We are pleased to share the 10 most cited papers published in Separations (ISSN: 2297-8739) in 2021:

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. “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

3. “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

4. “Advanced Analytical Approaches for the Analysis of Polyphenols in Plants Matrices—A Review”
by Elena Roxana Chiriac, Carmen Lidia Chiţescu, Elisabeta-Irina Geană, Cerasela Elena Gird, Radu Petre Socoteanu and Rica Boscencu
Separations 2021, 8(5), 65; https://doi.org/10.3390/separations8050065
Available online: https://www.mdpi.com/2297-8739/8/5/65

5. “A Review on the Nanofiltration Process for Treating Wastewaters from the Petroleum Industry”
by Shahryar Jafarinejad and Milad Rabbani Esfahani
Separations 2021, 8(11), 206; https://doi.org/10.3390/separations8110206
Available online: https://www.mdpi.com/2297-8739/8/11/206

6. “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

7. “Experimental and Theoretical Research on Pressure Drop Changes in a Two-Stage Air Filter Used in Tracked Vehicle Engine”
by Tadeusz Dziubak and Grzegorz Boruta
Separations 2021, 8(6), 71; https://doi.org/10.3390/separations8060071
Available online: https://www.mdpi.com/2297-8739/8/6/71

8. “Characterization of Quercetin Derivatives in Crossing Combination of Habanero White and Capsicum annuum Peppers and of Anti-Inflammatory and Cytotoxic Activity”
by Maria Assunta Acquavia, Raffaella Pascale, Ilaria Pappalardo, Anna Santarsiero, Giuseppe Martelli and Giuliana Bianco
Separations 2021, 8(7), 90; https://doi.org/10.3390/separations8070090
Available online: https://www.mdpi.com/2297-8739/8/7/90

9. “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