EVALUATION OF HPLC, PHYTOCHEMICAL, ANTICHOLINESTERASE AND ANTIOXIDANT PROFILES OF THE AERIAL PARTS OF ASPERULA TAURINA SUBSP. CAUCASICA

Abstract

Objective: In this study, we aimed to evaluate the HPLC, phytochemical, anticholinesterase and antioxidant profiles of the aerial parts of Asperula taurina subsp. caucasica.

Material and Method: The fingerprint of the phenolic compounds of the methanolic extract of the plant was obtained using RP-HPLC method. The method was also validated in terms of detection limits, quantification limits, linearity, accuracy, precision and selectivity. The phenolic contents of A. taurina subsp. caucasica were detected as proto-catechuic acid, p-OH benzoic acid and benzoic acid. In the phytochemical studies, quercetin 3-O-β-galactoside was isolated from the ethyl acetate subfraction of A. taurina subsp. caucasica using by several chromatographic methods. The structure of the pure compound was elucidated by means of spectral analysis (1H NMR, 13C NMR, and ESI-MS). Anticholinesterase and antioxidant activity studies were performed on quercetin 3-O-β-galactoside and the methanolic extract of the plant.

Result and Discussion: While quercetin 3-O-β-galactoside shown moderate inhibitory activity against butyrylcholinesterase at 200 μg/ml, quercetin3-O-β-galactoside and the metanolic exract of the plant did not show acetylcholinesterase inhibitory activity. Quercetin 3-O-β-galactoside shown DPPH free radical scavenging activity at 50 and 100 μg/ml, moderate lipid peroxidation inhibitory activity at 25, 50 and 100 μg/ml; the methanolic extract of the plant moderate lipid peroxidation inhibitory activity at 25, 50 and 100 μg/ml. In conclusion, A. taurina subsp. caucasica and quercetin 3-O-β-galactoside could be important and valuable sources for protecting our body health, especially Alzheimer’s disease.

Keywords

• anticholinesterase activity
• antioxidant activity
• Asperula taurina subsp. caucasica
• fingerprint
• HPLC
• quercetin 3-O-β-galactoside
• Rubiaceae

ASPERULA TAURINA SUBSP. CAUCASICA'NIN TOPRAK ÜSTÜ KISIMLARININ YBSK, FİTOKİMYASAL, ANTİKOLİNESTERAZ VE ANTİOKSİDAN PROFİLLERİNİN DEĞERLENDİRİLMESİ

Abstract

Amaç: Bu çalışmada, Asperula taurina subsp. caucasica'nın toprak üstü kısımlarının YBSK, fitokimyasal, antikolinesteraz ve antioksidan profillerinin değerlendirilmesi amaçlanmıştır.

Gereç ve Yöntem: Bitkinin metanolik ekstresinin fenolik bileşiklerinin parmak izi kromatogramı, geliştirilen RP-YBSK yöntemi kullanılarak elde edilmiştir. YBSK yöntemi saptama limitleri, nicelik sınırları, doğrusallık, doğruluk, hassaslık ve seçicilik açısından valide edilmiştir. A. taurina subsp. caucasica fenolik içeriği, protokatekuik asit, p-OH benzoik asit ve benzoik asit olarak tespit edilmiştir. Fitokimyasal çalışmalarda ise, çeşitli kromatografik yöntemler kullanılarak A. taurina subsp. caucasica etil asetat alt fraksiyonundan kersetin 3-O-β-galaktozit izole edilmiştir. Saf bileşiğin yapısı, spektrum analizi (1H NMR, 13C NMR ve ESI-MS) yardımıyla aydınlatılmıştır. Kersetin 3-O-β-galaktozit ve bitkinin metanolik ekstresi üzerinde antikolinesteraz ve antioksidan aktivite çalışmaları yapılmıştır.

Sonuç ve Tartışma: Kersetin 3-O-β-galaktozit, butirilkolinesteraz'a karşı 200 μg/ml'de orta düzeyde inhibe edici aktivite gösterirken, kersetin 3-O-β-galaktozit ve bitkinin metanolik ekstresi asetilkolinesteraz inhibitör etki göstermemiştir. Kersetin 3-O-β-galaktozit, 50 ve 100 μg/ml'de DPPH serbest radikal süpürücü aktivite, 25, 50 ve 100 μg/ml'de orta derecede lipit peroksidasyon inhibisyon aktivitesi gösterirken; bitkinin metanolik ekstresi 25, 50 ve 100 μg/ml'de orta düzeyde lipit peroksidasyonu önleyici aktivite göstermiştir. Sonuç olarak, A. taurina subsp. caucasica ve kersetin 3-O-β-galaktozit, özellikle Alzheimer hastalığından korunmada önemli ve değerli bir doğal ürün kaynağı olabilir.

Keywords

• antikolinesteraz aktivite
• antioksidan aktivite
• Asperula taurina subsp. caucasica
• kersetin 3-O-β-galaktozit
• parmak izi
• Rubiaceae
• YBSK

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