• 专利标题:   Preparing fluorescent carbon quantum dots for forensic analysis and anti-counterfeiting ink, involves filtering formed juice of Pyrostegia venusta flower petals, microwave treating, cooling formed fluid, filtering supernatant solution, adding corn flour and embedding quantum dots in flour matrix.
  • 专利号:   IN202311017981-A
  • 发明人:   BERA M K, SINGH V, SHARMA V D, KANSAY V, SINGLA G
  • 专利权人:   UNIV MAHARISHI MARKANDESHWAR
  • 国际专利分类:   A61B005/1172, B82Y020/00, B82Y040/00, C09K011/65, G01N021/64
  • 专利详细信息:   IN202311017981-A 31 Mar 2023 A61B-005/1172 202330 English
  • 申请详细信息:   IN202311017981-A IN11017981 16 Mar 2023
  • 优先权号:   IN11017981

▎ 摘  要

NOVELTY - Preparation of Pyrostegia venusta derived fluorescent carbon quantum dots (CQDs)and composite, and their use for latent fingerprint and anti-counterfeit applications, involves: 1) collecting Pyrostegia venusta flower petals and rinsing in deionized water; 2) chopping flowers and boiling to obtain juice; 3) filtering formed juice, to remove fibrous impurities; 4) sonicating mixture; 5) subjecting mixture to microwave; 6) microwave treating until brown viscous fluid is formed; 7) cooling formed solution, centrifuging to form supernatant solution; 8) removing any remaining impurities not removed by centrifugation, by filtering the supernatant solution; 9) adding 5g commercial corn flour and a drop casting CQDs solution (3-4 ml), with a 20 μl pipette while vigorously stirring; and t. embedding the CQDs in the corn flour matrix after grinding into a fine powder. USE - Method is used for preparing Pyrostegia venusta derived fluorescent carbon quantum dots and their composite used in forensic analysis and anti-counterfeiting ink. ADVANTAGE - The prepared fluorescent carbon quantum dots enable efficient, rapid, portable and user-friendly fingerprint detection. A proof-of-concept anti-counterfeiting tag, based on prepared carbon quantum dots CQDs ink, is also exhibited by the use of biocompatible and non-toxic fluorescent CQDs obtained from the begonia flower Pyrostegia venusta. DETAILED DESCRIPTION - Facile one-step microwave-assisted green synthesis of Pyrostegia venusta derived fluorescent carbon quantum dots (CQDs)and composite, as well as their use for latent fingerprint and anti-counterfeit applications, involves: 1) collecting Pyrostegia venusta flower petals and thoroughly rinsing in deionized water; 2) chopping the flowers into pieces and boiling to obtain juice; 3) using Whatman qualitative filter paper (grade 1) to filter formed juice, to remove fibrous impurities; 4) sonicating the mixture obtained in step 3, for 15 minutes, at room temperature; 5) subjecting the mixture to microwave, at power 127.5-750 watts (W); 6) processing in microwave until a brown viscous fluid is obtained, based on the fluorescence intensity, using 360W (medium low) microwave synthesis solution; 7) cooling the formed solution to room temperature, centrifuging for 15 minutes, at speed 7000-8000 rotations/minute (rpm), to form the supernatant solution; 8) removing any remaining impurities not removed by centrifugation, by filtering the supernatant solution, through a 0.22 micrometer syringe filter (polytetrafluoroethylene membrane); 9) adding 5g commercial corn flour and a drop casting CQDs solution (3-4 ml), with a 20 μl pipette while vigorously stirring; and t. embedding the CQDs in the corn flour matrix after grinding into a fine powder.