▎ 摘　　要

NOVELTY - Preparation of hydroxypropyl beta -cyclodextrin functionalized graphene oxide chiral composite material involves preparing hydroxypropyl beta -cyclodextrin powder, uniformly dispersing graphene oxide in ultrapure water to form a graphene oxide dispersion, dispersing the prepared powder in ultrapure water, adding ammonia to adjust pH to 8-9, adding the graphene oxide dispersion and hydrazine hydrate, stirring for 10-15 minutes at normal temperature, heating to 60-65 degrees C for 4-5 hours, filtering, washing and drying. USE - Preparation of hydroxypropyl beta -cyclodextrin functionalized graphene oxide chiral composite material used as chiral electrochemical sensor for identifying tryptophan enantiomers (claimed). ADVANTAGE - The functionalized graphene oxide chiral composite material provides sensor having excellent recognition ability with respect to tryptophan. DETAILED DESCRIPTION - Preparation of hydroxypropyl beta -cyclodextrin functionalized graphene oxide chiral composite material involves dispersing beta -cyclodextrin in an alkaline solution, stirring at room temperature for 5-6 hours, freezing in a refrigerator at -18 degrees C to -25 degrees C for 20-24 hours, adding propylene oxide, reacting at room temperature for 40-48 hours, adding hydrochloric acid to adjust the pH to 6-7, heating to 45-50 degrees C, filtering, recrystallizing with acetone, vacuum-drying at 50-60 degrees C for 60-72 hours to obtain white hydroxypropyl beta -cyclodextrin powder, uniformly dispersing graphene oxide in ultrapure water to form a graphene oxide dispersion, dispersing the prepared powder in ultrapure water, adding ammonia to adjust pH to 8-9, adding the graphene oxide dispersion and hydrazine hydrate, stirring for 10-15 minutes at normal temperature, heating to 60-65 degrees C for 4-5 hours, filtering, washing and drying. An INDEPENDENT CLAIM is included for application of hydroxypropyl beta -cyclodextrin functionalized graphene oxide chiral composite material as sensor for identifying tryptophan enantiomers, which involves dispersing the composite material in ultrapure water, applying on the surface-polished glass-carbon electrode, drying to form sensor, placing the sensor in a solution of L-tryptophan and D-tryptophan, processing at a scan potential of 0.4-1.3 V, and identifying the chirality of tryptophan enantiomers.