Mehmet Ay | Canakkale Onsekiz Mart University (original) (raw)
Books by Mehmet Ay
Papers by Mehmet Ay
International Immunopharmacology, Feb 1, 2017
The design of novel drugs for pain relief with improved analgesic properties and diminished side ... more The design of novel drugs for pain relief with improved analgesic properties and diminished side effect induction profile still remains a challenging pursuit. Tolerance is one of the most burdensome phenomena that may hamper ongoing opioid therapy, especially in chronic pain patients. Therefore, a promising strategy of hybridizing two pharmacophores that target distinct binding sites involved in pain modulation and transmission was established. Previous studies have led to the development of opioid agonist/NK1 agonist hybrids that produce sufficient analgesia and also suppress opioid-induced tolerance development. In our present investigation we assessed the antinociceptive potency of a new AA3052 chimera comprised of a potent MOR selective dermorphine derivative (DALDA) and an NK1 agonist, a stabilized substance P analogue. We have shown that AA3052 significantly prolonged responses to both mechanical and noxious thermal stimuli in rats after intracerebroventricular administration. Additionally, AA3052 did not trigger the development of tolerance in a 6day daily injection paradigm nor did it produce any sedative effects, as assessed in the rotarod performance test. However, the antinociceptive effect of AA3052 was independent of opioid receptor stimulation by the DALDA pharmacophore as shown in the agonist-stimulated Gprotein assay. Altogether the current results confirm the antinociceptive effectiveness of a novel opioid/SP hybrid agonist, AA3052, and more importantly its ability to inhibit the development of tolerance.
International Journal of Biological Macromolecules, Apr 1, 2019
Porous and biodegradable hyaluronic acid (HA) nanogel and their copolymeric forms with sucrose (S... more Porous and biodegradable hyaluronic acid (HA) nanogel and their copolymeric forms with sucrose (Suc), HA:Sucrose (HA:Suc) nanogels, were synthesized by employing glycerol diglycidyl ether (GDE) as crosslinker with a single step reaction in surfactant-free medium. The size of the nanogels was determined as 150 ± 50 nm in dried state from SEM images and found to increase to about 540 ± 47 nm in DI water measured with DLS measurements. The surface areas of HA and HA:Suc nanogels were measured as 18.07 ± 2.4 and 32.30 ± 6.1 m 2 /g with porosities of 3.58 ± 1.8, and 9.44 ± 3.1 nm via BET analysis, respectively. The zeta potentials for HA and HA:Suc nanogels were measured as −33 ± 1.4 and − 30 ± 1.2 mV, respectively. The thermal degradation of both types of nanogels revealed similar trends, while hydrolytic degradation of the nanogels was about 22.7 ± 0.2 wt% in 15 days. Both HA and HA:Suc nanogels were stable in blood up to 250 μg/mL concentration with approximately 0.5 ± 0.1% hemolysis ratio and 76 ± 12% blood clotting indices, respectively. Finally, these nanogels were used as a sustained slow-release or long-term delivery system over 2 days for a hydrophobic cancer drug, 3-((E)-3-(4-hydroxyphenyl)acryloyl)-2H-chromen-2-on (A #) established by our group. The nanogels successfully delivered the model drug A at 10.43 ± 2.12 mg/g for 2 days.
Bioorganic & Medicinal Chemistry Letters, Aug 1, 2016
The use of existing antibiotics in the form of prodrug followed by activation using enzymes of pa... more The use of existing antibiotics in the form of prodrug followed by activation using enzymes of pathogenic origin could be a useful approach for antimicrobial therapy. To investigate this idea, a common antibiotic, sulfamethoxazole has been redesigned in the form of a prodrug by simple functional group replacement. Upon reductive activation by a type I nitroreductase from a pathogen, the drug displayed enhanced antimicrobial capacity. This strategy could improve the efficacy and selectively of antibiotics and reduce the incidence of resistance.
