I C Food science & nutrient composition: grains & baking Flashcards
how is gluten made?*****
from GLIADIN and GLUTENIN through process of HYDRATION + MIXING
what properties does gluten contribute?***
ELASTIC properties, forms framework/holds in leavening
does flour have gluten?***
NO- has gliadin and glutenin, once mixed has gluten
color of flour is due to?
carotenoids- natural agents cause oxidation during storage and turn flour from creamy yellow to white
when is a flour labeled “bleached”?
if an oxidizing agent is added
the strength of the flour refers to?
capacity to retain leavening, depends on quality of the gluten (ex: bread flour is strong, cake flour is weak)
what does adding bran to flour do?
decreases volume of end product; increase flour and liquid to compensate
what do liquids do to gluten?
hydrates it and starts its development
what do liquids do to starch?
gelatinize it
types of leavening agents
steam, air, CO2 (+baking powder)
what does steam do as a leavening agent?
expands hollow shell formed by flour and egg
examples of steam as a leavening agent
popovers, creampuffs
what does air do as a leavening agent?
EXPANDS when heated before proteins coagulate and retain it
how to incorporate air?
beat, sift, fold, cream
example of air as a leavening agent
angel cake, sponge cake
when is carbon dioxide produced as a leavening agent?***
1) yeast on sugar (yields CO2 + alcohol)
2) acid on baking soda
acids used on baking soda are?
sour milk, cream of tartar, molasses
what is baking powder?***
mixture of BAKING SODA (provides CO2) + dry ACID (reacts with soda to release CO2) + cornstarch
baking powder vs baking soda***
ALL baking powders have baking soda!
- baking soda = alkaline
- baking powder = baking soda + acid
properties of old baking powder***
more ALKALINE = LOSS of THIAMIN in baked goods
what does salt do in baking goods?
adds flavor, keeps yeast from sticking
what do eggs do in baking goods?
provides stability, retains leavening agent, distributes shortening by emulsification, introduces air and adds color/flavor
what does fat do in baking goods?
adds TENDERNESS by coating gluten particles
what does hygro mean?
water
relationship of sugar and texture of baked goods**
sugar = HYGROSCOPIC –> modifies texture by TENDERIZING
how does the sugar tenderize the baked goods?***
softens gluten and PREVENTS GLUTEN DEVELOPMENT by ABSORBING H2O that gluten needs to develop
what happens if you use too much sugar in baked goods?**
COARSE CELLS, THICK WALLS, SHINY CRUST, CRUMBLY PRODUCT (d/t weaker gluten)
most of sugar in honey is?
glucose + fructose
when substituting Sweet and Low for sugar in a recipe, what should you do?
use half as much
mixing methods: beat
over and over to smooth and incorporate AIR