day 5

Day 5

• Gluten• Dough development• Sweeteners

Words, Phrases, and Concepts

• Glutenin• Gliadin• Tenacity• Elasticity• Extensibility• Windowpane• Bucky dough• Slack dough• Mechanical dough

development

• Chemical dough development

• Water hardness• pH• Letdown stage• Reducing agent• Glutathione• Protease• Dough relaxation

Introduction

Gluten:– One of three main structure builders in baked

goods.• Egg proteins and starch are other two.• Especially important with yeast doughs.

– Affected by formula and method of preparation.

Gluten Formation and Development

Gluten:– Is a large, complex protein.

• Made up of glutenin and gliadin, two proteins in flour.

– Forms a strong, stretchy network when flour is mixed with water.

• Glutenin: provides strength and elasticity.– Strength is also called tenacity; a measure of how much

force is needed to stretch dough.– Elasticity refers to the ability to bounce back once dough

is stretched.• Gliadin: provides extensibility, or stretchiness.


Yeast doughs need a balance of glutenin and gliadin: –Need a balance of strength and stretchiness.


Gluten:– Changes as it is handled.– Dough becomes smoother, stronger, drier,

and less lumpy as gluten develops.


When yeast dough reaches a balance of strength and stretchiness:

– Has reached dough maturity.– Can be stretched into a paper-thin sheet of

dough known as a windowpane.

Determining Gluten Requirements

Baked goods vary in their need for gluten. • Yeast doughs need gluten for fermentation

tolerance:– For the ability of dough to hold in gases generated

from yeast fermentation.– Important throughout proofing and oven spring.

• Provides for large loaf volume and fine crumb.• Ciabatta dough requires less gluten than sandwich bread

(pain de mie).

Measuring Gluten

• Alveograph• Measures elasticity- P• Measures extensibility- L• P/L• W- Energy required to inflate dough

Determining Gluten Requirements

Baked goods vary in their need for gluten. • Cakes and most other pastries need less gluten

than yeast doughs. – Many rely more on other structure builders (eggs and

starch).– However, gluten often needed to prevent crumbling,

collapsing, or slumping.• Examples: pie crust, baking powder biscuits.

Controlling Gluten Development

• Three ways that gluten develops and matures in yeast dough:– Mechanical dough development: mixing.– Chemical dough development: addition of

maturing agents that strengthen.– Bulk fermentation and proofing.

• Complex; many changes besides gluten development occur simultaneously.

• Each acts differently, but all encourage gluten development.


Gluten development: Results from the alignment and bonding of glutenin into a large, cohesive gluten network.


• Many ways to control gluten development:– Know how to increase gluten so that:

• Dough is stronger and more elastic, or• Baked good is firmer and holds it shape.

– Know how to decrease gluten so that:• Dough is softer, slacker, and more extensible, or• Baked good is more tender.

• Not all techniques work in all products:Examples: dough conditioners, heat-treated milk.

Controlling Gluten Development1.Type of flour

– Type of grain.• Wheat, rye, oat, corn, etc.

– Wheat is only grain with significant glutenin and gliadin.– Varieties of wheat.

• Soft, hard, durum.– White vs. whole wheat.

Controlling Gluten Development2.Amount of water

– When gluten is not fully hydrated, additional water increases gluten development.

Examples: pie and biscuit doughs.– When gluten is fully hydrated, additional water

dilutes and decreases gluten development.Examples: cake batter, well-hydrated bread dough.

Controlling Gluten Development3.Water hardness

– Measure of mineral content: calcium and magnesium.

• Hard water is high in minerals; produces strong, bucky dough.

• Soft water is low in minerals; produces soft, slack extensible dough.

– In yeast doughs, usually best to have water that is neither too hard nor too soft, so that strength and extensibility are in balance.

Controlling Gluten DevelopmentWater hardness varies across the country.


4.Water pH– Measure of acidity or

alkalinity.– For maximum gluten:

pH = 5-6 (slightly acidic).

– Adding acid lowers pH.Example: Vinegar makes strudel dough softer, more extensible.

– Adding alkali (base) raises pH.

Example: Baking soda makes cookies thinner, more open, more tender.

Controlling Gluten Development5.Mixing and kneading

– The more mixing, the more gluten development – up to a point.

– Mixing increases gluten development as it:• Speeds up hydration of flour particles.• Adds oxygen from air into dough.• Distributes particles evenly throughout dough.

Controlling Gluten Development5.Mixing and kneading (cont.)

– Lengthy or vigorous mixing breaks down gluten structure.

• Letdown stage of mixing yeast doughs.• Dough becomes soft, sticky, easily torn. • The weaker the gluten, the more easily it overmixes.

Examples: rye dough; rich, sweet yeast doughs.


6.Batter/dough temperature– Warmer the temperature, the faster gluten

develops.• Not a common means of controlling gluten

development.Examples: yeast-raised dough; pie pastry dough


7.Maturing agents and dough conditioners– Maturing agent that weakens gluten: chlorine.– Maturing agent that strengthens: ascorbic acid.– Dough conditioners:

• Multifunctional ingredients.• Primarily, they strengthen gluten.


