Module 7 /Science of cooking / worksheet - Chemistry
The worksheet is attached Food of the gods… Model 1. Chocolate is a product of the cacao bean – a seed found within the fruit of the cacao tree, Theobroma (“food of the gods”) cacao. When removed from the fruit, the cacao bean is astringent, bitter and practically aroma-less. Since it is a seed, it contains the embryo of the cacao tree, as well as protein and fat (cacao butter) to nourish the seedling, and defensive compounds that deter animals from eating the seeds. The defensive compounds include astringent phenolics, anthocyanins, and two bitter alkaloids – theobromine and caffeine. Figure 30.1 (L) Roasted cacao bean cut in half (R) Raw cacao bean cut in half (image licensed under creative commons) The cacao seed is also ~65\% water. Cacao fruit is a pod filled with many cacao beans/seeds embedded in a sugary pulp. When the fruit is mature, the pulp and seeds are removed and fermented. During fermentation the sugary pulp is consumed by yeast and bacteria. The yeast convert sugar (C6H12O6) to ethanol (C2H6O), and the bacteria use oxygen to convert the ethanol (C2H6O) into acetic acid (C2H4O2, the acid in vinegar). glucose ( C 6 H 12 O 6 ) C C C C C O H OH H H OH H OH CH 2 H HO OH yeast H 3 C CH 2 OH + 2 CO 2 2 O 2 H 3 C C OH O acetic acid ethanol O 2 2 bacteria destroys cell membranes of cacao beans Over time, the acetic acid breaks down cell membranes of the cacao seed, and the defensive compounds mix with enzymes and air. Figure 30.2. Fermentation of the cacao fruit pulp converts glucose sugars into acetic acid. As we have seen with browning of fruits and vegetables (Activity 21_Plants and Color), when phenolics mix with enzymes and air, oxidation turns the astringent phenolics into brown colored compounds that are less astringent. When the membranes are weakened by acid, released enzymes also break down the proteins inside the seed/bean into amino acids. After the fermentation, the beans are dried in preparation for roasting. Table 30.1. The Composition of Fermented Dried Cacao Beans Molecule \% by weight Molecule \% by weight Water 5 Sugars 1 Proteins and amino acids 12 Phenolic compounds 6 Cacao butter (fat) 54 Minerals 3 Starch 6 Theobromine (an alkaloid) 1.2 Fiber 11 Caffeine (an alkaloid) 0.2 Roasting uses dry heat to remove much (but not all) of the vinegary acetic acid by evaporation, and generate the browning Maillard reactions between the amino acids and sugars. Finally the heat develops flavor molecules from the Maillard reactions and the breakdown of some defensive compounds. This is similar to the process used to roast coffee beans. Chemists have detected over 600 different kinds of volatile molecules in chocolate – making it one of the most aromatic foods in the world. Figure 30.3. Cacao nibs (image licensed under creative commons) The inside of the cacao bean (the bean minus the shell) is called a kernel or nib. Since the shell is made of mostly fiber, the nibs were the “guts” of the cacao seed, and contain all of the cacao butter (fat) and other cacao molecules; nibs are essentially raw chocolate. Manufacturers then grind the nibs into very, very small particles (0.02-0.03mm). The particles are so small that the resulting material - called chocolate liquor - is essentially the molecules (protein, fiber, starch, sugar phenolics, alkaloids) suspended in the fat. Chocolate liquor has a concentrated chocolate taste, but is still quite bitter, astringent and acidic. The chocolate liquor is further modified to make the chocolate we are used to eating. If most of the fat is extracted from the chocolate liquor, the resulting powdery solid is made into unsweetened cocoa powder – often used in baking. The isolated fat or cocoa butter can be added back to the chocolate liquor to increase the total amount of fat and change the consistency of the final chocolate. Table 30.2. The Composition (given in \% of chocolate weight) of different types of eating chocolate \% (percentage) by weight Chocolate liquor Added cocoa butter Added sugar Added milk solids Total fat Total carbohydrate Total protein Baking chocolate Unsweetened (solid baking chocolate) 99 0 0 0 53 30 13 Dark Chocolate (Bittersweet > semisweet) 70-35 0-15 30-50 0 25-38 45-65 4-6 Eating chocolate Dark Chocolate (sweet) 15 20 60 0 32 70 2 Milk chocolate 10 20 50 15 30 60 8 “white” chocolate 0 20 55 30 32 59 6 Unsweetened cocoa powder (also for baking, cocoa butter is removed from chocolate liquor) 20 40 15 Vanilla (bean, extract or artificial) and lecithin are also common additives to eating chocolate. Remember lecithin is