Person: EMRE, GİZEM
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EMRE
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GİZEM
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Publication Open Access A comparative exploration of the phytochemical profiles and bio-pharmaceutical potential of Helichrysum stoechas subsp. barrelieri extracts obtained via five extraction techniques(ELSEVIER SCI LTD, 2020-04) EMRE, GİZEM; Zengin, Gokhan; Cvetanovic, Aleksandra; Gasic, Uros; Tesic, Zivoslav; Stupar, Alena; Bulut, Gizem; Sinan, Kouadio Ibrahime; Uysal, Sengul; Picot-Allain, Marie Carene Nancy; Mahomoodally, Mohamad FawziWe endeavoured to probe into and compare the possible effect(s) of different extraction techniques (accelerated solvent extraction (ASE), microwave-assisted extraction (MAE), ultrasonication-assisted extraction (UAE), maceration, and Soxhlet extraction (SE)) on the bioactivity (antioxidant and enzyme inhibitory activities) of the aerial parts of Helichrysum stoechas subsp. barrelieri (Ten.) Nyman. Total phenolic and flavonoid contents of the extracts obtained by different extraction methods followed the order of ASE > MAE > UAE > maceration > SE. Extract obtained by ASE was the most potent radical scavenger (219.92 and 313.12 mg Trolox equivalent [FE]/g, against 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS), respectively) and reducing agent (927.39 and 662.87 mg TE/g, for cupric reducing antioxidant capacity (CUPRAC) and ferric reducing antioxidant power (FRAP), respectively). Helichrysum stoechas extract obtained by UAE (18.67 mg ethylenediaminetetraacetic equivalent [EDTAE]/g) was the most active metal chelator and inhibitor of acetylcholinesterase (4.23 mg galantamine equivalent [GALAE]/g) and butyrylcholinesterase (6.05 mg GALAE/g) cholinesterase. Extract from maceration (183.32 mg kojic acid equivalent [KAE]/g) was most active against tyrosinase while ASE extract (1.66 mmol acarbose equivalent [ACAE]/g) effectively inhibited alpha-glucosidase. In conclusion, data amassed herein tend to advocate for the use of non-conventional extraction techniques, namely ASE and UAE, for the extraction of bioactive secondary metabolites from H. stoechas aerial parts.Publication Metadata only Chemical composition and bio-functional perspectives of Erica arborea L. extracts obtained by different extraction techniques: Innovative insights(ELSEVIER, 2019) DOĞAN, AHMET; Zengin, Gokhan; Cvetanovic, Aleksandra; Gasic, Uros; Stupar, Alena; Bulut, Gizem; Senkardes, Ismail; Dogan, Ahmet; Seebaluck-Sandoram, Roumita; Rengasamy, Kannan R. R.; Sinan, Kouadio Ibrahime; Mahomoodally, Mohamad FawziErica arborea L., also known as Estrella Gold, is traditionally used for several purposes. In this research, five different extraction techniques: accelerated solvent extraction (ASE), microwave-assisted extraction (MAE), maceration (MAC), soxhlet (SOE) and ultrasound-assisted extraction (UAE) were used to compare the total phenolic, flavonoids, total antioxidant activity and enzymatic activities of E. arborea extracts obtained different extraction techniques. The total phenolic and flavonoid contents were in the order of ASE > MAE > SOE > MAC > UAE. All extracts showed antioxidant, anticholinesterase, anti-tyrosinase and anti-diabetic activities. A highly sensitive method using ultra-high-pressure liquid chromatography coupled with linear ion trap-Orbitrap tandem mass spectrometry (UHPLC-LTQ-Orbitrap-MS) has been used for the qualitative analysis of obtained extracts. Seventy-two polyphenolic compounds were identified in all extracts. However, 20 components were quantified among the extracts. ASE was found to be a better extraction technique as compared to the other extraction techniques. E. arborea can be exploited in the discovery of bioactive natural products for the treatment of Alzheimer's disease, diabetes and pigmentation problems.Publication Metadata only HPLC-MS/MS-based metabolic profiling and pharmacological