Sodium citrate

All chemicals were purchased from commercial suppliers without further purification unless mentioned otherwise. Tetrakis(4-carboxyphenyl)porphyrin (TCPP, 97%), 1-octanol (99%) and copper acetate monohydrate (Cu(CH₃COO)₂·H₂O, 99%) were purchased from TCI. Hydrogen tetrachloroaurate trihydrate (HAuCl₄·3H₂O, 99.9%), sodium borohydride (99%), sodium citrate (99.8%), 4-nitrophenol (4-NP, 99%), and dimethylformamide (DMF, 99.8%) were purchased from Adamas.

Inositol hexakisphosphate aqueous solution (IP₆, 90%) was purchased from Sigma-Aldrich. FeCl₃·6H₂O (99%), FeCl₂·4H₂O (99%), NaOH (≥96.0%), sodium citrate (Na₃C₆H₅O₇·2H₂O, 99.8%), and rhodamine 6G (R6G) were from Adamas Reagent. Cyclohexane (CYH, 99.5%) and absolute alcohol (CH₃CH₂OH) were obtained from Macklin Reagent (Shanghai, China). Chloroauric acid (HAuCl₄·4H₂O, 99.9%) was bought from Sinopharm Chemical Reagent (Shanghai, China). MDA was provided by Zhejiang Police College, Hangzhou. All reagents were used without further purification. All solutions were made with ultrapure water (18.25 MΩ cm), which was produced by using a Millipore water purification system.