Card 281
Question
What is TBHQ?
Answer
Antioxidant, tert-butylhydroquinone.
Food Chemistry
Discover Food Chemistry: 945 flashcards with questions and answers.
- Subject
- Sciences / Chemistry
- Language of creation
- English
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Cards in this set
Card 282
Question
What can chelating agents be used for in foods?
Answer
Antioxidants
Card 283
Question
Define apparent acidity.
Answer
Apparent acidity is the measure of the total acid content (free and bound acids) in a food, often determined by titration, reflecting the overall acidic character rather than just free hydrogen ions.
Card 284
Question
What is poising capacity?
Answer
Apparent resistance to change in redox potential
Card 285
Question
What is the term for when electrons occupy free orbitals of cations in a salt/water solution?
Answer
Aqua complex
Card 286
Question
Give two amino acids which contain two ammonium and related groups.
Answer
Arginine, lysine
Card 287
Question
What chemical structure is common to all phenolic compounds?
Answer
Aromatic ring w/a hydroxyl group
Card 288
Question
What is the isoelectric point of casein?
Answer
Around pH 4.6
Card 289
Question
What is the isoelectric point of casein?
Answer
Around pH 4.6
Card 290
Question
What is the name that is associated with the 1889 discovery of the temperature dependence of reaction rates?
Answer
Arrhenius
Card 291
Question
What two common compounds are used together as an antioxidative system in food?
Answer
Ascorbic Acid and Citric Acid
Card 292
Question
What amino acid in fried potatoes leads to the formation of acrylamide?
Answer
Asparagine
Card 293
Question
What are the Positive/Acidic Amino acids?
Answer
Aspartic acid and glutamic acid
Card 294
Question
What carotenoid when bound to specific protein is responsible for lobster's distinct pink orange color after cooking?
Answer
Astaxanthin
Card 295
Question
What color is grape juice at pH 2 and pH 8?
Answer
At pH 2, grape juice is red; at pH 8, it is blue-green.
Card 296
Question
When does the maximum buffering capacity occur in a food product?
Answer
At the pKa, the point where equal amounts of the undissociated acid and weak base (salt) exist in the food matrix
Card 297
Question
What lipid oxidation mechanism involves free radical chain reactions?
Answer
Autoxidation
Card 298
Question
What reaction causes lipid oxidation initiated by free radicals?
Answer
Autoxidation.
Card 299
Question
What does the BET equation relate to for foods?
Answer
Aw of monolayer of water
Card 300
Question
Define water activity.
Answer
Aw= vapro pressure of solution/ vapor pressure of pure H2O at same temp
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