scholarly journals Inhibitory Potentials of Hunteria umbellata Seed Extracts on Some Key Enzymes of Diabetes Mellitus with Profiling of its Phenolic Constituents

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Habeeb A. Bankole
Keyword(s):  
Diabetes Mellitus ◽  
Phenolic Compounds ◽  
Kinetic Studies ◽  
Inhibitory Effect ◽  
Sorbitol Dehydrogenase ◽  
Coumaric Acid ◽  
Phenolic Profile ◽  
Ic50 Value ◽  
Phenolic Constituents ◽  
Seed Extracts

Background: The seeds of Hunteria umbellatais a common folkloric plant used in the management of Diabetes mellitus in Nigeria. Though there are many reports on its antidiabetic potential, there is a scarcity of information on its mechanisms of antidiabetic action. This study was designed to investigate the mechanism of antidiabetic action of H. umbellata seed by evaluating the inhibitory effect of its extracts on enzymes that are targeted in the management of diabetes mellitus. Methods: Dried seeds of H. umbellata were powdered and extracted separately in water and ethanol. Alpha-amylase, α-glucosidase, and sorbitol dehydrogenase inhibitory activities of the concentrated extracts were determined spectrophotometrically. Furthermore, the phenolic profile of the seed was determined using HPLC-UV analysis. Results: The inhibitory effect of both ethanol and aqueous extracts H. umbellataon the selected enzymes were similar with IC50 value of 40.36 ± 2.92 and 40.25 ± 4.53 mg/mL for α-amylase, 45.42 ±2.44 and 39.32 ± 3.46 mg/mL for α-glucosidase, and 36.25 ± 2.31 and 32.35 ± 1.53 mg/mL for sorbitol dehydrogenase, respectively. Kinetic studies showed that α-amylase was inhibited competitively, while both α-glucosidase and sorbitol dehydrogenase were inhibited in a non-competitive manner. The phenolic compounds identified in the H. umbellata seed were gallic acid, catechin, p-coumaric acid, rutin, and ferulic acid. Conclusion: The H. umbellata seed extract’s antidiabetic action may be by inhibiting the activities of α-amylase, α-glucosidase, and sorbitol dehydrogenase. This inhibition could be due to the presence of phytochemicals such as phenolic compounds in the plant.

Inhibitory Effect of Garcinia kola Heckel (Clusiacea) Seed Extracts on Some Key Enzymes Linked to Diabetes Mellitus

2015 ◽  
Vol 19 ◽  
pp. 139-144
Author(s):  
AM Zakariya ◽  
UH Danmalam ◽  
AB Sallau ◽  
G Ibrahim ◽  
SM Hassan
Keyword(s):  
Diabetes Mellitus ◽  
Phenolic Compounds ◽  
Ethyl Acetate ◽  
Inhibitory Effect ◽  
Bioactive Constituents ◽  
Porcine Pancreas ◽  
Garcinia Kola ◽  
Soxhlet Apparatus ◽  
Seed Extracts

Enzymes linked with diabetes mellitus and Phytochemical characterization of its bioactive constituents. Crude n-hexane, ethyl acetate and methanol extracts were prepared successively in a soxhlet apparatus at 50ºC. Subsequently, extraction of crude enzymes from porcine pancreas and rat intestine, thin layer chromatographic analysis (TLC), and inhibitory effects of the extracts on b-amylase and b-glucosidase were determined in vitro. The results reveal that G. kola seed extracts inhibited b-amylase (IC50=  4.89 mg/ml, 3.44 mg/ml, 0.78 mg/ml) and b-glucosidase (IC50= 10.29 mg/ml, 1.68 mg/ml, 2.67 mg/ ml) corresponding to n-hexane, ethyl acetate, methanol gradient extracts. n-hexane extract had the highest inhibitory effect on b-amylase, while methanol extract was highest on b-glucosidase. Characterization of the bioactive constituents of the extracts using TLC analysis revealed the presence of steroids/triterpenes and phenolic compounds with phenolic compounds appearing in all extracts irrespective of the solvent polarity used for extraction. Anthraquinone and alkaloids were confirmed absent on TLC. This enzyme inhibition could be one of the possible pathways by which G. kola elicits its antidiabetic properties. Furthermore, the enzyme inhibitory properties of the extracts can be attributed to the presence of steroids/triterpenes, phenolic compounds in the seeds of G. kola.Keywords: Garcinia kola, b-amylase, b-glucosidase, TLC, Inhibitory Effect

scholarly journals Phenolic Constituents from the Heartwood of Artocapus Altilis and their Tyrosinase Inhibitory Activity

2012 ◽  
Vol 7 (2) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Mai Ha Khoa Nguyen ◽  
Hai Xuan Nguyen ◽  
Mai Thanh Thi Nguyen ◽  
Nhan Trung Nguyen
Keyword(s):  
Phenolic Compounds ◽  
Vanillic Acid ◽  
Inhibitory Activity ◽  
Kojic Acid ◽  
Positive Control ◽  
Coumaric Acid ◽  
Meoh Extract ◽  
Tyrosinase Inhibitory Activity ◽  
Phenolic Constituents ◽  
Inhibitory Activities

