N, S-Doped Carbon Dots Prepared by Peanut Protein Isolates and Cysteamine As Highly Sensitive Fluorescent Sensors for Fe, Fe and Lactoferrin

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2023 Jan 8

PMID 36616565

Authors

Xinxin Wang

Xinyu Zu

Ting Wang

Yanan Zhao

Yan Liang

Xiaochen Wang

Qian Chai

Yunjuan Zhang

Hongzhong Chen

Hua Wang

Affiliations

Soon will be listed here.

Abstract

Lactoferrin (LF) is an iron-binding glycoprotein with various biological activities that has been extensively used in food and medical applications. Several methods for detecting LF have been reported, but they still face challenges in terms of sensitivity and simplicity of detection. To achieve an accurate and efficient detection of LF, we developed a method for the determination of LF in lactoferrin supplements using carbon dots (CDs) fluorescent probes. The N, S-doped PPI carbon dots (N, S-PPI-CDs) were prepared using a protein (peanut protein isolate) and cysteamine as precursors. The prepared N, S-PPI-CDs exhibited intense blue fluorescence and good biocompatibility, while the fluorescence intensity of the N, S-PPI-CDs showed a good linear relationship with Fe/Fe concentration (0-2 μM). The N, S-PPI-CDs exhibited a high potential ability to rapidly detect Fe/Fe within 30 s, with a limit of detection (LoD) of 0.21 μM/0.17 μM. Due to the reversible binding of LF to Fe, the N, S-PPI-CDs showed a high sensitivity and selectivity for LF, with a limit of detection (LoD) of 1.92 μg/mL. In addition, LF was quantified in real sample LF supplements and showed a fluctuation in recovery of less than 2.48%, further demonstrating the effectiveness of the fluorescent N, S-PPI-CDs sensor.

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