Chapter 3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What chemical elements proteins may have
Carbon, N,O, S, fe, Cu, P, zn
what is the name of the central atom
alpha-carbon
What groups serves as an acid and as a base in AAs
carboxyl group-acid amino-base
General formula for AAs
H2NCHRCOOH
What side chains are more soluble in water
Polar
what AAs will form hydrogen bonds with other molecules
Polar-neutral
What AAs can act as buffers
Positively and negatively charged
How many different proteins in the body ( estimate)
50000
How many AAs can be linked in a chain
20-33000
Essential AAs
Histidine Isoleucine Leuicine methionine Phenylalanine threonine tryptophan Valine Lysine
Non essential AAs
Alanine Asparagine Aspartic acid Glutamic acid Serine
Conditionally essential AAs
Arginine Cysteine Glutamine Glycine Proline Tyrosine
Complete protein
Animal protein: eggs, milk, meat
How can you get complete protein from plant sources
Combining incomplete proteins, such as beans and rice
What is the component in food that is responsible for aallergies
Proteins
Role of proteins in food
• Structure and physiochemical properties - an ingredient in terms of functional properties and nutritional value
Protein responsible for milk allergies
Beta-lactoglobulin
2 types of secondary structures
Alpha-helix Beta-pleated sheet
secondary structure of proteins are held together by
Hydrogen bonds
Proteins are folded in alpha and beta-pleated sheets , but other parts can be ___
Unordered or random
Beta-lactoglobulin acts as
A dimer
what can result in protein denaturation ( loss of secondary and/or tertiary structure)
pH, temperature, mechanical actions,sound waves and irradation, mineral salts (sodium or k salts)
How protein denaturation is used in food industry
Denaturation of protein-> denaturation of enzymes that are responsible for deterioration
How can you denature egg proteins
Solidification/opaqueness -. when heated , egg white turns white Production of foam when egg white is whipped is due to encapsulation of air bubbles by surface-denatured protein molecules