From the MeOH extract of the heartwood of Artocapus altilis, thirteen phenolic compounds have been isolated, namely curcumin (1), desmethoxycurcumin (2), retrodihydrochalcone (3), apigenin (4), tangeretin (5), nobiletin (6), O-methyldehydrodieugenol (7), dehydrodieugenol (8), β-hydroxypropiovanillone (9), p-coumaric acid (10), p-hydroxybenzaldehyde (11), vanillin (12), and vanillic acid (13). This is the first report on the presence of these compounds in the heartwood of A. altilis. Compounds 1, 2, and 10 showed more potent tyrosinase inhibitory activities, with IC50 values ranging from 2.3 to 42.0 μM, than the positive control kojic acid (IC50, 44.6 μM). The most active compound, p-coumaric acid (10) (IC50, 2.3 μM), was 22 times more active in tyrosinase inhibitory activity than kojic acid.

scholarly journals Impact of Environmental Conditions on Growth and the Phenolic Profile of Achillea atrata L.

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 853
Author(s):  
Lysanne Salomon ◽  
Peter Lorenz ◽  
Bernhard Ehrmann ◽  
Otmar Spring ◽  
Florian C. Stintzing ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Environmental Conditions ◽  
Plant Material ◽  
Acne Vulgaris ◽  
Natural Habitat ◽  
Wild Plants ◽  
Phenolic Profile ◽  
Phenolic Constituents ◽  
A Minor ◽  
Pharmaceutical Production

Achillea atrata L. is a traditionally used medicinal plant. With its pronounced antimicrobial potential, this alpine Achillea species may also be used in modern phytotherapy to treat MRSA infections and prevent dermal infections, such as acne vulgaris. For the present study, A. atrata was cultivated in its natural habitat in Switzerland as well as in Germany to elucidate the potential of standardizing plant material derived from this species for pharmaceutical production. Phytochemical characterization of phenolic constituents by HPLC-DAD-MSn revealed that environmental conditions have only a minor impact on the phenolic profile. Metabolic differences between cultivated and wild plants grown in the same environment suggested the possible existence of genetically derived chemotypes. In total, 28 substances were identified, with marked differences in the occurrence of phenolic compounds observed between flowers and leaves. Moreover, to the best of our knowledge, 7 phenolic compounds have been reported for the first time in A. atrata in the present study. The quantitation of individual constituents revealed their contents to depend on environmental factors and to reach their maximum at increasing altitudes. The results here presented may help to select and cultivate A. atrata plant material with defined and constant compound profiles, which is of particular importance for potential pharmaceutical use.

scholarly journals Phenolic Constituents from Xyloselinum leonidii

2018 ◽  
Vol 13 (11) ◽  
pp. 1934578X1801301
Author(s):  
Nguyen Phuong Hanh ◽  
Nguyen Sinh Khang ◽  
Chu Thi Thu Ha ◽  
Nguyen Quoc Binh ◽  
Nguyen Tien Dat
Keyword(s):  
Nitric Oxide ◽  
Phenolic Compounds ◽  
Inhibitory Effect ◽  
Inflammatory Activity ◽  
Spectroscopic Methods ◽  
Nitric Oxide Production ◽  
First Report ◽  
Phenolic Contents ◽  
Oxide Production ◽  
Phenolic Constituents

One new and seven known phenolic compounds were isolated from the twigs of Xyloselinum leonidii, and identified by means of spectroscopic methods. They were identified to be a new hydroxyaetophenone, xyloselin (1) together with four coumarins decursinol (2), decursinol glucoside (3), pteryxin (4), and praeroside I (5), two chromones angelicain (6), and cimifugin (7), and a flavonoid hesperidin (8). Among the isolated compounds, pteryxin showed the strongest inhibitory effect on the nitric oxide production (IC50 = 17.4 μM) while xyloselin showed weak inhibition. The present paper is the first report on the phenolic contents and the anti-inflammatory activity of the genus Xyloselinum.

Synthesis and Assessment of Novel Anti-chlamydial Benzylidene Acylhydrazides Derivatives

2018 ◽  
Vol 15 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Xiaofeng Bao ◽  
Ying Xue ◽  
Chao Xia ◽  
Yin Lu ◽  
Ningjing Yang ◽  
...  
Keyword(s):  
Inhibitory Effect ◽  
Dependent Manner ◽  
Iron Starvation ◽  
Hydrochloride Salt ◽  
Obligate Intracellular ◽  
Biphasic Life Cycle ◽  
Ic50 Value ◽  
Ic50 Values ◽  
Dose Dependent ◽  
Better Than

