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.

Science Behind A Pretzel — Quail Hollow Kitchens (3)

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.

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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

What is the science behind making pretzels? ›

An alkaline bath is what makes a pretzel a pretzel and not just a tanned twist of dough. The base reacts with proteins, sugars, and starches at the pretzel's surface to intensify browning and give the skin its tight, glossy sheen. It also imparts that saline, mineral flavor.

What is the story behind the pretzel shape? ›

The legend of the 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 a pretzel supposed to represent in Germany? ›

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.

Is baking pretzels a chemical change? ›

Have students recall that baking powder, the chemical leavener used in the Whole Wheat Soda Bread, produces CO2 to make bread rise. Explain that for the Soft Pretzels we will use a biological leavener, yeast, to create the chemical reaction that will make our pretzels rise.

What is the secret ingredient which makes a pretzel taste like a pretzel? ›

But it's the distinctive "pretzel" flavor that makes this bread extraordinary. That comes from dipping the shaped dough in an alkaline solution — traditionally a small amount of food-grade lye dissolved in water — before baking.

What chemical is used in making pretzels? ›

Lye—also known as sodium hydroxide—is an alkaline compound often used to make household cleaners, soap and detergents. It's also used to provide authentic Bavarian-style pretzels with that golden color, rich flavor and sheen.

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 are some fun facts about pretzels? ›

Fitting with its origin, the name pretzel comes from the word “pretiola” or “l*ttle rewards.” The Baker's Guild used the pretzel as its symbol in the late 12th century. Baking the perfect pretzel was necessary to become a master. Pretzels were a part of wedding ceremonies in the 16th century.

Are pretzels a healthy snack? ›

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 theory of the pretzel? ›

One popular story is that pretzels were invented around 610 A.D. by a baker–monk who wanted to find a use for leftover scraps of dough. He twisted a length of dough and formed the pretzel's iconic shape, which was meant to resemble crossed arms. The pretzel's three holes are said to represent the Holy Trinity.

What was the pretzel a pagan symbol for? ›

He named his creation “pretiola,” Latin for “l*ttle reward.” The three holes represented the Holy Trinity. In the centuries following, the pretzel made its way into history books and European culture. By 1440 the pretzel's form was a symbol of good luck, long life and prosperity.

What does pretzel stand for in English? ›

pret·​zel ˈpret-səl. : a brown cracker that is salted and usually hard and shaped like a loose knot. Etymology. from German Brezel "pretzel," derived from Latin brachiatus (adjective) "having branches like arms," from brachium, "arm" — related to brace entry 2. Word Origin.

Are pretzels acidic or alkaline? ›

Pretzels are one of the very few foods made with an alkaline pH. The pretzel's distinctive brown crust, flavor, and aroma are due to dipping them in a baking soda or lye solution before baking.

Why do you put pretzels in boiling water? ›

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. It also gives them their unique and indelible “pretzel” flavor.

Why are pretzels soaked in lye? ›

When making pretzels, a simple dough is shaped into the traditional pretzel knot and dipped in lye (NaOH, sodium hydroxide) before sprinkling it with salt and baking. This lye dunking is what really makes a pretzel a pretzel and gives it that special flavor so many of us love.

What is the lie for making 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. This method can also be used with rolls or buns. Once lye-dipped pretzels are baked, they're totally safe (and delicious!) to eat.

What is the Maillard reaction in pretzels? ›

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.

What is the production process of pretzels? ›

How We Make Them
  1. 1The dough is mixed then taken onto a cart to the rolling table.
  2. 2The dough is kneaded and cut.
  3. 3The dough is rolled into log-shaped pieces.
  4. 4The dough logs are run through a cutter which scores the dough into individual pieces.

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