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Summary: Chf
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2 prot
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Proteins peptides and a-a
A-a
amino group NH2 and carboxylgroup COOH
(oligopepptides
2-100 A-a
CNOC
100-300 a-a -
2.4 prot struct
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3d structure analysis
X ray
space filling model
NMR
stabilised by
electrostatic and hydrophobic
disulfide bonds - covalent
van der waals
fixed structure in space and time - terriary structure -
Structure stab influcnecy by
Presenc of reducing agent
temp
solvent
ph and isoelectric point -
4 ph com
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Basic skeleton phenolic compounds/polyphenols/phenolics
Benzene ring C6 + OH group
can be subtistures by
multiple OH groups
aliphaitc C chains
another benzene ring -
Monomeric dimeric, oligo/polymeric
Monomeric 1 benzene
dimeric 2 benzene
oligopoly is >2 -
4.1 hydroxycinnamic acids (derivaties) monmeric
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Hydroxycinnamic acid derivatices
- free
- bound to mono/ ologsaccharides
- aster of polysaccharides (wheeat aarbinxylans -
4.2 flavanoids (dimeric)
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Structure (iso)falvonaids
C6C3C6 structure
-free or bound to sugars
- many plants (prot UV light, atract insets birds) -
Free or bound form
Free aglycon
bound glycosylated -
4.3 tannins
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Condensed tannins/proanthocyanidins
-present many plant food
natually occuring oligomers of flavanoids --> formed enzymatic oxidation, during procesing
DP - degrreee of polymerizations 2-20 -
Properties of condensed tannins
-formation of insoluble particles (haze formation)
-inacivation of enzymes
-astringenct (consumpt wine/tea)
-diminshed digestability of other food constitrents present in food
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