Background: Chlamydiae, characterized by a unique biphasic life cycle, are a group of Gram-negative obligate intracellular bacterial pathogens responsible for diseases in a range of hosts including humans. Benzylidene acylhydrazide CF0001 could inhibit chlamydiae independent of iron starvation and T3SS inhibition. This finding promoted us to design and synthesize more benzylidene acylhydrazides to find novel anti-chlamydial agents. Methods: The carboxylic acids 1a-1d were coupled with Boc-hydrazide inpresence of EDCI and DMAP to obtain the intermediate 2a-2d in 60-62% yields. N-Boc deprotections were performed to obtain hydrazide hydrochloride salt 3a-3d. Nextly, the hydrazides were subjected to condensation with aldehydes to obtain benzylidene acylhydrazides 4a-4g in 30-52% yields in two steps. Results: Compound 4d exhibited best inhibitory effect on the formation and growth of chlamydial inclusions. The IC50 value of compound 4d for infectious progenies was 3.55 µM, better than 7.30 µM of CF0001. Conclusion: To find novel anti-chlamydial agents, we have designed and synthesized benzylidene acylhydrazides 4a-4g. Compounds 4a, 4d, 4g showed inhibitory activity on C. muridarum with the IC50 values from 3.55-12 µM. The 3,5-dibromo-4-hydroxyl substitutes on ring B are critical to keep their anti-chlamydial activity. Compound 4d inhibited C. muridarum in a dose-dependent manner without apparent cytotoxicity.

scholarly journals By-Products of Camu-Camu [Myrciaria dubia (Kunth) McVaugh] as Promising Sources of Bioactive High Added-Value Food Ingredients: Functionalization of Yogurts

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 70 ◽  
Author(s):  
Natália Conceição ◽  
Bianca R. Albuquerque ◽  
Carla Pereira ◽  
Rúbia C. G. Corrêa ◽  
Camila B. Lopes ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Phenolic Compounds ◽  
Food System ◽  
Food Additives ◽  
Added Value ◽  
Phenolic Profile ◽  
Food Ingredients ◽  
Myrciaria Dubia ◽  
By Products ◽  
Fruit Part

Camu-camu (Myrciaria dubia (Kunth) McVaugh) is a fruit economically relevant to the Amazon region, mostly consumed in the form of processed pulp. Our aim was to perform an unprecedented comparative study on the chemical composition and bioactivities of the camu-camu pulp and industrial bio-residues (peel and seed), and then the most promising fruit part was further explored as a functionalized ingredient in yogurt. A total of twenty-three phenolic compounds were identified, with myricetin-O-pentoside and cyanindin-3-O-glucoside being the main compounds in peels, followed by p-coumaroyl hexoside in the pulp, and ellagic acid in the seeds. The peel displayed the richest phenolic profile among samples, as well as the most significant antibacterial (MICs = 0.625–10 mg/mL) and anti-proliferative (GI50 = 180 µg/mL against HeLa cells) activities. For this reason, it was selected to be introduced in a food system (yogurt). Taken together, our results suggest the possibility of using the camu-camu peel as a source of food additives.

scholarly journals A Simple Method for Evaluating the Bioactive Phenolic Compounds’ Presence in Brazilian Craft Beers

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4716
Author(s):  
Marcelo Coelho Silva ◽  
Jeancarlo Pereira dos Anjos ◽  
Lilian Lefol Nani Guarieiro ◽  
Bruna A. Souza Machado
Keyword(s):  
Phenolic Compounds ◽  
Caffeic Acid ◽  
Good Accuracy ◽  
Limit Of Detection ◽  
Coumaric Acid ◽  
Simple Method ◽  
Craft Beer ◽  
Extraction Step ◽  
Satisfactory Precision ◽  
Craft Beers

There are a significant number of analytical methodologies employing different techniques to determine phenolic compounds in beverages. However, these methods employ long sample preparation processes and great time consumption. The aim of this paper was the development of a simple method for evaluating the phenolic compounds’ presence in Brazilian craft beers without a previous extraction step. Catechin, caffeic acid, epicatechin, p-coumaric acid, hydrated rutin, trans-ferulic acid, quercetin, kaempferol, and formononetin were analyzed in fifteen different craft beers. The method showed good linearity (R2 ≥ 0.9966). The limit of detection ranged from 0.08 to 0.83 mg L−1, and limits of quantification were between 0.27 and 2.78 mg L−1. The method showed a satisfactory precision (RSD ≤ 16.2%). A good accuracy was obtained by the proposed method for all phenolic compounds in craft beer (68.6% ˂ accuracy ˂ 112%). Catechin showed higher concentrations (up to 124.8 mg L−1) in the samples, followed by epicatechin (up to 51.1 mg L−1) and caffeic acid (up to 8.13 mg L−1). Rutin and formononetin were observed in all analyzed samples (0.52 mg L−1 to 2.40 mg L−1), and kaempferol was less present in the samples. The presence of plant origin products was determinant for the occurrence of the highest concentrations of phenolic compounds in Brazilian craft beers.

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