a kernel of · pdf filehow flour is milled (a simplified diagram) clear flour germ p a tent...

2
BRAN ENDOSPERM GERM Germ...about 2 1/2 percent of the kernel weight. e germ is the embryo or sprouting section of the seed, often separated from flour in milling because the fat content limits flour’s shelf-life. Whole Grains...whole grain products are made with the whole kernel of grain. e bran (outer layer) contains the largest amount of fiber (insoluble), B vitamins, trace minerals and a small amount of protein; the endosperm (middle layer) contains mostly protein and carbohydrates along with small amounts of B vitamins, iron and soluble fiber; and the germ (inner part) is a rich source of trace minerals, unsaturated fats, B vitamins, antioxidants, phytochemicals and a minimal amount of high quality protein. Enriched Grains...enriched white flour is the finely ground endosperm of the kernel. Some of the nutrients that are milled out are replaced through enrichment. Slice for slice, enriched white bread as well as other enriched grain products, are a good source of iron and or B vitamins (thiamin, riboflavin, niacin and folic acid) as well as complex carbohydrates. Enriched grain products have over twice the amount of folic acid as whole wheat. Compare a slice of enriched white bread with 37mcg to a slice of whole grain bread at 17.5mcg. Longitudinal Section of Grain of Wheat Grain-based Foods...provide complex carbohydrates – the best fuel for our bodies. ese foods are often low in fat and contain fiber. Grain foods provide vitamins – especially the four key B vitamins (thiamin, riboflavin, niacin and folic acid) and iron. During the milling process, white flour is produced by removing the bran and germ portions of the wheat. Most (95%) products made from white flour are enriched. Whole grain foods are made with flour that contains all three parts of the kernel. Nutrition experts recommend that at least half of our daily grains come from whole grain products. e total number needed each day depends on age, gender and activity level. Visit www.choosemyplate.gov/ food-groups/grains-amount.html to determine the appropriate amount of grains needed. a Kernel of Wheat The Kernel of Wheat...sometimes called the wheat berry, the kernel is the seed from which the wheat plant grows. Each tiny seed contains three distinct parts that are separated during the milling process to produce flour. Endosperm...about 83 percent of the kernel weight and the source of white flour. Bran...about 14 1/2 percent of the kernel weight. Bran is included in whole wheat flour and can also be bought separately. Source: USDA/CNPP Wheat Foods Council www.wheatfoods.org Twitter: @WheatFoods Facebook: WheatFoods E-mail us at: [email protected] 970-626-9828

Upload: phungtruc

Post on 08-Feb-2018

220 views

Category:

Documents


0 download

TRANSCRIPT

B R A N

E N D O S P E R M

G E R M

Germ...about 2 1/2 percent of the kernel weight. �e germ is the embryo or sprouting section of the seed, often separated from �our in milling because the fat content limits �our’s shelf-life.

Whole Grains...whole grain products are made with the whole kernel of grain. �e bran (outer layer) contains the largest amount of �ber (insoluble), B vitamins, trace minerals and a small amount of protein; the endosperm (middle layer) contains mostly protein and carbohydrates along with small amounts of B vitamins, iron and soluble �ber; and the germ (inner part) is a rich source of trace minerals, unsaturated fats, B vitamins, antioxidants, phytochemicals and a minimal amount of high quality protein.

Enriched Grains...enriched white �our is the �nely ground endosperm of the kernel. Some of the nutrients that are milled out are replaced through enrichment. Slice for slice, enriched white bread as well as other enriched grain products, are a good source of iron and or B vitamins (thiamin, ribo�avin, niacin and folic acid) as well as complex carbohydrates. Enriched grain products have over twice the amount of folic acid as whole wheat. Compare a slice of enriched white bread with 37mcg to a slice of whole grain bread at 17.5mcg.

Longitudinal Sectionof Grain of Wheat

Grain-based Foods...provide complex carbohydrates – the best fuel for our bodies. �ese foods are often low in fat and contain �ber. Grain foods provide vitamins – especially the four key B vitamins (thiamin, ribo�avin, niacin and folic acid) and iron. During the milling process, white �our is produced by removing the bran and germ portions of the wheat. Most (95%) products made from white �our are enriched. Whole grain foods are made with �our that contains all three parts of the kernel. Nutrition experts recommend that at least half of our daily grains come from whole grain products. �e total number needed each day depends on age, gender and activity level. Visit www.choosemyplate.gov/ food-groups/grains-amount.html to determine the appropriate amount of grains needed.

a Kernel of WheatThe Kernel of Wheat...sometimes called the wheat berry, the kernel is the seed from which the wheat plant grows. Each tiny seed contains three distinct parts that are separated during the milling process to produce �our.

