Science Behind A Pretzel — Quail Hollow Kitchens (2024)

Quail Hollow Kitchens

Science Behind A Pretzel — Quail Hollow Kitchens (2)

In this blog we will review a recipe and discuss some of the science behind its development. This blog is intended to provided the reader with some insight into what the author of the recipe may have been knowledgeable of during its development. All recipes reviewed are fully published and the author has been noted. There is no intent to discuss the worthiness nor provide any rating of satisfaction of the recipe. We are only reviewing some of the key scientific features that the reader may find interesting.

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Organic chemistry and biochemistry will never, by themselves, enable us to create a recipe. They can however, help us understand why successful recipes work, and in so doing, help us create new ones that are even better.

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I love pretzels, and this just might be your next home baking experiment. Next time you make pretzels (or bagels) try a few of these treatments to see which you prefer for your time and effort (1) make a lye water bath and float your pretzel for about a minute a side.Not into lye?Me neither. Try (2) making a baking soda water bath, and, easiest yet, (3) do what King Arthur Flour does and dissolve non-diastatic malt powder (a derivative of roasted barley)in the water, brush the pretzels with the solution, sprinkle with your topping (if used), then bake.

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Yes, I am a long ago organic chemist and I did work in Material Sciences at the "LM Palo Alto Research Laboratories", but we always used safety protection. In the laboratory I wore close-toed shoes, a lab-coat, gloves, safety glasses and we had a fume hood. In this post we are reviewing some of the science in the recipe Sourdough Pretzels,published by King Arthur Flour. We are not actually reviewing the pretzel recipe itself but rather the techniques behind the pretzel bath.

Let's break down what's happening on the pretzel's surface for each of these treatments. In my beginning baking years I was a little intimidated with the practice of floating a pretzel or bagel in my kitchen in a lye solution. Many years ago, pretzel manufactures figured out that if you bathe a pretzel in lye and water you modify the surface chemistry and a beautiful brown pretzel would develop. These are the same soft warm pretzels you buy at the ball park.

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When I started to study the science in food I too had been unaware that flour is acidic. Yes, that means it has a pH less than neutral water (7.0) somewhere between 6.0 and 6.8,which varies from manufacturer to manufacturer.Due to the natural acidity of flour it limits a very special set of chemical reactions important to the browning of baked goods.

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These chemical reactions are called the Maillard reactions and professional bakers are trained to work with them. Maillard reaction occurs between amino acids (or a free amino group of an amino acid that is part of a protein chain) and reducing sugars(a sugar which donates electrons in the chemical reaction). Some examples of reducing sugars are glucose, fructose, lactose, and maltose (sucrose, or common table sugar is not a reducing sugar).

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Reducing sugars readily interact with amino group and give rise to the Maillard reaction products, which lead to progressive browning and aroma formation. This reaction is also called non-enzymic browning to differentiate it from the often rapid, enzyme-catalyzed browning commonly observed in fresh fruits and vegetables, such as apples and potatoes. Maillard browning products are found where reducing sugars and amino acids, proteins, and/or other nitrogen-containing compounds are heated together, such as in soy sauce, bread crusts, even contributors to the flavor of milk chocolate.Other examples include, the color and aroma of your favorite dark beer, some of your favorite baked goods, and your grilled burger are, at least in part, due to this reaction.[1],[2]

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OK, we got through the chemistry lesson, so let's move on. Here is the important part:the Maillard reaction,is accelerated in an alkaline environment.The lye, as well as the baking soda, increases the alkalinity of the surface of the pretzel and allows for a browning reaction between amino group and reducing sugars to occur. So now you know why we float pretzels and bagels in an alkali solution like lye or baking soda.

