ACh	Acetylcholine
AD	Alzheimer’s disease
AE-COS	Aminoethyl-chitooligosaccharides
Aβ	β-Amyloid
BACE	β-Site amyloid precursor protein-cleaving enzyme
CAT	Catalase
Cd	Cadmium
CM-QAOC	Carboxymethyl-quaternary ammonium oligochitosan
CNP	Chitosan nanoparticles
COS	Chitooligosaccharide
COX	Cyclooxygenase
CSO-DA NPs	Decanoic acid grafted oligochitosan nanoparticles
CSO-SA	Stearic acid-g-chitosan oligosaccharide
Cy	Cyclophosphamide
DEAE	Diethylaminoethyl
DE3	Escherichia coli BL21
DMEM	Dimethylaminoethyl
DTH	Delayed-type hypersensitivity
EEP	Extracellular enzymes preparation
EPEC	Enteropathogenic Escherichia coli
ESI	Electrospray ionization
GlcN	Glucosamine
GlcNAc	N-Acetylglucosamine
GSH	Glutathione
HB-COS	4-Hydroxybenzaldehyde-COS
HO-1	Heme oxygenase-1
HPLC	High performance liquid chromatography
IFN	Interferon
Ig	Immunoglobulin
iNOS	Inducible nitric oxide synthase
IL	Interleukin
IR	Infrared
MALDI-TOF	Matrix-assisted laser desorption ionization time of flight
MDA	Malondialdehyde
MS	Mass spectrometry
NADPH	Nicotinamide adenine dinucleotide phosphate
NMR	Nuclear magnetic resonance
Pa-COS	Partially acetylated COS
PCV2	Porcine circovirus type 2
PVA/COS-AgN	Silver nanoparticle/COS/ poly (vinyl alcohol)
SCOS	Sulfated chitooligosaccharide
SOD	Superoxide dismutase
TIC	Thin-layer chromatography
UV-Vis	Ultraviolet/visible
WSC	Water-soluble chitosan