[Rapid screening the alkaloids of poppy shell in hot pot condiment, beef noodle soup and seasoning by direct analysis in real time-tandem mass spectrometry].
Zhang Baile,Gao Lihong,Xie Yingshuang,Zhou Wei,Chen Xiaofeng,Lei Chunni,Zhang Huan
Se pu = Chinese journal of chromatography
A direct analysis in real time tandem mass spectrometry (DART-MS/MS) method was established for quickly screening five illegally added alkaloids of poppy shell from the hot pot condiment, beef noodle soup and seasoning. The samples were extracted and purified by acetonitrile, and then injected under the conditions of ionization temperature of 300℃, grid electrode voltage of 150 V and sampling rate of 0.8 mm/s using DART in the positive ion mode. The determination was conducted by tandem mass spectrometry in positive ESI mode under multiple reaction monitoring (MRM) mode. The method is simple and rapid, and can meet the requirement of rapid screening and analysis of large quantities of samples.
Solid-phase microextraction based on nickel-foam@polydopamine followed by ion mobility spectrometry for on-site detection of Sudan dyes in tomato sauce and hot-pot sample.
Sun Tangqiang,Wang Mengyu,Wang Di,Du Zhenxia
Sudan dyes are one kind of synthetic azo dyes that are forbidden to use in foodstuffs according to the European Union Rule. In this work, considering the structure of Sudan dyes, nickel-foam@polydopamine (NF@PDA) was prepared through the self-polymerization of dopamine on the nickel-foam surface under weak alkaline conditions and used as SPME material to selectively extract the Sudan dyes. With the feature of three dimension (3D) cross-linked grid structure, large porosity and specific surface area, Ni-foam was selected as carrier material which can increase mass adsorption capacity. The primary parameters affecting extraction efficiency such as extraction time, extraction temperature, stirring speed, pH value, ionic strength and desorption time were investigated and optimized. After the Sudan dyes were eluted from the NF@PDA, the eluate was detected by IMS with a corona discharge (CD) ionization source. Thus, an innovative and rapid screening method coupling the NF@PDA to ion mobility spectrometry (IMS) was developed. Under the optimal extraction conditions, the detection limits for Sudan dyes were in the range from 0.005 μg g to 0.25 μg g. The spiked recoveries were in the range from 81% to 91.3% by testing tomato sauce and hot-pot sample and validated by the UPLC-MS. Based on the results, the PDA coating has great ability for the extraction of Sudan dyes, mainly due to the catechol structure, electron-deficient quinones and amine groups on its surface. Thus, the developed method has great potential for on-site rapid screening of the Sudan dyes in food quarantine field.
Investigation of colour requirements of frozen beef rolls by Chinese consumers for hot pot.
Wang Fangfang,Holman Benjamin W B,Zhang Yimin,Luo Xin,Mao Yanwei,Hopkins David L
A study was undertaken to establish a consumer threshold for the colour of beef rolls used for hot pot cooking in China. This was achieved by using an internet-based online survey, in which Chinese respondents recorded their preferred meat colour from a selection of 12 different images that represented a range of objective colour measures (CIE colorimetrics). The results indicated that, of the 2021 respondents, 97.6% liked to eat hot pot. When colour preference was modelled against objective measures of colour, the a* value was identified as providing the most suitable insight into respondents' preferences for the colour of frozen beef rolls to be used in hot pot cooking. Based on the results an acceptance threshold of a* value ≥16.4 proposed.
From waste hot-pot oil as carbon precursor to development of recyclable attapulgite/carbon composites for wastewater treatment.
Tang Jie,Mu Bin,Zong Li,Wang Aiqin
Journal of environmental sciences (China)
The utilization of waste products as valuable materials was a technical imperative for waste management. In this study, the cost-effective attapulgite/carbon (APT/C) composite was developed for wastewater treatment using waste hot-pot oil as a carbon precursor through a facile one-step calcination process. The APT/C composite prepared at 300°C exhibited the excellent adsorption capacity and rapid equilibrium rate over a broad pH range for the removal of various pollutants. More importantly, the removal ratios of the composites toward Methyl Violet and tetracycline still remained 77.6% and 60.2% of the initial adsorption capacity after ten adsorption-regeneration cycles via a facile thermal regeneration strategy, respectively. Beyond all doubt, this research provided a feasible and economical way for the sustainable utilization of waste hot-pot oil in wastewater treatment, achieving the concept of disposal waste with waste and recycling.