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What about the non-diastatic malt powder used in this recipe?So, what is this malt powder? Here's what it's not:diastatic malt.Diastatic malt powder, in addition to the coloring and flavoring effects,also affects the developing chemistry of dough.Diastatic malt contains active enzymes. So, what about non-diastatic malt powder? Non-diastatic malt powder has no active enzymes and is used for flavor just like molasses.In this case, it is the sugars that caramelize. Caramelization may sometimes cause browningin the same foods in which the Maillard reaction occurs, but the two processes are distinct. They both are promoted by heating, but the Maillard reaction involves amino acids, as discussed above, whereas caramelization is the heating of carbohydrate, in particular sucrose, and a reducing sugar without nitrogen-containing compounds (meaning no protein is needed) facilitated with a small amount of acid (as found in the flour)and certain salts.[1],[2]

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So....We looked at a few possible Pretzel bath treatments, and the chemistry behind them..These included: (1) make a lye water bath, (2) make a baking soda water bath, or (3) dissolve non-diastatic malt powder in the water and brush the pretzels.So, what is the best treatment? King Arthur Flour did not use a water-bath treated with lye. Why not? We would have to assume that because lye is caustic and requires the user to wear gloves and have sufficient ventilation, it is understandable that, King Arthur Flour would not have used this method. On the other hand, a baking soda solution is an alternative which many bakers might try. Only you can decide which produces the best pretzel flavor and texture,Maillard reaction or caramelization,and this might spark your next home baking experiment.

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References for this post:

1. Fennema,O. R. (1996).Food Chemistry Third Edition(N.Y. Marcel Dekker), pp. 171-173.

2. Feeney, R.E., and J.R. Whitaker (1982). The Maillard reaction and its preservation. In Food Protein Deterioration, Mechanisms and Functionality (J.P.Cerry,ed.), ACS Symposium Series 206, ACS Washington, DC, pp. 201-229

recipe, review, science

Patricia Davis

salt, lye, pretzel, maillard browning, sourdough pretzel, non-diastatic malt

Science Behind A Pretzel — Quail Hollow Kitchens (2024)

FAQs

Science Behind A Pretzel — Quail Hollow Kitchens? ›

Here is the important part: the Maillard reaction

Maillard reaction
The Maillard reaction (/maɪˈjɑːr/ my-YAR; French: [majaʁ]) is a chemical reaction between amino acids and reducing sugars to create melanoidins, the compounds which give browned food its distinctive flavor.
https://en.wikipedia.org › wiki › Maillard_reaction
, is accelerated in an alkaline environment. The lye, as well as the baking soda, increases the alkalinity of the surface of the pretzel and allows for a browning reaction between amino group and reducing sugars to occur.

What is the science behind the pretzel? ›

In the case of the pretzel, the Maillard reaction is responsible for the deep brown crust, crunchy arms and distinctive taste. At its most basic, the Maillard process is a heat-activated reaction between small sugars and amino acids.

How did they come up with the shape of a pretzel? ›

The Catholic Church claims that a monk in Northern Italy created pretzels by using left-over dough that was originally made for Lent. He created the signature pretzel shape because it was meant to symbolize a child praying with his arms folded across his chest.

What is the Maillard reaction in pretzels? ›

If all the ingredients are the same as traditional white bread, what gives pretzels their unique color and flavor? The answer, simply stated, is a chemical process called the maillard reaction. Pretzel dough is made quite similarly to regular bread dough, using water, flour, yeast, sugar, butter, and salt.

What is a pretzel supposed to represent in Germany? ›

Whatever they may have been called, the popularity of these twisty treats spread across Europe during the Middle Ages. Seen as a symbol of good luck, prosperity and spiritual fulfillment, pretzels were also commonly distributed to the poor, as a way of providing them with both spiritual and literal sustenance.

What makes a pretzel taste like a pretzel? ›

On the one hand, lye gives pretzels their distinctive flavor, kind of a sharp flatness, if that makes sense. It's what keeps a pretzel from tasting like pretzel-shaped bread.