a soy derived phospholipid emulsifier, and emulsifiers are amphiphilic molecules that help mix polar (hydrophilic) and non-polar (hydrophobic) molecules. Lecithin is especially useful in dark and milk chocolate where there is a large amount of added sugar. The lecithin helps the fat mix with the sugar . Typically lecithin is no more than 0.3-0.5\% of the chocolate weight. “Dutch” or alkalized cocoa powder is produced from cacao beans that have been treated with the alkaline substance, potassium carbonate. This raises the pH of the cacao beans to a neutral pH 7 or a slightly alkaline pH 8. The change in pH also has effects on the chemistry of the chocolate, the most notable of which is the reaction of flavor molecules with phenolics to produce flavorless dark colored compounds. Thus, alkalized cocoa powder is milder in flavor and has a darker color. Since natural cocoa powder is acidic and “Dutch” or alkalized cocoa powder is neutral or basic, using the right one for a recipe is important. Questions: 1. A raw cacao bean has a purple colored interior. Which of the defensive compounds within the cacao bean could be responsible for the purplish color of its interior? 2. Why is chocolate liquor… a. …essentially molecules suspended in fat? b. …acidic? 3. What molecule(s) are primarily responsible for the bitter taste of dark chocolate (the darkest chocolate is synonymous with bittersweet)? 4. Why does unsweetened cocoa powder have less than half the total fat content of unsweetened baking chocolate? 5. White chocolate seems like an oxymoron…. a. Does white chocolate contain caffeine? Why or why not? b. White chocolate has no chocolate flavor. What is the chemical explanation for this (i.e. what molecules are responsible for chocolate flavor and why doesn’t white chocolate have any?) c. Some white “chocolate” is made with solid or hydrogenated vegetable fats instead of cocoa butter. Is this stuff rightly called white chocolate? Why or why not? 6. In the Joy of Cooking, the authors recommend the following substitutions for natural or Dutch processed (alkalized) cocoa powder – if you find yourself without the necessary cocoa powder for the recipe: · Substitution for 3 tablespoons (18 grams) Dutch-processed cocoa:   3 tablespoons (18 grams) natural cocoa powder plus pinch (⅛ teaspoon) baking soda · Substitution for 3 tablespoons (18 grams) natural cocoa:   3 tablespoons (18 grams) Dutch-processed cocoa plus ⅛ teaspoon cream of tartar or ⅛ teaspoon lemon juice or vinegar What is the chemical reasoning behind these recommended substitutions? What makes chocolate so special? Model 2. One of the reasons chocolate is special is the temperature at which it melts. Chocolate melts between 94-97°F thanks to the sharp melting point of cocoa butter (the fat that comprises over half of the chocolate weight), which is right at human body temperature (~98°F). Chocolate literally “melts in your mouth”. Although cocoa butter is a plant fat, is it comprised of over half saturated fats. These saturated fats make cocoa butter a solid at room temperature (hence the “butter” reference), and the relatively small number of fatty acid types makes the cocoa butter solid melt over a relatively narrow temperature range (remember, the melting temperature of a solid is influenced by the purity/homogeneity of the solid – Activity 11). Table 30.3. \% Fatty acids that comprise the triglycerides found in the oil/fat Fats Saturated Mono unsaturated Polyunsaturated Oil/Fat Capric Acid Lauric Acid Myristic Acid Palmitic Acid Stearic Acid Oleic acid Linoleic Acid α-linolenic acid Butterfat (cow) 3 3 11 27 12 29 2 1 Cocoa butter -- -- -- 25 38 32 3 -- Olive Oil -- -- -- 13 3 71 10 1 Diets high in saturated fats may raise the risk for heart disease, which sounds like bad news for eating chocolate! However….despite cocoa butter’s higher than typical concentrations of saturated fats, the saturated fat in largest concentration – stearic acid – is immediately converted by the enzymes in the body to oleic acid, a cis monounsaturated fat. So, chocolate’s effective saturated fat content is lower thanks to the stearic to oleic acid conversion, and scientists do not believe that chocolate consumption poses cardiovascular risks. C O O C H 2 C C CH 2 C H 2 H 2 C C H 2 H 2 C C H 2 H H C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C C H 2 H 2 C CH 3 H 2 C C O O C H 2 H 2 C C H 2 H 2 C CH 2 H 2 C H 3 C Stearic Acid - an 18 carbon, saturated fatty acid (found in high concentrations in cocoa butter) part of tricglyceride part of tricglyceride enzymes in the human body Oleic Acid - an 18 carbon, cis