DergiPark (Istanbul University), Jun 1, 2018
Voltammetric behaviors of six nitro-substituted benzamides, which are potential prodrug candidate... more Voltammetric behaviors of six nitro-substituted benzamides, which are potential prodrug candidates for nitroreductase-based cancer therapy, were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The electrochemical behavior of aromatic nitro (ArNO 2) compounds by CV indicates that compounds involve various reduction/oxidation steps including the formation of aromatic nitro radical, nitroso, hydroxylamine, and amine groups. Applicability of the voltammetric determination of these prodrug candidates was studied by recording their DPVs, carried out in mixed media (Britton Robinson buffer solution + DMF) at various pH values on a pencil graphite electrode (PGE). Results show that the PGE can offer a disposable, low-cost, and sensitive electrochemical determination method for identifying nitro benzamide compounds. Under the experimental conditions, the PGE had a linear response range from 0.5 to 100 µ M 4-nitro-N-(2-nitrophenyl)benzamide (compound 2). This voltammetric procedure indicates that nitro-substituted benzamide drugs can be successfully determined in pharmaceutical samples.
RSC Medicinal Chemistry
Eukaryotic elongation factor 2 kinase (eEF2K) has been shown to be an important molecular driver ... more Eukaryotic elongation factor 2 kinase (eEF2K) has been shown to be an important molecular driver of tumorigenesis and validated as a potential novel molecular target in various solid cancers including triple negative breast cancer (TNBC).
Ankara: Ankara Üniversitesi Fen Fakültesi, 1998
ChemistrySelect, Jul 1, 2021
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
European journal of medicinal chemistry, Feb 1, 2020
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
Medicinal Chemistry, Jul 6, 2018
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
European journal of medicinal chemistry, Jun 1, 2019
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
TURKISH JOURNAL OF CHEMISTRY, 2019
A series of sulfonamide derivatives were synthesized by reactions with various functional groups ... more A series of sulfonamide derivatives were synthesized by reactions with various functional groups containing benzenesulfonyl chlorides and aniline derivatives under different substitution reaction conditions. The structures of SMZ derivatives were confirmed with melting point, FT-IR, 1 H NMR, 13 C NMR, and LC-MS/MS techniques. In order to investigate the cytotoxic effects of these derivatives, we used a model plant species. The synthesized compounds (S1-S5) and sulfamethazine (SMZ) as a positive control were applied to Arabidopsis thaliana seeds. Our results indicated that S3 and S4 induced shorter roots and lower wet weight in plants. Plants treated with S2 and S5 showed no growth effects, similar to the untreated control group, while S1 slightly reduced root length and wet weight. These results suggest that S3 and the newly synthesized S4 derivatives have potential for use as herbicides since they possess cytotoxic effects on A. thaliana plants.
Pharmaceutical Sciences
In recent years, the incidence of cancers, inflammatory diseases, Alzheimer’s disease, glucose me... more In recent years, the incidence of cancers, inflammatory diseases, Alzheimer’s disease, glucose metabolism disorder and diabetes has increased alarmingly which demands more research into the discovery of new drug candidates to treat these human diseases. Main phytochemicals from Humulus lupulus L. (hops) have been demonstrated to have positive impacts on human health, and prenylated flavonoids are one of the major groups of bioactive phytochemicals found in this plant. Thus, this review summarizes the role of major prenylated components in hops in human diseases including cancer, inflammation and viral infections. In silico studies of prenylated bioactive compounds against various drug targets such as histone deactylases (HDACs), sirtuins (SIRTs), and acetylcholinesterase (AChE), and the molecular molecular interactions between protein and ligand have also been included. Furthermore, the structure-activity relationships (SAR) studies on these compounds are highlighted. This review co...
International Journal of Life Sciences and Biotechnology, 2021
Natural products have a key role for drug discovery in pharmacology and medicine. Prunus spinosa ... more Natural products have a key role for drug discovery in pharmacology and medicine. Prunus spinosa L. (blackthorn) grown in Çanakkale province in western Turkey, is known as a medicinal plant, a rich source of biologically active compounds such as phenolics, flavonoids and anthocyanidins. The flower and fruit extracts of the plant are subjects of many studies, but they usually lack details of its potential for bio-inhibition studies. Thus, this study aimed to investigate the antioxidant, enzyme inhibition and antiproliferative activity studies of the methanol, ethyl acetate, dichloromethane, and n-hexane extracts of the plant. The ethyl acetate and methanol extracts showed better antioxidant activity with DPPH, FRAP, CUPRAC, and TEAC assays. Enzyme inhibition studies of the extracts were performed using β-lactamase, proteases and tyrosinase. The methanol (FL) and ethyl acetate (FL and L) extracts at the concentration of 10 mg/mL, displayed better inhibition against α-chymotrypsin, trypsin, and papain with values of 22.6%, 34.7% and 92.1%, respectively. Furthermore, the methanol and ethyl acetate extracts have displayed higher cytotoxic effect against cancer cells such as Hep3B and HT29 compared to healthy cells (HUVEC) using MTT assay. The findings suggest that P. spinosa L. extracts and their components may be potential for further investigations of novel drug candidates from natural sources.
