It is our pleasure to invite you to read the selected papers from the “Editor’s Choice Articles” in 2021. The selected papers are listed below:

1. “Analysis of Monoclonal Antibodies by Capillary Electrophoresis: Sample Preparation, Separation, and Detection”
by Meriem Dadouch, Yoann Ladner and Catherine Perrin
Separations 2021, 8(1), 4; https://doi.org/10.3390/separations8010004
Available online: https://www.mdpi.com/2297-8739/8/1/4

2. “Hydrophilic Interaction Liquid Chromatography to Characterize Nutraceuticals and Food Supplements Based on Flavanols and Related Compounds”
by Oscar Vidal-Casanella, Kevin Arias-Alpizar, Oscar Nuñez and Javier Saurina
Separations 2021, 8(2), 17; https://doi.org/10.3390/separations8020017
Available online: https://www.mdpi.com/2297-8739/8/2/17

3. “Overview of Sample Preparation and Chromatographic Methods to Analysis Pharmaceutical Active Compounds in Waters Matrices”
by Cristina M. M. Almeida
Separations 2021, 8(2), 16; https://doi.org/10.3390/separations8020016
Available online: https://www.mdpi.com/2297-8739/8/2/16

4. “Influence of Citrus Flavor Addition in Brewing Process: Characterization of the Volatile and Non-Volatile Profile to Prevent Frauds and Adulterations”
by Emanuela Trovato, Adriana Arigò, Federica Vento, Giuseppe Micalizzi, Paola Dugo and Luigi Mondello
Separations 2021, 8(2), 18; https://doi.org/10.3390/separations8020018
Available online: https://www.mdpi.com/2297-8739/8/2/18

5. “Enhanced Photocatalytic Activity of CuWO₄ Doped TiO₂ Photocatalyst Towards Carbamazepine Removal under UV Irradiation”
by Chukwuka Bethel Anucha, Ilknur Altin, Emin Bacaksız, Tayfur Kucukomeroglu, Masho Hilawie Belay and Vassilis N. Stathopoulos
Separations 2021, 8(3), 25; https://doi.org/10.3390/separations8030025
Available online: https://www.mdpi.com/2297-8739/8/3/25

6. “Adsorption Characteristics of Phosphate Ions by Pristine, CaCl₂ and FeCl₃-Activated Biochars Originated from Tangerine Peels”
by Changgil Son, Wonyeol An, Geonhee Lee, Inho Jeong, Yong-Gu Lee and Kangmin Chon
Separations 2021, 8(3), 32; https://doi.org/10.3390/separations8030032
Available online: https://www.mdpi.com/2297-8739/8/3/32

7. “Ion Mobility–Mass Spectrometry for Bioanalysis”
by Xavier Garcia, Maria del Mar Sabaté, Jorge Aubets, Josep Maria Jansat and Sonia Sentellas
Separations 2021, 8(3), 33; https://doi.org/10.3390/separations8030033
Available online: https://www.mdpi.com/2297-8739/8/3/33

8. “Recent Applications of Solid Phase Microextraction Coupled to Liquid Chromatography”
by Carlo Zambonin and Antonella Aresta
Separations 2021, 8(3), 34; https://doi.org/10.3390/separations8030034
Available online: https://www.mdpi.com/2297-8739/8/3/34

9. “The Use of Ferrofluids in Analytical Sample Preparation: A Review”
by Raúl González-Martín, Adrián Gutiérrez-Serpa and Verónica Pino
Separations 2021, 8(4), 47; https://doi.org/10.3390/separations8040047
Available online: https://www.mdpi.com/2297-8739/8/4/47

10. “Enhanced Adsorption Capacities of Fungicides Using Peanut Shell Biochar via Successive Chemical Modification with KMnO₄ and KOH”
by Yong-Gu Lee, Jaegwan Shin, Jinwoo Kwak, Sangwon Kim, Changgil Son, Geon-Youb Kim, Chang-Ha Lee and Kangmin Chon
Separations 2021, 8(4), 52; https://doi.org/10.3390/separations8040052
Available online: https://www.mdpi.com/2297-8739/8/4/52

11. “Andean Blueberry of the Genus Disterigma: A High-Resolution Mass Spectrometric Approach for the Comprehensive Characterization of Phenolic Compounds”
by Sara Elsa Aita, Anna Laura Capriotti, Chiara Cavaliere, Andrea Cerrato, Benedetta Giannelli Moneta, Carmela Maria Montone, Susy Piovesana and Aldo Laganà
Separations 2021, 8(5), 58; https://doi.org/10.3390/separations8050058
Available online: https://www.mdpi.com/2297-8739/8/5/58