monounsaturated fatty acid Figure 30.4. The conversion of stearic acid (a saturated fatty acid) to oleic acid (a cis monounsaturated fatty acid) by enzymes in the human body. Many people believe chocolate can alter their mood, and chocolate does contain molecules that have effects on the brain. These molecules are part of the cacao seed’s chemical defenses against predators and are present in the bean when it is harvested, fermented and roasted. Table 30.4. Psychoactive molecules found naturally in the cacao bean and therefore in chocolate Molecule Structure Physical Effects Caffeine N C N C C C N C H N O O H 3 C C H 3 C H 3 Stimulant of the central nervous system 1oz of unsweetened chocolate contains 30 milligrams of caffeine (~⅓ that found in a cup of coffee) Theobromine H N C N C C C N C H N O O C H 3 C H 3 Stimulant of the central nervous system (although weaker than caffeine) and toxic to dogs . 1oz of unsweetened chocolate contains ~300 milligrams of theobromine Anandamide H 2 C C C C C C H 2 C H 2 C C C C C H 2 H 2 C C H 2 C O N H H 2 C C H 2 O H H 2 C C H 2 H 2 C C H 2 C H 3 H H H H H H H H A molecule found in chocolate and also produced naturally by the human brain that blocks pain and depression If anandamide looks a little like a cis polyunsaturated fatty acid to you…you would be right – that’s what anandamide is made from. Phenylethylamine (PEA) H C H C C H C H C H C H 2 C C H 2 N H 2 A molecule found in chocolate and also produced naturally by the human brain which stimulates the parts of the brain that keep you alert and mimics the brain chemistry of a person in love. Scientists believe that other molecules in chocolate inhibit the breakdown of PEA in the brain, allowing its effects to last longer. But can chocolate actually be good for your heath? As a seed, the cacao bean contains alkaloids (caffeine, theobromine), anthocyanins, phenolics and polyphenols (made from phenolics) for chemical defense. Molecules like phenolics and polyphenols are great antioxidants – they protect against oxidative damage from the oxygen we breathe by reacting harmlessly with reactive oxygen species (also known as free radical oxygen). Furthermore, scientists have shown that cocoa polyphenols act as antioxidants in the human body! The polyphenols also had additional beneficial effects on cardiovascular (i.e. heart) health. All good reasons to eat chocolate! C H C C C C H C C H 2 C H C H O C C H C C H C H C O H O H H O O H O H C H C C C C H C C H 2 C C H O C C H C C C H C O H O H H O O H O H O H H C H C C H C H C H C O H H C C C H C C H C O H O H H O H C C C H C H C H C H O O H e p i c a t e c h i n e p i g a l l o c a t e c h i n p h e n o l p h e n o l i c c o m p o u n d s P o l y p h e n o l s a r e m a d e f r o m p h e n o l i c c o m p o u n d s Figure 30.5. Phenolic compounds and polyphenols found in cocoa. 7. Why is chocolate (a high fat food derived from a plant) a solid at room temperature when most plant derived fats are liquid oils? 8. Based on the structures of caffeine and theobromine, why does it make sense that both are stimulants of the central nervous system? 9. What type of “eating chocolate” (i.e. sweet dark chocolate, milk chocolate or white chocolate) is going to have the highest concentration of caffeine and theobromine and other psychoactive molecules? (i.e. what type of chocolate should you eat right before that tough final exam!) 10. Scientists at the University of Scranton have “discovered that in hamsters, cocoa powder at a dose equivalent to two dark chocolate bars per day significantly inhibited atherosclerosis, a type of heart disease in which fat clogs up arteries, and raised the levels of good cholesterol.” a. Chocolate has high levels of saturated fat. Why does this not contribute to cardiovascular (i.e. heart) problems? b. What molecules in chocolate are responsible for the beneficial cardiovascular effects? Putting it all Together: 11. Chocolate is a high fat food – and since fats go rancid, most high fat foods have a limited shelf life. However, chocolate has a remarkably long shelf life for a food that is comprised of mostly cocoa butter (fat). As we saw in Activity 11, rancid fats arise from two sources – oxygen in the air causes oxidation of the double bonds and water causes hydrolytic rancidity. Since chocolate has little moisture, the most problematic type of rancidity would be from oxygen in the air. a. What is it about the chemical composition of chocolate prevents oxidation of the fats? b. What type of typical “eating” chocolate would be most capable of preventing this oxidation? What is the chemical