International Immunopharmacology, Feb 1, 2017
The design of novel drugs for pain relief with improved analgesic properties and diminished side ... more The design of novel drugs for pain relief with improved analgesic properties and diminished side effect induction profile still remains a challenging pursuit. Tolerance is one of the most burdensome phenomena that may hamper ongoing opioid therapy, especially in chronic pain patients. Therefore, a promising strategy of hybridizing two pharmacophores that target distinct binding sites involved in pain modulation and transmission was established. Previous studies have led to the development of opioid agonist/NK1 agonist hybrids that produce sufficient analgesia and also suppress opioid-induced tolerance development. In our present investigation we assessed the antinociceptive potency of a new AA3052 chimera comprised of a potent MOR selective dermorphine derivative (DALDA) and an NK1 agonist, a stabilized substance P analogue. We have shown that AA3052 significantly prolonged responses to both mechanical and noxious thermal stimuli in rats after intracerebroventricular administration. Additionally, AA3052 did not trigger the development of tolerance in a 6day daily injection paradigm nor did it produce any sedative effects, as assessed in the rotarod performance test. However, the antinociceptive effect of AA3052 was independent of opioid receptor stimulation by the DALDA pharmacophore as shown in the agonist-stimulated Gprotein assay. Altogether the current results confirm the antinociceptive effectiveness of a novel opioid/SP hybrid agonist, AA3052, and more importantly its ability to inhibit the development of tolerance.
International Journal of Biological Macromolecules, Apr 1, 2019
Porous and biodegradable hyaluronic acid (HA) nanogel and their copolymeric forms with sucrose (S... more Porous and biodegradable hyaluronic acid (HA) nanogel and their copolymeric forms with sucrose (Suc), HA:Sucrose (HA:Suc) nanogels, were synthesized by employing glycerol diglycidyl ether (GDE) as crosslinker with a single step reaction in surfactant-free medium. The size of the nanogels was determined as 150 ± 50 nm in dried state from SEM images and found to increase to about 540 ± 47 nm in DI water measured with DLS measurements. The surface areas of HA and HA:Suc nanogels were measured as 18.07 ± 2.4 and 32.30 ± 6.1 m 2 /g with porosities of 3.58 ± 1.8, and 9.44 ± 3.1 nm via BET analysis, respectively. The zeta potentials for HA and HA:Suc nanogels were measured as −33 ± 1.4 and − 30 ± 1.2 mV, respectively. The thermal degradation of both types of nanogels revealed similar trends, while hydrolytic degradation of the nanogels was about 22.7 ± 0.2 wt% in 15 days. Both HA and HA:Suc nanogels were stable in blood up to 250 μg/mL concentration with approximately 0.5 ± 0.1% hemolysis ratio and 76 ± 12% blood clotting indices, respectively. Finally, these nanogels were used as a sustained slow-release or long-term delivery system over 2 days for a hydrophobic cancer drug, 3-((E)-3-(4-hydroxyphenyl)acryloyl)-2H-chromen-2-on (A #) established by our group. The nanogels successfully delivered the model drug A at 10.43 ± 2.12 mg/g for 2 days.
Bioorganic & Medicinal Chemistry Letters, Aug 1, 2016
The use of existing antibiotics in the form of prodrug followed by activation using enzymes of pa... more The use of existing antibiotics in the form of prodrug followed by activation using enzymes of pathogenic origin could be a useful approach for antimicrobial therapy. To investigate this idea, a common antibiotic, sulfamethoxazole has been redesigned in the form of a prodrug by simple functional group replacement. Upon reductive activation by a type I nitroreductase from a pathogen, the drug displayed enhanced antimicrobial capacity. This strategy could improve the efficacy and selectively of antibiotics and reduce the incidence of resistance.
