water activity
- 최초 등록일
- 2006.11.07
- 최종 저작일
- 2006.01
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MS 파워포인트
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소개글
water activity에 관한 ppt이며 설명은 영문으로 간단히 덧붙였습니다
목차
Moisture in food
Existence of Moisture
Free water and bound water
Water activity
Moisture sorption isotherms
BET adsorption theory
Moisture sorption hysteresis
Bet equation
본문내용
Existence of Moisture
Free liquid
(substance dissolved or dispersed)
-as dispersed phase in some emulsified products
(eg. Butter, magarin)
Hydrates
(eg. starch)
Imbibed water in gel
Absorption on surface of solids
For example some water in food dissolves in material of food some water in food exist in form of emulsification. (eg, butter, magarin)
Besides the existing form mentioned above, water is absorpted in surface of solids.
Free water and bound water
1. Act as solvent
(salt, sugar, soluble protein)
2. High melting point, boiling point, specific heat
3. Strong surface tension
4. High viscosity
참고 자료
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