explanation for why? c. Chocolate’s ability to combat oxidation of its fats is also beneficial for human health. Explain why. 12. Your friend tried to make the following recipe for “Fudgy Brownies” from yummly.com - but they didn’t turn out quite as expected. The brownies were very dense and tasted less chocolatey than your friend wanted. Here is her ingredient list. Upon looking at the ingredients, you ask your friend – “what kind of cocoa powder did you use?” Your friend responds, “I forgot to buy cocoa powder at the store – so I used this Dutch cocoa powder that I found here in the pantry” Can you diagnose the problem? Why is the type of cocoa powder so important to this particular recipe? What did NOT happen as a result of the wrong cocoa powder being used? ¾ cup unsweetened cocoa powder ½ tsp baking soda ⅓ cup vegetable oil ½ cup boiling water 2 cups white Sugar 1 tsp vanilla extract ⅓ cup vegetable oil 1 ⅓ cups all-purpose flour ¼ tsp salt 2 eggs � See Activity 17_Browning for a lesson on Maillard reactions. � Milk solids are dried milk protein and sugar � Lecithin was discussed in Activity 12_Emulsions and emulsifiers � Activities 10 and 11 talk about the solid vs. liquid nature of fats, as well as fat melting temperature. � Food Fats and Oils, 9th edition. 2006. The Institute of Shortening and Edible Oils. � HYPERLINK http://www.iseo.org/httpdocs/Publications/FoodFatsOils2006.pdf �http://www.iseo.org/httpdocs/Publications/FoodFatsOils2006.pdf� Not every fatty acid is listed, so the numbers won’t add up perfectly to 100\% � These fatty acids are part of triglycerides within the fat/oil. � Dogs can suffer serious poisoning from chocolate candies, which is perhaps evidence of the cacao bean’s powerful chemical defenses against would-be predators. Copyright © 2016 Wiley, Inc. Page 9 _1497436327.cdx _1497437952.cdx _1460460866.cdx _1460460867.cdx _1396513145.cdx _1396514462.cdx _1396512620.cdx
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Develop a community-wide intervention to reduce elevated blood pressure and hypertension in the State of Alabama that in in body of the report Conclusions References (8 References Minimum) *** Words count = 2000 words. *** In-Text Citations and References using Harvard style. *** In Task section I’ve chose (Economic issues in overseas contracting)" Electromagnetism w or quality improvement; it was just all part of good nursing care.  The goal for quality improvement is to monitor patient outcomes using statistics for comparison to standards of care for different diseases e a 1 to 2 slide Microsoft PowerPoint presentation on the different models of case management.  Include speaker notes... .....Describe three different models of case management. visual representations of information. They can include numbers SSAY ame workbook for all 3 milestones. You do not need to download a new copy for Milestones 2 or 3. 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Throughout your nurse practitioner program Vignette Understanding Gender Fluidity Providing Inclusive Quality Care Affirming Clinical Encounters Conclusion References Nurse Practitioner Knowledge Mechanics and word limit is unit as a guide only. The assessment may be re-attempted on two further occasions (maximum three attempts in total). All assessments must be resubmitted 3 days within receiving your unsatisfactory grade. You must clearly indicate “Re-su Trigonometry Article writing Other 5. June 29 After the components sending to the manufacturing house 1. In 1972 the Furman v. Georgia case resulted in a decision that would put action into motion. Furman was originally sentenced to death because of a murder he committed in Georgia but the court debated whether or not this was a violation of his 8th amend One of the first conflicts that would need to be investigated would be whether the human service professional followed the responsibility to client ethical standard.  While developing a relationship with client it is important to clarify that if danger or Ethical behavior is a critical topic in the workplace because the impact of it can make or break a business No matter which type of health care organization With a direct sale During the pandemic Computers are being used to monitor the spread of outbreaks in different areas of the world and with this record 3. Furman v. Georgia is a U.S Supreme Court case that resolves around the Eighth Amendments ban on cruel and unsual punishment in death penalty cases. The Furman v. Georgia case was based on Furman being convicted of murder in Georgia. 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