DergiPark (Istanbul University), Jun 1, 2018
Voltammetric behaviors of six nitro-substituted benzamides, which are potential prodrug candidate... more Voltammetric behaviors of six nitro-substituted benzamides, which are potential prodrug candidates for nitroreductase-based cancer therapy, were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The electrochemical behavior of aromatic nitro (ArNO 2) compounds by CV indicates that compounds involve various reduction/oxidation steps including the formation of aromatic nitro radical, nitroso, hydroxylamine, and amine groups. Applicability of the voltammetric determination of these prodrug candidates was studied by recording their DPVs, carried out in mixed media (Britton Robinson buffer solution + DMF) at various pH values on a pencil graphite electrode (PGE). Results show that the PGE can offer a disposable, low-cost, and sensitive electrochemical determination method for identifying nitro benzamide compounds. Under the experimental conditions, the PGE had a linear response range from 0.5 to 100 µ M 4-nitro-N-(2-nitrophenyl)benzamide (compound 2). This voltammetric procedure indicates that nitro-substituted benzamide drugs can be successfully determined in pharmaceutical samples.
RSC Medicinal Chemistry
Eukaryotic elongation factor 2 kinase (eEF2K) has been shown to be an important molecular driver ... more Eukaryotic elongation factor 2 kinase (eEF2K) has been shown to be an important molecular driver of tumorigenesis and validated as a potential novel molecular target in various solid cancers including triple negative breast cancer (TNBC).
Ankara: Ankara Üniversitesi Fen Fakültesi, 1998
ChemistrySelect, Jul 1, 2021
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
European journal of medicinal chemistry, Feb 1, 2020
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
Medicinal Chemistry, Jul 6, 2018
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
European journal of medicinal chemistry, Jun 1, 2019
The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H ... more The use of nitroreductases (NTR) that catalyze the reduction of nitro compounds by using NAD(P)H in GDEPT (Gene-directed enzyme prodrug therapy) studies which minimize toxicity at healthy cells and increases concentration of drugs at cancer cells is remarkable. Discovery of new prodrug/NTR combinations is necessary to be an alternative to known prodrug candidates such as CB1954, SN23862, PR-104A. For this aim, nitro containing aromatic amides (A1-A23) ≠ ≠ ≠ ≠ were designed, synthesized, performed in silico ADMET and molecular docking techniques in this study. Prodrug candidates were studied on reduction potentials with Ssap-NtrB by HPLC system. Also, cyototoxic properties and prodrug ability of these amides were investigated using different cancer cell lines such as Hep3B and PC3. As a result of theoretical and biological studies, combinations of A5, A6 and A20 with Ssap-NtrB can be suggested as potential prodrugs/enzyme combinations at NTR based cancer therapy compared with CB1954/NfsB.
TURKISH JOURNAL OF CHEMISTRY, 2019
A series of sulfonamide derivatives were synthesized by reactions with various functional groups ... more A series of sulfonamide derivatives were synthesized by reactions with various functional groups containing benzenesulfonyl chlorides and aniline derivatives under different substitution reaction conditions. The structures of SMZ derivatives were confirmed with melting point, FT-IR, 1 H NMR, 13 C NMR, and LC-MS/MS techniques. In order to investigate the cytotoxic effects of these derivatives, we used a model plant species. The synthesized compounds (S1-S5) and sulfamethazine (SMZ) as a positive control were applied to Arabidopsis thaliana seeds. Our results indicated that S3 and S4 induced shorter roots and lower wet weight in plants. Plants treated with S2 and S5 showed no growth effects, similar to the untreated control group, while S1 slightly reduced root length and wet weight. These results suggest that S3 and the newly synthesized S4 derivatives have potential for use as herbicides since they possess cytotoxic effects on A. thaliana plants.
Pharmaceutical Sciences
In recent years, the incidence of cancers, inflammatory diseases, Alzheimer’s disease, glucose me... more In recent years, the incidence of cancers, inflammatory diseases, Alzheimer’s disease, glucose metabolism disorder and diabetes has increased alarmingly which demands more research into the discovery of new drug candidates to treat these human diseases. Main phytochemicals from Humulus lupulus L. (hops) have been demonstrated to have positive impacts on human health, and prenylated flavonoids are one of the major groups of bioactive phytochemicals found in this plant. Thus, this review summarizes the role of major prenylated components in hops in human diseases including cancer, inflammation and viral infections. In silico studies of prenylated bioactive compounds against various drug targets such as histone deactylases (HDACs), sirtuins (SIRTs), and acetylcholinesterase (AChE), and the molecular molecular interactions between protein and ligand have also been included. Furthermore, the structure-activity relationships (SAR) studies on these compounds are highlighted. This review co...
