Rapid and sensitive SERS detection of food contaminants by using nano-Ag aggregates with controllable hydrophobicity

2021 ◽  
pp. 106221
Author(s):  
Ling Yao ◽  
Lei Ouyang ◽  
Jiping Lv ◽  
Pei Dai ◽  
Lihua Zhu
Keyword(s):  
Food Contaminants ◽  
Sers Detection

Microdroplet-captured tapes for rapid sampling and SERS detection of food contaminants

2020 ◽  
Vol 152 ◽  
pp. 112013 ◽  
Author(s):  
Xuecheng He ◽  
Shijie Yang ◽  
Tailin Xu ◽  
Yongchao Song ◽  
Xueji Zhang
Keyword(s):  
Food Contaminants ◽  
Rapid Sampling ◽  
Sers Detection

Diet and Contaminants: Driving the Rise to Obesity Epidemics?

2019 ◽  
Vol 26 (19) ◽  
pp. 3471-3482 ◽  
Author(s):  
Agostino Di Ciaula ◽  
Piero Portincasa
Keyword(s):  
Dietary Habits ◽  
Maternal Diet ◽  
Critical Role ◽  
Food Contaminants ◽  
Obesity Epidemic ◽  
Gene Environment ◽  
Generational Transmission ◽  
Modifiable Factors ◽  
Toxic Food ◽  
Diet And Lifestyle

The obesity epidemic is spreading worldwide without reversal trend and despite specific policies oriented to dietary habits and lifestyle, which seem to have modest effects. Genetic factors only partly explain the rise, whereas environmental factors seem to play a key role, mainly by gene-environment interactions through epigenetic mechanisms. A number of animal and human studies point to maternal diet, intestinal microbiota and chemicals introduced as contaminants with food, all factors able to increase the risk of obesity. Widely diffused toxics (mainly BPA, phthalates, pesticides) are able to promote obesity in children and adults, mainly by acting on the differentiation pathway linking multipotent stromal stem cell to mature adipocyte, modulating epigenetic factors and influencing a series of mechanisms finally leading to altered dietary habits, increased adipocyte formation and fat storage. Furthermore, the adipose tissue is an important target for several chemicals (mainly POPs) which represent a threat to metabolic health. In conclusion, besides excessive individual energy intake and inadequate lifestyle, other broadly diffused and modifiable factors (mainly ingestion of toxic chemicals with food) seem to have a critical role in the rapid epidemiological growing of obesity, also considering trans-generational transmission of risk and later development of obesity due to exposure during early life. Further studies are needed, to better assess interactions between cumulative effects of toxic food contaminants and modification of diet and lifestyle, and to verify the efficacy of primary prevention strategies acting on all these factors and potentially able to reverse the continuous rising of the obesity epidemic.

scholarly journals Effects of Mycotoxins on the Intestine

Toxins ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 159 ◽  
Author(s):  
Imourana Alassane-Kpembi ◽  
Philippe Pinton ◽  
Isabelle Oswald
Keyword(s):  
Gastrointestinal Tract ◽  
Food Contaminants ◽  
Physiological Barrier

The gastrointestinal tract is the first physiological barrier against food contaminants, as well as the first target for these toxicants [...]

Simultaneous SERS detection of illegal food additives rhodamine B and basic orange II based on Au nanorod-incorporated melamine foam

2021 ◽  
pp. 129741
Author(s):  
Yingying Sun ◽  
Wan Li ◽  
Liqing Zhao ◽  
Fengyong Li ◽  
Yunfei Xie ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Food Additives ◽  
Orange Ii ◽  
Sers Detection ◽  
Melamine Foam

Multivariate Analysis Aided Surface-Enhanced Raman Spectroscopy (MVA-SERS) Multiplex Quantitative Detection of Trace Fentanyl in Illicit Drug Mixtures Using a Handheld Raman Spectrometer

2021 ◽  
pp. 000370282110329
Author(s):  
Ling Wang ◽  
Mario O. Vendrell-Dones ◽  
Chiara Deriu ◽  
Sevde Doğruer ◽  
Peter de B. Harrington ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Principal Component ◽  
Surface Enhanced Raman Spectroscopy ◽  
Quantitative Detection ◽  
Least Squares Regression ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Current Screening