What is the spiritual meaning of the pretzel? ›

They came to be seen as a symbol of good luck, prosperity, and spiritual fulfillment. The three holes in the traditional pretzel shape have also taken on religious meaning over the years. These are sometimes seen as being representative of the Holy Trinity: the Father, the Son, and the Holy Spirit.

What is the difference between a bavarian pretzel and a regular pretzel? ›

Unlike their American counterpart, Bavarian pretzels pack a denser, chewier inside and a darker, crispier outside. And there's a certain "tang" to the Bavarian-style pretzel that sets it apart from other soft pretzels. But best of all, it doesn't need to be dipped in cheese or drenched in butter to taste delicious!

What are some fun facts about pretzels? ›

Here are some fun facts about pretzels:

The pretzel is long considered a good-luck symbol due to its religious roots. Pretzels without salt are called baldies. More than $550 million worth of pretzels are sold in the United States annually. The average American consumes up to two pounds of pretzels in a year.

Why do pretzels have three holes? ›

The pretzel was invented by European monks in the early Middle Ages, possibly in the 6th or 7th century. The monks used the pretzel's distinctive knot shape to represent the Holy Trinity, with the three holes in the pretzel symbolizing the Father, the Son, and the Holy Spirit.

Why are pretzels soaked in lye? ›

Dipping the dough in a lye solution gives traditional German pretzels their characteristic salinity; chew; and smooth mahogany exterior, but the strong alkali (sodium hydroxide) is corrosive and can burn your skin, so it must be handled with caution.

What chemical is used in pretzels? ›

Lye is primarily used to make pretzels, and it's the reason for their unmistakable shiny, mahogany color. To prepare, shaped pretzels are dipped in a lye bath, then baked in the oven.

What is the function of milk in pretzel formation? ›

Milk- This is warmed so it makes a hospitable environment for the yeast to froth. Whole milk or 2% works best for a richer dough, but even skim milk can be used. Brown sugar- This is both to sweeten the pretzel dough and to feed the yeast so it will froth and rise.

What's the difference between a bretzel and a pretzel? ›

Bretzel is the German word for what we know as pretzel. When creating his own pretzel company in 1911, Adolph Benzel gave his central Pennsylvania bakery the name of Benzel's Bretzel Bakery. A hundred years later, the name on the door of the family-owned business remains the same.

What is the legend of the pretzel? ›

An Italian monk teaching children in Northern Italy is said to have invented soft little pretzels and called them pretiola or little rewards, to reward children for learning their prayers. He is said to have made the treats with little arms forming the 'knot', to resemble little arms crossed of children in prayer.

Are pretzels healthy? ›

Pretzels may be better than some fatty chips, but four out of five nutrition experts surveyed by Time say if you're trying to eat healthy, pretzels shouldn't be your go-to snack. Although pretzels are low-fat, they are also pretty paltry on the protein and fiber front, and they can be quite high in sodium and carbs.

What is the meaning behind the pretzel? ›

During the 16th century, pretzels were often given as rewards to children who learned their prayers, further strengthening the connection between pretzels and religious customs. The pretzel's shape was also associated with a range of symbolic meanings, including arms folded in prayer or a child's posture of humility.

What is the story behind the soft pretzel? ›

According to some scholars and various sources, the most popular story is that the pretzel was made in 1610 AD by an Italian monk when he decided to make a special treat to help motivate his students to keep on learning.

What is the religious story of the pretzel? ›

Christian Roots

They believe the pretzel shape represents the holy trinity, the three holes representing the Father, the Son, and the Holy Spirit. Soft pretzels using a simple recipe of only flour, water, and salt were used during Lent when Christians were not permitted to eat eggs, lard, or any dairy products.

How do pretzels work? ›

So what makes a pretzel into a pretzel? The answer lies in a brief dip in an alkaline water bath before baking. This bath essentially gelatinizes the outside of the pretzel, preventing it from fully “springing” during baking (as bread does) and giving pretzels their signature chewy crust.

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