8.Fermentation and proofing– Expanding air bubbles push on gluten,

strengthening it.– Additional fermentation and proofing can

weaken gluten.• Dough becomes softer and more extensible.

– Overall, complex effect on gluten: many chemical and physical changes happening.


9.Reducing agents– Opposite of maturing agents that strengthen.– Weaken gluten; doughs become softer, more

extensible.– Example: glutathione

• Found in: fluid milk, active dry yeast, wheat germ.

Controlling Gluten Development10.Enzyme activity

– Proteases are enzymes that break down proteins, including gluten.

– Weakens gluten; dough becomes softer, more extensible.

Controlling Gluten Development10.Enzyme activity (cont’)


11.Tenderizers and softeners– Interfere with or limit gluten development.– Examples:

• Fats, oils, and emulsifiers.– Shortening is named for the ability of fats to “shorten”

gluten strands.

• Sugars.• Leavening gases.

– Gluten strands stretch thin as leavening gases expand, weakening cell walls.


12.Salt– Strengthens gluten and makes it less sticky.

• Prevents excessive tearing as gluten stretches. • Salt is sometimes added late in the mixing of yeast

doughs.– Reduces frictional heat from mixing.


13.Other structure builders– Interfere with gluten development, even as

they contribute their own structure.Example: starches, especially if ungelatinized; eggs in rich sweet yeast doughs.

Controlling Gluten Development14.Milk

– Fluid milk:• Source of water; increases gluten development.• Contains glutathione; reduces gluten during

fermentation and proofing.– Dough becomes softer, more extensible.– Scalding milk first inactivates glutathione.

– Dry milk solids (DMS):• Low-heat DMS: contains glutathione; weakens gluten.• High-heat DMA: contains no glutathione; does not

weaken gluten.


15.Fiber, bran, grain particles, fruit pieces, spices, etc. – Weaken gluten by shortening gluten strands.

• Particles physically interfere with gluten strands from forming.


Dough relaxation – Dough resting period.

• Bench rest for yeast doughs.• Refrigeration of laminated doughs between folds.

– Refrigeration also solidifies fat, for more flakiness.

– Makes it easier to shape, roll and fold dough properly.• Dough is less elastic and more extensible.

– Dough shrinks less during baking.

Words, Phrases, and Concepts

• Monosaccharide• Disaccharide• Higher saccharide• Polysaccharide• Sugar crystal• Boiled confections• Hygroscopic• Refiners’ syrup

• Syrup• Inversion• Water activity• Doctoring/interfering

agent

Sweeteners

Many sweeteners available.– Dry sugars.– Syrups.– Specialty sweeteners.

Sweeteners vary in sweetness and other functions.

Successful bakers and pastry chefs:– Know the features of each sweetener. – Know how to substitute one for another.

Sweeteners

Sugars– “Sugar” refers to regular granulated sugar;

sucrose.

– Other sugars: fructose, glucose, maltose, lactose.

• Available as dry sugars but typically purchased in syrup form.

– All sugars are carbohydrates.• Molecules made up of carbon (C), hydrogen (H),

and oxygen (O) atoms.

Sweeteners

Sugars– Some sugars are monosaccharides.

• Contain one (mono) sugar unit (saccharide).

Sweeteners

Sugars– Other sugars are disaccharides.

• Contain two (di) sugar units bonded together.

SweetenersSome carbohydrates, while not sugars, are made of sugars bonded together.

– Oligosaccharides/higher saccharides• About 3-10 sugar units bonded together.• Present in many syrups.

– Polysaccharides• Made of many (poly) sugar units bonded together.

Example: starch

SweetenersSugar crystals:

– Are highly ordered arrangements of sugar molecules bonded together.

– Are pure; for example:• Sucrose molecules bond to form sucrose crystals.• Fructose molecules bond to form fructose crystals.

– Are white, unless molasses or other “impurities” are trapped between crystals.

– Are difficult to form or to grow large when more than one sugar is present.

• One way to minimize crystal growth in confections is to include a mix of different sugars in a formula.

SweetenersSugar crystal growth:

– Is important to control when making boiled confections, made by dissolving sugar in water, then boiling to concentrate.

– Sometimes:• Large crystals are desired.

Example: rock candy.• Small, uniform crystals are desired.

Examples: icings and many crystalline boiled confections, including fondant and fudge.

• No crystals are desired.Examples: noncrystalline boiled confections, including nut

brittle, caramel; also, poured, spun, and pulled sugar.

SweetenersSugars are hygroscopic.

– They attract and bond to water, pulling water from proteins, starches, and gums.

• This thins out batters and doughs.

Sweeteners– Sugars and other carbohydrates vary in their

hygroscopic nature.• Fructose is highly hygroscopic.• Isomalt is not very hygroscopic.

– Hygroscopic nature of sugar and other carbohydrates:

• Is sometimes desirable.examples: soft cookies, icings.

