Abbreviations	Definitions
AA	Ascorbic acid
AAE	Ascorbic acid equivalent
ALC	Average local confidence
Ala	Alanine
AP-1	Activator protein 1
Arg	Arginine
Asn	Asparagine
Asp	Aspartic acid
CCD	Central composite design
CE	Crude extract
Cys	Cysteine
DEX	Dexamethasone
DH	Degree of hydrolysis
DPPH	2,2-diphenyl-1-picrylhydrazyl
E/S	Enzyme-substrate concentration
ECM	Extracellular matrix
GAPDH	Glyceraldehyde 3-phosphate dehydrogenase
Glu	Glutamic acid
Gln	Glutamine
Gly	Glycine
HaCaT	Immortalized human keratinocyte
His	Histidine
IC20	Concentration reducing cell viability by 20%
IC50	Half-maximal inhibitory concentration
Ile	Isoluecine
kDa	Kilodaltan
Lue	Luesine
Lys	Lysine
NF-κB	Nuclear factor kappa B
MAPKs	Mitogen-activated protein kinases
Met	Methionine
MMPs	Matrix metalloproteinases
MW	Molecular weight
OA	Oleanolic acid
OAE	Oleanolic acid equivalent
PC	Protein concentration
PH	Protein hydrolysate
Phe	Phenylalanine
Pro	Proline
RSM	Response surface methodology
Ser	Serine
Smad	Suppressor of mothers against decapentaplegic
TE	Trolox
TGF	Transforming growth factor
Thr	Threonine
Trp	Trptophan
Tyr	Tyrosine
UV	Ultraviolet
Val	Valine
VC	Vehicle control