Endosperm...about 83 percent of the kernel weight and the source of white �our.

Bran...about 14 1/2 percent of the kernel weight. Bran is included in whole wheat �our and can also be bought separately.

Source: USDA/CNPP

Wheat Foods Councilwww.wheatfoods.org

Twitter: @WheatFoodsFacebook: WheatFoods

E-mail us at: [email protected]

HO

W F

LOU

R IS

MIL

LED

(A S

IMPL

IFIE

D D

IAG

RAM

)

CLEA

R FL

OU

R

GER

M

PATE

NT

FLO

UR

BLEA

CHIN

G-

�our

ism

atur

edan

d co

lor

neut

raliz

ed

BULK

STO

RAG

E

PURI

FIER

PURI

FIER

GRI

ND

ING

BIN

FIRS

T BR

EAK-

corr

ugat

edro

lls b

reak

whe

at in

toco

arse

par

ticle

s.

SCO

URE

R-be

ater

sin

scr

een

cylin

der

scou

r o�

impu

ritie

san

d ro

ugha

ge.

WA

SHER

-STO

NER

high

spe

ed ro

tors

circ

ulat

e w

heat

and

wat

er-s

tone

s ar

ere

mov

ed.

DIS

C SE

PARA

TOR-

barle

y, o

ats,

cock

lean

d ot

her f

orei

gnm

ater

ials

are

rem

oved

.

ASP

IRAT

OR-

air

curr

ents

rem

ove

light

er im

purit

ies.

SEPA

RATO

R-re

cipr

ocat

ing

scre

ens

rem

ove

ston

es, s

ticks

and

othe

r coa

rse

and

�ne

mat

eria

ls.

MA

GN

ETIC

SEPA

RATO

R-iro

n or

stee

l art

icle

s st

ayhe

re.

TEM

PERI

NG

-wat

erto

ughe

ns o

uter

bra

nco

ats

for e

asie

rse

para

tion-

soft

ens

or m

ello

ws

endo

sper

m.

BLEN

DIN

G-t

ypes

of

whe

at a

re b

lend

ed to

mak

e sp

eci�

c �o

urs.

ENTO

LETE

R-im

pact

mac

hine

br

eaks

and

rem

oves

un

soun

d w

heat

.

PRO

DU

CTCO

NTR

OL-

chem

ists

insp

ect a

nd c

lass

ifyw

heat

, ble

ndin

g is

ofte

n do

ne a

t thi

spo

int.

ELEV

ATO

R-st

orag

ean

d ca

re o

f whe

at.

BARG

E

RAIL

TRU

CK

IT S

TART

S H

ERE…

ENRI

CHIN

G-

thia

min

e,ni

acin

,rib

o�av

inan

d iro

n ar

ead

ded.

SACK

ED-

for h

ome

and

bake

ryus

e.

BULK

DEL

IVER

Yto

bak

erie

s…by tr

uck

by ra

il

A s

erie

s of

pur

i�er

sre

duci

ng ro

lls a

ndsi

fter

s re

peat

the

proc

ess.

RED

UCI

NG

RO

LLS-

smoo

th ro

llsre

duce

mid

dlin

gsin

to �

our.

air c

urre

nts

and

siev

es s

epar

ate

bran

and

clas

sify

par

ticle

s(o

r mid

dlin

gs).

brok

en w

heat

is s

ifted

thro

ugh

succ

essi

vesc

reen

s of

incr

easi

ng�n

enes

s.

in a

ser

ies

of p

uri�

ers,

redu

cing

rolls

and

sift

ers.

NO

TE:

This

cha

rt is

gre

atly

sim

pli�

ed.

The

sequ

ence

, num

ber a

nd c

ompl

exity

of d

i�er

ent o

pera

tions

var

y in

di�

eren

t mill

s.

SHO

RTS

BRA

N

RED

UCI

NG

ROLL

S

PURI

FIER

air

air

air

TEM

PERI

NG

BIN

S

SIFT

ER

SIFT

ER

SIFT

ER

SIFT

ER

Shor

ts

Bran

and

Sho

rts

Flou

r

GER

M R

OLL

S

Flou

r

Flou

r