properties of extracts and infusion obtained from Amelanchier parviflora var. dentata(ELSEVIER SCIENCE BV, 2018) DOĞAN, AHMET; Zengin, Gokhan; Diuzheva, Alina; Jeko, Jozsef; Cziaky, Zoltan; Bulut, Gizem; Dogan, Ahmet; Haznedaroglu, Mehmet Zeki; Rengasamy, Kannan R. R.; Lobine, Devina; Bahadori, Mir Babak; Mahomoodally, Mohamad FawziArnelanchierparviflora var. dentata is an endemic medicinal plant traditionally consumed to treat stomach pain, cardiovascular diseases, and urinary tract infections in Turkey's folk medicine. Although Amelanchier genus is an excellent source of phytochemicals with a panoply of biological activities, no report has been made available on Amelanchier parviflora var. dentata. Thus, the metabolic profiles of methanol, ethyl acetate, and water extracts were obtained using HPLC-MS/MS. Besides, the pharmacological properties such as antioxidant activity and enzyme inhibition effects against acetyl/butyrylcholinesterase, tyrosinase, alpha-amylase, and alpha-glucosidase were evaluated. In total, 62, 38, and 16 metabolites were Identified from the methanolic, water, and ethyl acetate extracts, respectively. The identified metabolites belong to anthocyanins, phenolic acids, and flavonoids. The tested extracts exhibited different enzyme inhibitory activity against cholinesterases (acetylcholinesterase: 0.52-2.47 mg GEs/g extract and butyrylcholinesterase: 0.47-3.59 mg GEs/g extract), tyrosinase (19,0-145.54 mg KAEs/g extract), alpha-amylase (0.23-1.10 mmol ACEs/g extract), and alpha-glucosidase (8.89-9.92 mmol ACEs/ g extract). Evidence from the present study supports the necessity for more research in an endeavor to discover biologically active secondary metabolites from A. parviflora to manage specific ailments.Publication Metadata only Biologically active compounds from two members of the Asteraceae family: Tragopogon dubius Scop. and Tussilago farfara L.(TAYLOR & FRANCIS INC, 2019) DOĞAN, AHMET; Uysal, Sengul; Senkardes, Ismail; Mollica, Adriano; Zengin, Gokhan; Bulut, Gizem; Dogan, Ahmet; Glamoclija, Jasmina; Sokovic, Marina; Lobine, Devina; Mahomoodally, Fawzi M.Tragopogon dubius and Tussilago farfara are consumed as vegetables and used in folk medicine to manage common diseases. Herein, the chemical compositions and biological activities of different leaf extracts (ethyl acetate, methanol, and water) of T. dubius and T. farfara were evaluated. The antibacterial, antifungal, and antioxidant abilities of the extracts were tested using different assays including free radical scavenging, reducing power, phosphomolybdenum, and metal chelating assays. Enzyme inhibitory potentials were evaluated against cholinesterases, tyrosinase, alpha-amylase and alpha-glucosidase. Complexes of bioactive compounds (chlorogenic and rosmarinic acid) were docked into the enzymatic cavity of alpha-glucosidase and subjected to molecular dynamic calculation, enzyme conformational stability, and flexibility analysis. T. dubius and T. farfara extracts showed remarkable antioxidant potentials. Ethyl acetate extracts of T. dubius and T. farfara were the most potent inhibitors of acetylcholinesterase and butyrylcholinesterase. T. dubius ethyl acetate extract and T. farfara methanolic extract showed noteworthy activity against alpha-glucosidase. High performance liquid chromatography analysis revealed the abundance of some phenolic compounds including chlorogenic and rosmarinic acids. Ethyl acetate extract of T. dubius showed notable antifungal activity against all strains. Docking studies showed best pose for chlorogenic acid was stabilized by a network of hydrogen bonds with residues Asp1157, Asp1279, whereas rosmarinic acid showed several hydrogen bonds with Asp1157, Asp1420, Asp1526, Lys1460 and Trp1369. This study further validates the use of T. dubius and T. farfara in traditional medicine, as well as act as a stimulus for further studies for future biomedicine development. Communicated by Ramaswamy H. Sarma