Ultrasensitive Detection of Capsaicin in Oil for Fast Identification of Illegal Cooking Oil by SERRS

Abstract

Discrimination of illegal cooking oil is a conundrum in the fields of analytical chemistry and food safety due to complicated sample systems, lack of common targets, and stringent demand of ultrahigh detection sensitivity for corresponding analytical methods. Capsaicin, one of the exogenous molecules that is subsistent in recycled kitchen waste oils, can be regarded as a target for illegal cooking oil identification. Nowadays, tracing capsaicin in oils is implemented mainly by high-performance liquid chromatography–mass spectrometry, which displays shortcomings in high costs and incapableness for field test. Here, we established a surface-enhanced resonance Raman scattering approach to detect capsaicin and identify illegal cooking oils by means of the molecular derivatization treatment of capsaicin. This method features high detection sensitivity with the detection limit of 1.0 × 10 –8 M, rapid response (<7 min detection duration), and simplicity in sample pretreatment, which is available for fast field test of illegal cooking oils.

Ag/Au Nanoparticle-Loaded Paper-Based Versatile Surface-Enhanced Raman Spectroscopy Substrates for Multiple Explosives Detection

“…Surface-enhanced Raman spectroscopy (SERS) is a simple and nondestructive technique which promises numerous applications such as the trace detection of drugs, explosives, food contaminants, biological entities, and environmental hazardous gases. − In SERS technique, the intensity of inelastically scattered photon from the molecule can be enhanced using the long-range electromagnetic (EM) field and short-range chemical effects. EM enhancement is attributed to the localized surface plasmon resonance (LSPR) in the near-field metallic surface, and the chemical enhancement is because of the charge transfer (CT) mechanism between the substrate and the analyte.…”

Using magnetic levitation for density-based detection of cooking oils

“…Secondhand cooking oil has been a major issue in China, with annual consumption of over 3 million tons. 5 In this study, we demonstrated that MagLev could be potentially used for the detection of secondhand cooking oil. As shown in Fig.…”

“…For example, up to 3 million tons of secondhand cooking oils have owed back to Chinese dining tables annually. 5 These dirty secondhand cooking oils, also called "underground drainage oil" in China, generally refer to all kinds of inferior cooking oils, such as the waste oil that has been processed and reclaimed from leovers. These types of oils are extremely harmful to human health if consumed frequently.…”

Rapid determination of capsaicin concentration in soybean oil by terahertz spectroscopy

“…As a result, capsaicin is unavoidable and remains in the used oil after the frying process of pepper. Typically, it is difficult to completely remove capsaicin from recycled cooking oil with the current technology (Liu et al, 2017). Thus, capsaicin is regarded as the characteristic marker for the identification of recycled cooking oil (Lu et al, 2020;Zhou et al, 2018).…”