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    Bioactive properties of powdered peppermint and spearmint extracts: Inhibition of key enzymes linked to hypertension and type 2 diabetes
    (Elsevier, 2020) Cam, Mustafa; Basyigit, Bulent; Alasalvar, Hamza; Yilmaztekin, Murat; Ahhmed, Abdulatef; Sagdic, Osman; Konca, Yusuf
    Peppermint and spearmint, both members of the Lamiaceae family, have been used in the form of extracts, infusions, and decoctions, because of their health benefits. Consumers are looking for functional food products which not only provide health benefits but also necessitate less preparation time. Therefore, this study aimed to investigate the bioactive properties of powdered peppermint and spearmint extracts. Peppermint and spearmint extracts obtained using pressurized water extraction were made into powder forms with a spray dryer using the air inlet temperature of 140 degrees C. Powdered peppermint extract (PPE) and powdered spearmint extract (PSE) showed significant inhibition against key enzymes of type 2 diabetes (alpha-glucosidase) and hypertension (angiotensin 1-converting enzyme, ACE). Alpha glucosidase inhibition degree of PPE and PSE as IC50 values was 0.6 and 1.2 mg/mL, respectively, while IC50 values for the ACE inhibition test were 4.5 mg for PPE and 5.8 mg for PSE. The HPLC-DAD method for ACE inhibition activity showed the suitability of this method for plant extracts high in phenolics which had no interference effects on the results. There were no differences between PPE and PSE in the DPPH test. However, PPE had higher Trolox equivalent antioxidant capacity (190 mg/g) with the ABTS test than PSE (170 mg/g). The predominant phenolics of PPE and PSE were found to be eriocitrin (47 mg/g) and rosmarinic acid (27 mg/g), respectively.
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    Characterization, in vitro release, and antioxidant activity of glutenin hydrolysate encapsulated in liposome-loaded uni-axial and co-axial electrospun fibers
    (Wiley, 2026) Kalintas Caglar, Nagihan; Caglar, Ahmet Furkan; Bozkurt, Fatih; Izciler, Feyzanur; Sagdic, Osman; Karakas, Canan Yagmur; Karadag, Ayse
    BACKGROUND Bioactive peptides derived from protein hydrolysates provide various health benefits; however, their practical application is limited by low gastrointestinal stability, enzymatic degradation, and poor intestinal absorption. Overcoming these challenges remains a key bottleneck for oral peptide delivery. This study aimed to develop and systematically compare uni-axial and co-axial electrospun pullulan/carboxymethylcellulose fibers incorporating liposome-encapsulated glutenin hydrolysate (GH) to enhance its stability, mucoadhesion, and controlled release along the gastrointestinal system.RESULTS GH (7.5 mg mL-1) was encapsulated into lecithin-phytosterol (1:0.5, w/w) liposomes, yielding an average size of 76 nm and an encapsulation efficiency of 57.52%. These liposomes were successfully embedded into nanofibers, showing homogeneous distribution and GH loading efficiencies of 61.04-85.22%. Compared with free GH, liposomal systems preserved the antioxidant activity (ABTS and FRAP values) of GH during gastrointestinal digestion, while the non-hybrid formulation demonstrated reduced preservation. Liposome-loaded nanofibers exhibited markedly lower GH release under gastric conditions (21.05-25.85%) than free-GH fibers (42.69%), while co-axial fibers provided the most sustained intestinal release. Additionally, liposomal incorporation significantly enhanced mucoadhesive properties.CONCLUSION The hybrid liposome-nanofiber approach integrates protective and controlled-delivery mechanisms, resulting in enhanced preservation of antioxidant activity and sustained release compared with conventional fibers. This food-grade strategy shows strong potential for oral delivery of bioactive peptides in functional food and nutraceutical applications requiring gastrointestinal stability.