Pregelatinezed Starch ( Gamze ÇELİK )

  • FE-401 FOOD TECHNOLOGY

Gamze ÇELİK

Rafia ÇETİNTAŞ

Rojda DAKAK

Zehra DEMİRCİ

Simge Deveci

Huriye Hazal ERDOĞAN

SUPERVISIOR : PROF.DR.ŞENOL İBANOĞLU

  • STARCH

  • Polysaccharide carbohydrate

  • Consisting of a large number of glucose units

  • Joined together by glycosidic bonds.

  • Consist of amylose and amylopectin

  • Produced by all green plants as an energy store

  • Corn Starch

  • Nutrition value of corn starch

  • Carbohydrate:88.8%

       –Diatary fiber:0.5%

       –Carbohydrate, available:88.3%

  • Fat:0.6%

  • Protein:0.4%

  • Moisture Content:10.2%

  • Energy:1534 kj

MODIFIED STARCH ?

Modified starch is a food additive which is prepared by treating starch causing the starch to be partially degraded.

  • Purpose of modification

  • The purposes of this modification are to enhance its properties particularly in specific applications such as to improve the increase in water holding capacity, heat resistant behavior, reinforce its binding, minimized syneresis of starch and improved thickening

METHODS OF MODIFICATION

  • Hydrolysis

  • Oxidation

  • Cross-linking

  • Pregelatinization

Modified starch has many uses in food products:

  • PREGELATINIZATION

  • Starch gelatinization is a process of breaking down the intermolecular bonds of starch molecules in the presence of water and heat.

  • PROPERTIES OF PREGELATINIZED STARCH

High water binding capacity

High digestibility

High viscosity

Water soluble

Chemically more active

Low crystallinity

WHY DRUM DRYER?

  • Suitable for very viscous food material

  • Quick method

  • Large heating surface

  • Requires small space for operation.

  • Efficient

  • PROCESS LINE DIAGRAM

  • Stirring

  • Stirring process is applied to get dough from starch with addition of 35-40 % water.

  • Starch slurry occur in %40 water and %60 starch.

  • A concentrated aqueous starch slurry, consisting of unmodified raw starch.

  • Process is fed to the roll with dip feed type feeding.

  • Temperature of stirring is 320C

  • Drum dryer

  • It is consist of a drum of about 0.75-1.5 m in diameter and 2-4 m length, heated internally usually by steam and rotated on its horizontal axis.

  • Inlet steam temperature range 180 0C-200 0C.

  • Drum Surface Temperature :120-1700C

  • Drum Rotation Speed :2-6 rpm

  • Collection

Dry products from drum dryer are collected.

These products are sent to the hammer milling.

  • Hammer Milling

    A hammer mill is a mill whose purpose is to shred or crush aggregate material into smaller pieces by the repeated blows of little hammers.

  • PACKAGING

  • EQUIPMENT LIST

  • Steam generator,

  • Rotary drum heater,

  • Steam pressure meter,

  • Water drainage valve,

  • Material distribution pipeline,

  • Flow regulating valves,

  • Discharge scraper,

  • Material collecting hopper.

  • CRITICAL PARAMETERS

  • Water Content

  • Drum Surface Temperature :120-1700C

  • Drum Rotation Speed :2-6 rpm

  • CONTROL POINTS

  • Dust formation

  • Metal detection

  • PROPERTIES OF FINISHED PRODUCT

Physical Properties

  • Appearance : Fine white powder

  • Smell : Neutral

  • Shape: Not uniform, like ellipsoidal

  • Color : White

  • Swelling capacity : increased

  • High water solubility

  • High water absorption

  • Viscosity : increased

  • Size of the starch granules : reduced

  • Moisture content : 8 % max.


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