12. “LC-ESI-QTOF-MS/MS Profiling and Antioxidant Activity of Phenolics from Custard Apple Fruit and By-Products”
by Junxi Du, Biming Zhong, Vigasini Subbiah, Colin J. Barrow, Frank R. Dunshea and Hafiz A. R. Suleria
Separations 2021, 8(5), 62; https://doi.org/10.3390/separations8050062
Available online: https://www.mdpi.com/2297-8739/8/5/62

13. “Analytical Methods for Extraction and Identification of Primary and Secondary Metabolites of Apple (Malus domestica) Fruits: A Review”
by Maria Assunta Acquavia, Raffaella Pascale, Luca Foti, Giuseppe Carlucci, Laura Scrano, Giuseppe Martelli, Monica Brienza, Donatella Coviello, Giuliana Bianco and Filomena Lelario
Separations 2021, 8(7), 91; https://doi.org/10.3390/separations8070091
Available online: https://www.mdpi.com/2297-8739/8/7/91

14. “Detailed Group-Type Characterization of Plastic-Waste Pyrolysis Oils: By Comprehensive Two-Dimensional Gas Chromatography Including Linear, Branched, and Di-Olefins”
by Hang Dao Thi, Marko R. Djokic and Kevin M. Van Geem
Separations 2021, 8(7), 103; https://doi.org/10.3390/separations8070103
Available online: https://www.mdpi.com/2297-8739/8/7/103

15. “Quantification of Histidine-Containing Dipeptides in Dolphin Serum Using a Reversed-Phase Ion-Pair High-Performance Liquid Chromatography Method”
by Momochika Kumagai, Sanae Kato, Nanami Arakawa, Mika Otsuka, Takahisa Hamano, Nobuyuki Kashiwagi, Akira Yabuki and Osamu Yamato
Separations 2021, 8(8), 128; https://doi.org/10.3390/separations8080128
Available online: https://www.mdpi.com/2297-8739/8/8/128

16. “Non-Targeted Chemical Characterization of JUUL Virginia Tobacco Flavored Aerosols Using Liquid and Gas Chromatography”
by Mark R. Crosswhite, Patrick C. Bailey, Lena N. Jeong, Anastasia Lioubomirov, Clarissa Yang, Adam Ozvald, J. Brian Jameson and I. Gene Gillman
Separations 2021, 8(9), 130; https://doi.org/10.3390/separations8090130
Available online: https://www.mdpi.com/2297-8739/8/9/130

17. “Magnetic Ionic Liquids in Sample Preparation: Recent Advances and Future Trends”
by Theodoros Chatzimitakos, Phoebe Anagnostou, Ioanna Constantinou, Kalliroi Dakidi and Constantine Stalikas
Separations 2021, 8(9), 153; https://doi.org/10.3390/separations8090153
Available online: https://www.mdpi.com/2297-8739/8/9/153

18. “Designing Safer Solvents to Replace Methylene Chloride for Liquid Chromatography Applications Using Thin-Layer Chromatography as a Screening Tool”
by Apekshya Sharma, Evan Yu, Gregory Morose, David Trung Nguyen and Wan-Ting Chen
Separations 2021, 8(10), 172; https://doi.org/10.3390/separations8100172
Available online: https://www.mdpi.com/2297-8739/8/10/172

19. “Recent Advances on the Development of Chemosensors for the Detection of Mercury Toxicity: A Review”
by Shiva Prasad Kollur, Chandan Shivamallu, Shashanka K. Prasad, Ravindra Veerapur, Sharanagouda S. Patil, Charley A. Cull, Johann F. Coetzee and Raghavendra G. Amachawadi
Separations 2021, 8(10), 192; https://doi.org/10.3390/separations8100192
Available online: https://www.mdpi.com/2297-8739/8/10/192

20. “Development of a New LC-MS/MS Screening Method for Detection of 120 NPS and 43 Drugs in Blood”
by Fabio Vaiano, Elisabetta Bertol, Maria Mineo, Laura Pietrosemoli, Jolanda Rubicondo, Claudiu T. Supuran and Fabrizio Carta
Separations 2021, 8(11), 221; https://doi.org/10.3390/separations8110221
Available online: https://www.mdpi.com/2297-8739/8/11/221

21. “Green Stability Indicating Organic Solvent-Free HPLC Determination of Remdesivir in Substances and Pharmaceutical Dosage Forms”
by Adel Ehab Ibrahim, Sami El Deeb, Emad Mahmoud Abdelhalim, Ahmed Al-Harrasi and Rania Adel Sayed
Separations 2021, 8(12), 243; https://doi.org/10.3390/separations8120243
Available online: https://www.mdpi.com/2297-8739/8/12/243

We would like to take this opportunity to thank all the research groups that submitted these exceptional papers for their contributions to Separations (ISSN: 2297-8739). We would greatly appreciate it if you could circulate this document among your colleagues or through your network.

If you would like to learn more about the contributions published in the “Editor’s Choice Articles”, please click on the following link: https://www.mdpi.com/journal/separations/editors_choice.