Construction of in situ modulated controlled growth of MOF-on-mof impedimetric assembly for the practical minimal level assessment of anti-mullerian hormone

Anti-mullerian hormone (AMH) detection receives much attention since it is used as an ideal biomarker for quantitative assessment of ovarian reserve. The present study proposed a first report on the use of MOF-on-MOF as an electrochemical sensor for recognizing AMH in buffer and serum media. The MOF-on-MOF, MIL-88 B@UiO66NH₂ was synthesized by the internal extended growth method (IEGM) involving MIL-88 B on UiO66NH₂ by in situ method for the first time. MOF matrix could be established to form a three-dimensional (3D) core-shell hybrid unit using MOFs with distinct characteristics. The morphology, structural characteristics, and electrochemical performance of MIL-88 B@UiO66NH₂ were studied. It was successfully used for AMH sensing to demonstrate the detection performance of the internal extended growth method (IEGM) grown MIL-88 B@UiO66NH₂ made immunosensor. The electrochemical results indicated that MOF-on-MOF exhibited linear EIS response for AMH concentration varying from 100 ng/mL to 1 fg/mL. Further, the immunosensor displayed high specificity and sensitivity for AMH detection. The fabricated sensor attained a remarkable limit of detection (LOD) of 1.07 fg/mL and 0.82 fg/mL, when studied in PBS and 10% serum buffer media, respectively. The biosensor achieved the limit of quantification (LOQ) of 3.25 fg/mL and 2.5 fg/mL, respectively, when analyzed in PBS buffer and 10% serum buffer. The significant results emphasized that the fabricated biosensor holds a promising potential to act as an appropriate tool for rapid assessment of AMH levels.