• Is sometime undesirable.examples: powdered sugar on doughnuts; spun or pulled

sugar.

Dry Crystalline SugarsDry crystalline sugars (sucrose) vary in:

– Added ingredients.• Molasses, refiners’ syrup, cornstarch, carnauba

wax.– Particle size.

Dry Crystalline SugarsRegular granulated sugar

– Extracted from sugarcane or sugar beets.– Processing involves two basic steps:

• Milling: extraction of inedible raw sugar from sugarcane or sugar beets.

– Molasses is a by-product.• Refining: removal of impurities from raw sugar.

– Refiners’ syrup is a by-product.– Greater than 99.9 percent pure sucrose.

• Impurities can cause undesirable crystallization and browning in boiled confections; to prevent: add acid.

Dry Crystalline SugarsRegular granulated sugar

– Semi-refined granulated sugar available.• Less refined than regular granulated.• A specialty sweetener; more expensive.• Retains small amount (less than 2 percent) of

refiners’ syrup.– Pale blond or gold in color.

• Functions like regular granulated sugar in baking.• Goes by many names, including first crystallization

sugar, dried cane syrup, unrefined milled sugar, natural cane juice crystals.

• Available as certified organic.

Dry Crystalline Sugars

Coarse sugar– Also called: sanding sugar,

confectioners AA (Con AA).

– Large, glistening crystals.– Often >99.98 percent

pure sucrose; Expensive.– May contain carnauba

wax, for added sheen.– Uses: garnishing baked

goods; also, clear syrups and white boiled confections.

Dry Crystalline SugarsPowdered sugar

– Also called confectioners’ sugar; icing sugar in Canada.

– Made from sugar finely pulverized into powder.– Contains 3 percent added cornstarch, to prevent

caking.• Adds a raw starch taste.

– Available in different degrees of fineness.• The higher the number, the greater the fineness.

Examples: 6X and 10X.– Uses: uncooked icings, decorative dusting on desserts,

stiffened meringues and whipped cream.


Fondant and icing sugars– Smallest grain size of any sugar (< 45 microns).

• Smoothest mouthfeel.

– No added cornstarch.• Special additives or special process prevents caking.• No raw starch taste.

– Uses: uncooked fondant, glazes, cream centers (pralines).

– Examples: Easy Fond and Drifond.


Superfine granulated– Smaller than regular granulated sugar, larger than

powdered sugar.– Also called ultrafine.– Similar in granulation to baker’s, bar, caster, and fruit

sugars.– Uses: cakes (for uniform crumb), cookies (increased spread),

meringue (reduced beading).


Regular (soft) brown sugar– Regular granulated sugar with a small amount (less

than 10 percent) of molasses or refiner’s syrup.• Sometimes contains caramel color, for darker appearance.

– Soft, sticky, tends to clump.– Flavor and color of brown sugar can vary even as the

amount of molasses stays the same.Examples: light brown sugar, dark brown sugar.


Regular (soft) brown sugar (cont.)– Made one of two ways:

• Semi-refined cane sugar dissolved in molasses and recrystallized into brown sugar.

• Cane molasses “painted” onto refined beet sugar.– Uses: For color and flavor; use in place of regular granulated

sugar, pound for pound.– Can substitute about 1 pound (1 kilogram) molasses and 9

pounds (9 kilograms) sugar for every 10 pounds (10 kilograms).


Specialty brown sugars– Muscovado: A soft, moist

brown sugar.• Dark muscovado is dark,

rich, and fruity tasting; high in molasses.

• Light muscovado also available.

Brown sugar. Clockwise from top: regular lightbrown, dark muscovado, Demerara, and Sucanat

Dry Crystalline SugarsSpecialty brown sugars

– Sucanat: Short for SUgar CAne NATural• Free-flowing, unrefined

brown sugar.• Large porous granules,

not crystals.• Made directly by

concentration sugar cane “juice”.



Specialty brown sugars– Turbinado: Large, dry,

free-flowing crystals.• Similar to light brown

sugar in taste and color.• Semi-refined; sometimes

deceptively called raw, washed raw, or unrefined sugar.

– Demerera: Little to no difference from turbinado.


Relative strength of sweeteners• Fructose- 170• Invert sugar/Honey- 140• Sucrose- 100• Glucose- 75• Corn syrup- Medium DE- 50• Isomalt- 50• Maltose- 30• Corn Syrup- Low DE- 15• Lactose- 15

Lab• Each Group:• Gluten ball- pg. 156• Gr 1- Cake• Gr 2- Bread• Gr 3- Whole wheat• Gr 4- High gluten• Compare Sweeteners- Exercise 3, pg.198• Cookies- pg. 111• Work on formula- variation 1

Rolled Cookies

• Gr 1- Use Bread flour• Gr 2- Use Cake flour• Gr 3- Use AP• Gr 4- Use White Whole Wheat

day 5

Documents

gluten formation

gluten development1

ability of dough

gluten developmentmany

gluten developmentthree

cohesive gluten network

ciabatta dough

dough conditioners