Publications by authors named "Hua-Li He"
A unique luminescent lanthanide metal-organic framework (LnMOF)-based fluorescence detection platform was utilized to achieve sensitive detection of vomitoxin (VT) and oxytetracycline hydrochloride (OTC-HCL) without the use of antibodies or biomolecular modifications. The sensor had a fluorescence quenching constant of 9.74 × 10 M and a low detection limit of 0.
View Article and Find Full Text PDFOccurrence and exposure risk assessment of pesticide residues in green tea samples cultivated in Hangzhou area, China.
Food Addit Contam Part B Surveill
March 2023
The concentration of pesticide residues in 105 green tea samples grown in Hangzhou area were investigated. Of the 14 pesticides analysed using gas chromatography-tandem mass spectrometry and the 27 pesticides analysed using liquid chromatography-tandem mass spectrometry, only 18 were detected in the tea samples. The most frequently detected pesticide residues were imidacloprid (35.
View Article and Find Full Text PDFArticle Synopsis
- The study analyzed 151 samples of Fragaria and Myrica rubra from Hangzhou, China, using advanced mass spectrometry techniques to detect pesticide residues.
- A total of 41 different pesticide residues were identified, with 10 found in Fragaria and 20 in M. rubra, including high detection rates of procymidone and prochloraz.
- Some samples exceeded China's maximum allowable pesticide residue limits, with specific concerns noted for dimethomorph in Fragaria and dichlorvos in M. rubra.
Monochloropropanediol in edible vegetable oils from Hangzhou market in China: occurrence and exposure risk assessment.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
November 2021
In this study, 241 vegetable-oil food samples were collected from the Hangzhou market in China and analysed for fatty acid esters of 3- and 2-monochloropropanediol (3-MCPD and 2-MCPD) using non-derivative gas chromatography tandem mass spectrometry (GC-MS/MS). Food consumption data were taken from a food consumption survey of urban and rural residents in Hangzhou city performed in 2010-2011. Levels of 3-MCPD esters in edible oil ranged from not detected to 7.
View Article and Find Full Text PDFDetermination of phthalate esters in breast milk before and after frozen storage in milk storage bags.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
November 2020
Article Synopsis
- - This study investigated how 20 phthalates migrate from breast milk storage bags into breast milk after being frozen for 1 to 6 months, using GC-MS/MS for analysis.
- - Nine phthalates were found in some storage bags, and six in breast milk samples, with dibutyl phthalate (DBP) being the most notable, reaching 211.2 µg/kg in one sample.
- - Overall, while some migration of phthalates like DIBP, DBP, and DEHP increased with storage time, all measurements remained below safety limits, and the daily intake levels were well within safe limits.
Detection of 20 phthalate esters in breast milk by GC-MS/MS using QuEChERS extraction method.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
October 2019
Article Synopsis
- A new detection method for 20 phthalate esters in breast milk was developed using a QuEChERS clean-up technique combined with quantitative GC-MS/MS analysis.
- The method effectively removes interfering substances like lipids using acetonitrile and clean-up materials, achieving recoveries between 83.3% and 123.3%.
- In a study of 35 breast milk samples, five specific phthalates were detected at median levels, demonstrating the method's speed, sensitivity, and accuracy in analyzing breast milk and dairy products.
Article Synopsis
- Phthalate esters (PAEs) are commonly used as plasticizers in food packaging, and this study presents a new method for detecting 20 types of PAEs in these materials.
- The method involves extracting samples with a mixture of acetonitrile and hexane and detecting them using GC-MS/MS without the need for purification, ensuring efficiency.
- The results show high accuracy with recovery rates between 82.1% and 110.8%, making the method reliable for large-scale detection of PAEs in plastics.
Both 3-monochloropropane-1,2-diol (3-MCPD) and acrylamide are contaminants found in heat-processed foods and their related products. A quantitative method was developed for the simultaneous determination of both contaminants in food by gas chromatography-triple quadrupole mass spectrometry (GC-MS/MS). The analytes were purified and extracted by the matrix solid-phase dispersion extraction (MSPDE) technique with Extrelut NT.
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