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Legumes

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Submitted By ocmrgg
Words 480
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Prepared by Sofia for teknologi pengolahan nabati

• cereals

Wheat

Rice

Maize

Barley

Sorghum

Oat

• Pseudo cereals

Buckwheat

Quinoa

Amaranth

Characteristics of
Cereals
- Grain structure
- Chemical composition
- Physical characters

• Pericarp
- 5% of kernel
- 6% protein, 2% ash, 20% cellulose, 0.5% fat and the remain is NSP

• Seed coat; contains pigment
• Endosperm (83%): aleuron layer and starchy endosperm

• Germ (2.5-3.5%): protein (25%), sugar (18%), oil (16%) and ash

Cell wall and endosperm of wheat
Hard wheat cell wall soft wheat cell wall

Hard wheat endosperm soft wheat endosperm Rice grain structure

• The husk (palea lemma)= 20 %
(16-28%) of rough rice weight
• The brown rice contains
 pericarp 1 to 2 %,
 Aleurone and seed-coat 4 to
6 %,
 germ 1 %,
 scutellum 2 %
 and endosperm 90 to 91 %
(Juliano, 1972)

• More nutritious than white
(milled) rice
• Cooking time is longer than white rice

Rice husk and starch granules
Surface of rice husk

Starch granules and protein bodies near aleurone layer

Starch granules in the center • 4 main parts: bran/hull
(pericarp, epidermis and seed coat), germ, endosperm and tip cap
• Varied kernel color: yellow, white, red, blue, dark brown, purple
• Hull = 5-6% and coated with a layer of wax
• Germ = large, 10-14%
• Endosperm has translucent
(near aleurone) and opaque part ( near center)

Corn Endosperm

Opaque part of endosperm

Hard part of endosperm

Grain structure shape: spherical, weight: 20-30mg, color: bronze, white, red, yellow, or brown pericarp + seed coat: 7.9%, germ: 9.8%, endosperm: 82.3%
KETERANGAN
A : GERM
B : FLOURY
C : FLINTY
D : PERICARP
E : TESTA

Parts of sorghum grain

Outer edge of kernel with testa layer

Vitreous part of endosperm

• Hull 25% of the total weight
• The caryopsis = ‘groat’
• Appearance of groat is similar to wheat kernel but it’s covered by trichomes
• Have higher fat and protein contents than other cereals
• Good source of enzymes;
• lipase is very active, need to be denatured, otherwise milled products have a very short shelf life caused by fatty acids oxidation

Composition

Storage of cereals
• Grains generally are harvested one (or twice) / year, but consumed through the year  must be stored

• Grains have low moisture content  can keep for several years (even decades under ideal-low temperature, inert atmosphere- storage condition)

• Basic types of storage:
a. Simple methods; piled the grain on the ground, bagged grain stored in shelter b. Bulk storage in bins (silo; constructed of steel/concrete) size few to thousands ton

Moisture/Aw management for safe storage
• moisture content determines economic value and quality stability of grain during






storage
Different cereals have different max. moisture level for safe storage
12-13% for rice
13 % for barley, maize, oats and sorghum
14 % for wheat
Above the max. level of water, fungal growth begins
Fungal growth is the most damaging factors in grain storage, and Aw controls the fungal growth
Generally molds do not grow at equilibrium RH

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