Recently there has been upsurge in reports that illicit seizures of cocaine and heroin have been adulterated with fentanyl. Surface-enhanced Raman spectroscopy (SERS) provides a useful alternative to current screening procedures that permits detection of trace levels of fentanyl in mixtures. Samples are solubilized and allowed to interact with aggregated colloidal nanostars to produce a rapid and sensitive assay. In this study, we present the quantitative determination of fentanyl in heroin and cocaine using SERS, using a point-and-shoot handheld Raman system. Our protocol is optimized to detect pure fentanyl down to 0.20 ± 0.06 ng/mL and can also distinguish pure cocaine and heroin at ng/mL levels. Multiplex analysis of mixtures is enabled by combining SERS detection with principal component analysis and super partial least squares regression discriminate analysis (SPLS-DA), which allow for the determination of fentanyl as low as 0.05% in simulated seized heroin and 0.10% in simulated seized cocaine samples.

scholarly journals High Pressure Processing Impact on Alternariol and Aflatoxins of Grape Juice and Fruit Juice-Milk Based Beverages

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3769
Author(s):  
Noelia Pallarés ◽  
Albert Sebastià ◽  
Vicente Martínez-Lucas ◽  
Mario González-Angulo ◽  
Francisco J. Barba ◽  
...  
Keyword(s):  
High Pressure ◽  
Thermal Treatment ◽  
Orange Juice ◽  
Grape Juice ◽  
Good Alternative ◽  
High Pressure Processing ◽  
Life Extension ◽  
Food Contaminants ◽  
Dispersive Liquid Liquid Microextraction ◽  
Strawberry Juice

High-pressure processing (HPP) has emerged over the last 2 decades as a good alternative to traditional thermal treatment for food safety and shelf-life extension, supplying foods with similar characteristics to those of fresh products. Currently, HPP has also been proposed as a useful tool to reduce food contaminants, such as pesticides and mycotoxins. The aim of the present study is to explore the effect of HPP technology at 600 MPa during 5 min at room temperature on alternariol (AOH) and aflatoxin B1 (AFB1) mycotoxins reduction in different juice models. The effect of HPP has also been compared with a thermal treatment performed at 90 °C during 21 s. For this, different juice models, orange juice/milk beverage, strawberry juice/milk beverage and grape juice, were prepared and spiked individually with AOH and AFB1 at a concentration of 100 µg/L. After HPP and thermal treatments, mycotoxins were extracted from treated samples and controls by dispersive liquid–liquid microextraction (DLLME) and determined by HPLC-MS/MS-IT. The results obtained revealed reduction percentages up to 24% for AFB1 and 37% for AOH. Comparing between different juice models, significant differences were observed for AFB1 residues in orange juice/milk versus strawberry juice/milk beverages after HPP treatment. Moreover, HPP resulted as more effective than thermal treatment, being an effective tool to incorporate to food industry in order to reach mycotoxins reductions.

Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration

2020 ◽  
Vol 9 (1-2) ◽  
pp. 89-100 ◽  
Author(s):  
Xinyu Hu ◽  
Rui Pan ◽  
Mingyong Cai ◽  
Weijian Liu ◽  
Xiao Luo ◽  
...  
Keyword(s):  
Rhodamine 6G ◽  
Optimal Parameter ◽  
Solute Concentration ◽  
Processing Parameter ◽  
Detection Techniques ◽  
Peak Intensity ◽  
Target Analytes ◽  
Sers Detection ◽  
Scanning Path ◽  
Evaporation Concentration

AbstractEvaporation concentration of target analytes dissolved in a water droplet based on superhydrophobic surfaces could be able to break the limits for sensitive trace substance detection techniques (e.g. SERS) and it is promising in the fields such as food safety, eco-pollution, and bioscience. In the present study, polytetrafluoroethylene (PTFE) surfaces were processed by femtosecond laser and the corresponding processing parameter combinations were optimised to obtain surfaces with excellent superhydrophobicity. The optimal parameter combination is: laser power: 6.4 W; scanning spacing: 40 μm; scanning number: 1; and scanning path: 90 degree. For trapping and localising droplets, a tiny square area in the middle of the surface remained unprocessed for each sample. The evaporation and concentration processes of droplets on the optimised surfaces were performed and analyzed, respectively. It is shown that the droplets with targeted solute can successfully collect all solute into the designed trapping areas during evaporation process on our laser fabricated superhydrophobic surface, resulting in detection domains with high solute concentration for SERS characterisation. It is shown that the detected peak intensity of rhodamine 6G with a concentration of 10−6m in SERS characterisation can be obviously enhanced by one or two orders of magnitude on the laser fabricated surfaces compared with that of the unprocessed blank samples.

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