig laughs:
“What! have you a pull with this wonderful seer in the turban, this
ebony prophet from the land of the lotus?”
“Well, I’ve been there. If I’d had the capital I might have been his
manager. That’s the way it goes—an opportunity of making myself
solid for life lost because I lacked a few dollars,” and Wycherley
chuckles even while he speaks in such a dismal strain.
“This fellow isn’t the only fortune teller at the Fair,” the Canadian
says.
“By no means. I know of several others right here in the street of
Cairo.”
“Yes; I remember one at the lower end—a woman, I believe. I have
seen no other.”
“Walk with me. There is one here—they call her the Veiled Fortune
Teller of Cairo Street. I don’t know that her predictions are any
nearer the truth than the black’s, but somehow the air of mystery
surrounding her excites a certain amount of curiosity.”
“I would like to see her. I thought I had exhausted the sights of this
street, from the odd barber shop where they lay one down on a
bench to shave him, to the shoe store where their stock in trade is
yellow and red baboushas or slippers. If there is a veiled mystery
here I must see her. You said a woman?”
“Yes, and if one can judge of the faint glimpses seen through the
flimsy veil, and by the shapely figure, a beautiful woman, too. Let’s
see the time—yes, this is her last hour for receiving to-day. Come
along, Aleck, my boy.”
The jovial vagabond almost drags him along, and presently they
bring up in front of a stuccoed building. Over a doorway is a sign, so
small Aleck does not wonder he missed it, bearing this scroll:
“It was not until about July 1 that the denizens of the merry Midway
got their houses and shops in order, and settled down to business.
They easily made up for lost time, however, and during the four
bright happy months that followed, the famous street was far and
away the principal popular attraction of the Fair. Those who went to
spend the whole day at the Exposition, equipped with lunch, camp
chair, and guidebook, usually turned up in the Plaisance about every
two hours. Others who made briefer visits to the park either began or
ended them in the same attractive quarter. School teachers, who
made out their programme for the educational features in the Liberal
Arts building, generally landed in Cairo Street. Students of sculpture
who went with the best intentions of studying the marble models in
the Art Palace, ended by studying living models in the Moorish
Palace. Ministers who hoped to prepare themselves for missionary
work, were easily persuaded that they would be best equipped by
looking over the Dahomeyans and South Sea Islanders. And as to
young America—well, the day for him was not done till he had
tossed off half a dozen or more bumpers of beer in Old Vienna.
“All this is now a memory. The places that knew these merry parties
shall know them no more forever. The Samoan now sits serenely
under his island palm; the Bedouin is again astride his steed, and
with shaded eyes looks off across the desert; the Egyptian 'neath the
shadow of the mighty pyramids, recounts the marvels of his half year
in the New World; and the sad-eyed Cingalese woman tells her
sisters in 'the gorgeous East’ about the wondrous West; while the
American, whose energy and genius reared it all, now sees those
sights through a darkened glass, and faintly hears the once familiar
sounds, muffled and indistinct, as of a distant troop of boys at play.
He goes plodding on in paths of busy commerce, farther and farther
along, till time and distance intervene, and Midway sights grow
dimmer still, and Midway sounds sink to a whisper.”
These then are the feelings that cause the Thespian such sorrow. He
hates to think that before snow flies this gay scene will have
vanished as a dream, never to be seen again.
“Cheer up, my dear fellow,” says Aleck, “there will be other fairs as
great as this.”
“But never again a Midway. However, let us throw dull care to the
winds. It ill becomes us to mourn, we who are butterflies of the hour.
What would you now, my lord?”
Wycherley smiles again—the passing of his grief has been very
rapid—for his nature is buoyant.
“I have no plans. We can move around until it is time to go. I am
impressing this scene on my mind so that at any future day I may
reproduce it by simply closing my eyes. When before now, on
American soil, could you see such groups as that sauntering along?”
nodding in the direction of a squad of Algerians and Moors walking
past, clad in the turban and caftan, burnoose and colored robes of
their class, with the inevitable heavy slippers on their feet.
Close behind come a trio of Celestials chattering like parrots, while in
sight at the same time are one or more natives of India, Dahomey,
and Lapland, representing the antipodes. It is the bringing together
of people who live at the frozen north, and those from the burning
equator; the exposition of their home life, their peculiar habits, their
war customs, and marriage ceremonies, that lends such a charm to
a gathering like this. Contrast it by a visit to the Liberal Arts building
and see what civilization does for the human family, what wonderful
treasures are within the grasp of everyone who lives to-day in an
enlightened community.
Just as the squad of Moors and Algerians move past in their
sauntering way, Wycherley is heard to utter an exclamation.
“Who would have believed it?” he says.
“What now?” asks Aleck, wondering if his companion is dreaming of
the fortune he is to win or lose on the morrow.
“She is a flirt, I do believe,” continues the actor.
“Oh, it’s the dark-eyed Spanish senorita who worries the boy. Never
mind; remember there’s as good fish in the sea as ever were
caught.”
“You’re a Job’s comforter, Aleck. Under the circumstances,
physician, heal thyself,” retorts the other.