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Guava leaves polyphenolics-rich extract inhibits vital enzymes implicated in gout and hypertension in vitro.

Irondi EA, Agboola SO, Oboh G, Boligon AA, Athayde ML, Shode FO - J Intercult Ethnopharmacol (2016)

Bottom Line: Hence, this study characterized the polyphenolics composition of guava leaves extract and evaluated its inhibitory effect on XO and ACE in vitro.The extract effectively inhibited XO, ACE and Fe(2+)-induced lipid peroxidation in a dose-dependent manner; having half-maximal inhibitory concentrations (IC50) of 38.24 ± 2.32 μg/mL, 21.06 ± 2.04 μg/mL and 27.52 ± 1.72 μg/mL against XO, ACE and Fe(2+)-induced lipid peroxidation, respectively.The extract also strongly scavenged DPPH* and ABTS*(+).

View Article: PubMed Central - PubMed

Affiliation: Department of Biosciences and Biotechnology, Biochemistry Unit, Kwara State University, Malete, P.M.B., 1530, Ilorin, Nigeria.

ABSTRACT

Background/aim: Elevated uric acid level, an index of gout resulting from the over-activity of xanthine oxidase (XO), increases the risk of developing hypertension. However, research has shown that plant-derived inhibitors of XO and angiotensin 1-converting enzyme (ACE), two enzymes implicated in gout and hypertension, respectively, can prevent or ameliorate both diseases, without noticeable side effects. Hence, this study characterized the polyphenolics composition of guava leaves extract and evaluated its inhibitory effect on XO and ACE in vitro.

Materials and methods: The polyphenolics (flavonoids and phenolic acids) were characterized using high-performance liquid chromatography (HPLC) coupled with diode array detection (DAD). The XO, ACE, and Fe(2+)-induced lipid peroxidation inhibitory activities, and free radicals (2,2-diphenylpicrylhydrazyl [DPPH]* and 2,2´-azino-bis-3-ethylbenzthiazoline-6-sulphonic [ABTS]*(+)) scavenging activities of the extract were determined using spectrophotometric methods.

Results: Flavonoids were present in the extract in the order of quercetin > kaempferol > catechin > quercitrin > rutin > luteolin > epicatechin; while phenolic acids were in the order of caffeic acid > chlorogenic acid > gallic acids. The extract effectively inhibited XO, ACE and Fe(2+)-induced lipid peroxidation in a dose-dependent manner; having half-maximal inhibitory concentrations (IC50) of 38.24 ± 2.32 μg/mL, 21.06 ± 2.04 μg/mL and 27.52 ± 1.72 μg/mL against XO, ACE and Fe(2+)-induced lipid peroxidation, respectively. The extract also strongly scavenged DPPH* and ABTS*(+).

Conclusion: Guava leaves extract could serve as functional food for managing gout and hypertension and attenuating the oxidative stress associated with both diseases.

No MeSH data available.


Related in: MedlinePlus

2,2-diphenylpicrylhydrazyl % scavenging ability-extract concentration curve of guava leaves extract
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Figure 3: 2,2-diphenylpicrylhydrazyl % scavenging ability-extract concentration curve of guava leaves extract

Mentions: The ability of the extract to scavenge free radicals was tested using DPPH* and ABTS*+ assays, and the results are presented in Table 3. The extract strongly scavenged DPPH*, having half-maximal scavenging concentration (SC50) of 13.38 ± 0.86 μg/mL, relative to that of ascorbic acid (7.38 ± 0.27 μg/mL), the standard reference antioxidant. In addition, the extract scavenged DPPH* in a dose-dependent manner [Figure 3]. Similarly, the extract strongly scavenged ABTS*+ as shown by its TE antioxidant capacity (TEAC) value of 3.20 ± 0.14 mmol TEAC/g.


Guava leaves polyphenolics-rich extract inhibits vital enzymes implicated in gout and hypertension in vitro.

Irondi EA, Agboola SO, Oboh G, Boligon AA, Athayde ML, Shode FO - J Intercult Ethnopharmacol (2016)

2,2-diphenylpicrylhydrazyl % scavenging ability-extract concentration curve of guava leaves extract
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835986&req=5

Figure 3: 2,2-diphenylpicrylhydrazyl % scavenging ability-extract concentration curve of guava leaves extract
Mentions: The ability of the extract to scavenge free radicals was tested using DPPH* and ABTS*+ assays, and the results are presented in Table 3. The extract strongly scavenged DPPH*, having half-maximal scavenging concentration (SC50) of 13.38 ± 0.86 μg/mL, relative to that of ascorbic acid (7.38 ± 0.27 μg/mL), the standard reference antioxidant. In addition, the extract scavenged DPPH* in a dose-dependent manner [Figure 3]. Similarly, the extract strongly scavenged ABTS*+ as shown by its TE antioxidant capacity (TEAC) value of 3.20 ± 0.14 mmol TEAC/g.

Bottom Line: Hence, this study characterized the polyphenolics composition of guava leaves extract and evaluated its inhibitory effect on XO and ACE in vitro.The extract effectively inhibited XO, ACE and Fe(2+)-induced lipid peroxidation in a dose-dependent manner; having half-maximal inhibitory concentrations (IC50) of 38.24 ± 2.32 μg/mL, 21.06 ± 2.04 μg/mL and 27.52 ± 1.72 μg/mL against XO, ACE and Fe(2+)-induced lipid peroxidation, respectively.The extract also strongly scavenged DPPH* and ABTS*(+).

View Article: PubMed Central - PubMed

Affiliation: Department of Biosciences and Biotechnology, Biochemistry Unit, Kwara State University, Malete, P.M.B., 1530, Ilorin, Nigeria.

ABSTRACT

Background/aim: Elevated uric acid level, an index of gout resulting from the over-activity of xanthine oxidase (XO), increases the risk of developing hypertension. However, research has shown that plant-derived inhibitors of XO and angiotensin 1-converting enzyme (ACE), two enzymes implicated in gout and hypertension, respectively, can prevent or ameliorate both diseases, without noticeable side effects. Hence, this study characterized the polyphenolics composition of guava leaves extract and evaluated its inhibitory effect on XO and ACE in vitro.

Materials and methods: The polyphenolics (flavonoids and phenolic acids) were characterized using high-performance liquid chromatography (HPLC) coupled with diode array detection (DAD). The XO, ACE, and Fe(2+)-induced lipid peroxidation inhibitory activities, and free radicals (2,2-diphenylpicrylhydrazyl [DPPH]* and 2,2´-azino-bis-3-ethylbenzthiazoline-6-sulphonic [ABTS]*(+)) scavenging activities of the extract were determined using spectrophotometric methods.

Results: Flavonoids were present in the extract in the order of quercetin > kaempferol > catechin > quercitrin > rutin > luteolin > epicatechin; while phenolic acids were in the order of caffeic acid > chlorogenic acid > gallic acids. The extract effectively inhibited XO, ACE and Fe(2+)-induced lipid peroxidation in a dose-dependent manner; having half-maximal inhibitory concentrations (IC50) of 38.24 ± 2.32 μg/mL, 21.06 ± 2.04 μg/mL and 27.52 ± 1.72 μg/mL against XO, ACE and Fe(2+)-induced lipid peroxidation, respectively. The extract also strongly scavenged DPPH* and ABTS*(+).

Conclusion: Guava leaves extract could serve as functional food for managing gout and hypertension and attenuating the oxidative stress associated with both diseases.

No MeSH data available.


Related in: MedlinePlus