International Journal of Life Sciences and Biotechnology, 2021
Natural products have a key role for drug discovery in pharmacology and medicine. Prunus spinosa ... more Natural products have a key role for drug discovery in pharmacology and medicine. Prunus spinosa L. (blackthorn) grown in Çanakkale province in western Turkey, is known as a medicinal plant, a rich source of biologically active compounds such as phenolics, flavonoids and anthocyanidins. The flower and fruit extracts of the plant are subjects of many studies, but they usually lack details of its potential for bio-inhibition studies. Thus, this study aimed to investigate the antioxidant, enzyme inhibition and antiproliferative activity studies of the methanol, ethyl acetate, dichloromethane, and n-hexane extracts of the plant. The ethyl acetate and methanol extracts showed better antioxidant activity with DPPH, FRAP, CUPRAC, and TEAC assays. Enzyme inhibition studies of the extracts were performed using β-lactamase, proteases and tyrosinase. The methanol (FL) and ethyl acetate (FL and L) extracts at the concentration of 10 mg/mL, displayed better inhibition against α-chymotrypsin, trypsin, and papain with values of 22.6%, 34.7% and 92.1%, respectively. Furthermore, the methanol and ethyl acetate extracts have displayed higher cytotoxic effect against cancer cells such as Hep3B and HT29 compared to healthy cells (HUVEC) using MTT assay. The findings suggest that P. spinosa L. extracts and their components may be potential for further investigations of novel drug candidates from natural sources.
Journal of Molecular Graphics and Modelling
Çanakkale Onsekiz Mart Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020
Brassicaceae that contains well known species from genus Brassica is an important family for cruc... more Brassicaceae that contains well known species from genus Brassica is an important family for crucifers, cabbage etc. The main goal of this study was to investigate the total phenolic contents and antioxidant activities of 25% aqueous ethanol and methanol extracts of selected vegetable pulps such as radish, cabbage, and cauliflower. These analyses were also applied to the freshly prepared juices. For this purpose, studied vegetables which were grown in villages of Canakkale were obtained from district bazaar in Canakkale. Antioxidant activities of selected vegetables have been determined by using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) free radical, ABTS ((2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging assay and CUPRAC (cupric reducing antioxidant capacity) method. Total phenolic content was determined by using Folin-Ciocalteu reagent. The results show that total phenolic contents in pulp extracts of 25% aqueous ethanol of red cabbage (1071 ± 25.12 mg FAE/100 g) and brussels sprout (594.00 ± 13.93 mg FAE/100 g) have higher than the other used vegetables. The 25% aqueous ethanol extracts of white and red radish pulps showed the greatest IC50 value with DPPH assay (50.00 µg/mL). The higher phenolic content in the ethanol and methanol extracts of red cabbage may contribute to its increasing CUPRAC activity (4.73 ± 0.11 and 4.78 ± 0.11 quercetin equivalent of flavonoid concentration). In addition, black radish juice showed the highest inhibition value with ABTS assay (70.83 ± 1.83%). This study which may be important for food and health applications, also emphasizes the importance of the cultivation area and the valuable parts of vegetables.
Natural Product Research, 2008
Reversed-phase HPLC analyses of the methanol extract of the leaves of Erica arborea afforded a no... more Reversed-phase HPLC analyses of the methanol extract of the leaves of Erica arborea afforded a novel phenylpropanoid glucoside, named ericarborin, together with five flavonoids, dihydromyricetin 3-O-alpha-L-rhamnopyranoside, quercetin 3-O-beta-D-glucopyranoside, quercetin 3-O-alpha-L-rhamnopyranoside, apigenin 7-O-beta-D-glucopyranoside and apigenin 7-O-beta-D-(6-O-acetyl-glucopyranoside). While the structure of ericarborin was determined by extensive 1D and 2D NMR analyses, the structures of all known flavonoids were determined by direct comparison of their spectroscopic data with respective literature data. The antioxidant properties of these compounds were assessed by the DPPH assay. The chemotaxonomic significance of these phenolic compounds has been discussed.