Explain starch gelatinization, Biology

Assignment Help:

Starch gelatinization

Undamaged starch granules are insoluble in cold water but can imbibe water  reversibly i.e. they can swell slightly and then return to their original size on drying, when starch is heated with excess of water, the molecular order of the granule is gradually and irreversibly destroyed at the gelatinisation temperature, which is approximately in the  range of 60-70°C for most of the starches. Amylose is preferentially leached out of the network and gets solubilized, however, some leaching of amylose can also occur prior to gelatinization. When further heated, starch granules are disrupted and partial solubilization is achieved. Total gelatinization usually occurs over a temperature range with larger granules generally gelatinizing first. At temperatures below 100° C, true molecular solution is not achieved and the swollen hydrated granules consisting of mainly amylopectin remain.  Continued heating of starch granules in excess water results in further granule swelling, additional leaching of soluble components (primarily amylose) and eventually, total disruption of granules especially with the application of shear forces,. This phenomenon results in the formation of a starch paste. The melting temperature of the crystallites is 190°C. Gelatinization is an endothermic process (10 mJ/mg), i.e. a chemical reaction accompanied by the absorption of heat.   

 


Related Discussions:- Explain starch gelatinization

Explain nutritional support management for radiation therapy, Explain Nutri...

Explain Nutritional Support Management for radiation therapy? For managing these patients on radiation therapy, the following measures can be under taken: 1. Administration

DNA copying, why DNA copying is essential

why DNA copying is essential

Define the parts of specific immune or defense mechanisms, The specific imm...

The specific immune (defense mechanisms) response can be broadly classified into two types: a)  Cell mediated immune response: This  is achieved through large number of acti

What is passive transport , The passive transport of molecules across a me...

The passive transport of molecules across a membrane does not require an input of metabolic energy. Rate of the diffusion or transport is proportional to the concentration gradient

Digestive system, which enzymes are required for digestion in cockroach?

which enzymes are required for digestion in cockroach?

Digestive system - liver, LIVE R (HEPAR) - Largest gland of body. W...

LIVE R (HEPAR) - Largest gland of body. Weighing 1.6 kg. Form 1/40 of the body weight. Bio-chemical laboratory. Bussiest part in whole river of life. Dark reddish brown

Which protein component include organic matter of skin, This main protein c...

This main protein component of connective tissue in mammals includes most of the organic matter of skin, bones, tendons, and teeth and occurs as fibrous inclusions in most other bo

Is rabies caused by virus or by bacteria?, Q. Is rabies caused by virus or ...

Q. Is rabies caused by virus or by bacteria? How is it transmitted? Which organs and tissues are affected by the disease? How is it prevented and treated? The Rabies, as well k

Is fecundation in mammals external or internal, Q. Is fecundation in mammal...

Q. Is fecundation in mammals external or internal? Fecundation in mammals is internal with copulation. In the contemporary world human technology is able to promote artificial

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd