Phytochemical analysis
The results of qualitative phytochemical analysis of aqueous and alcoholic extracts of
P. betle L. revealed the presence of alkaloids, carbohydrates, flavonoids, phenols, saponins and terpenoids. Further quantitative phytochemical analysis revealed the presence of alkaloids (62.00±0.57 mg/g), flavonoids (7.68±0.36 mg of Rutin/g) and phenols (130.00±1.15 mg of Gallic Acid Equivalent/g) which has antigout and antioxidant activity (
Ling and Bochu, 2014). The phytocompounds detected in the GC-MS analysis are shown with their retention time (RT) and the area percentage (Table 1 and Fig 1). The major biologically active phytocompounds like acetoxy chavichol, chavibetol, eugenol, beta and gamma tocopherol, phytol and beta sitosterol were detected in the leaves of
Piper betle L.
Biological experiment
A detailed biological experiment was conducted to study the antigout and antioxidant activity of
P. betle L. herb in different doses (10 g/kg and 12.5 g/kg feed) in comparison with a standard antigout drug namely allopurinol in gout induced broiler chicken.
Production performance parameters estimation
The results of production performance parameters (Table 2) showed the equivalent body weight with less feed intake of
P. betle L. groups than control and better feed efficiency than Allopurinol. These findings might be due to the presence of antistress and antioxidant phytochemicals like flavonoids, polyphenols, terpenoids and alkaloids in
P. betle leaves (
Awang, 1988). But the production performance was declined in the allopurinol treatment group which might be due to the oxidative stress
(Carro et al., 2010). The influence of antioxidants on the body weight was very well correlated with the higher values of tissue SOD, CAT and GSH level in the
P. betle leaves group. The presence of Vitamin E in
P. betle L. herb might have reduced the stress due to gout induction in broiler chicken and prevented the predisposition to death and also improved the appetite and body weight in broiler chicken (
Traber and Atkinson, 2007).
The gout syndrome is commonly occurs at the age of 10-14 days in broiler chicks
(Prathapkumar et al., 2008) hence in the present study, the gout was induced on 10
th day of age using toxic dose of sodium bicarbonate. The clinical signs
viz. watery droppings, dullness, depression and unthriftiness and subsequent mortality (four birds) occurred in gout control group only. The hyperuricimia and higher creatinine level in gout control group bird’s causes gout leading to development of clinical signs
(Sodhi et al., 2008). The clinical signs and mortality did not occur in control and all the treatment groups, till the end of the trial which showed the protective effect of Allopurinol and
P. betle L. treatment groups in gout induced broiler chicken.
Biochemical parameters, antioxidant and Xanthine oxidase estimation
The progressive reduction of serum uric acid by the
P. betle L. treatment groups from day 15 to day 42 (Table 3) showed the prevention activity of herb against the development of gout in broiler chicken. It is also authenticated by the reduced xanthine oxidase enzyme activity (Table 5), which one is major culprit for hyperuricemia. Since the xanthine oxidase (XO) enzyme is a key mediator in uric acid production in liver and well known therapeutic target for many allopathic hypouricemic agents
(Borges et al., 2002), the estimation of hepatic xanthine oxidase in the gout induced broiler chicken could be a vital parameter to explore the antigout activity
. The equivalent suppression of xanthine oxidase enzyme activity showed by
P. betle L. groups as that of allopurinol indicated the probable mechanism of antihyperuricemicactivity. The xanthine oxidase inhibitory activity might be due to presence of acetoxy chavichol
(Tanaka et al., 1997) in
P. betle L. which might have reduced the uric acid generation. The diuretic activity of phytol (Krishnamoorthy and Subramaniam, 2014) compound present in
P. betle L. might have helped in the excretion of excess uric acid formed during gout induction.
Also, serum creatinine levels of
P. betle L. did not differ with control group at any stage of experiment (Table 3). This finding revealed that the renal functions were not affected due to gout induction in the
P. betle L. groups. Further, the results of serum biochemistry showed better total protein, albumin, globulin and albumin: globulin ratio level and reduced levels of ALT and AST (Table 4). Hence, the prophylactic dosing of herbs protected the visceral organs
viz. kidney, liver and heart from the gout induced damage as evidenced by
Behtari and Feizi (2015).
The antioxidant activity
P. betle L. is comparable with that of control group (Table 5). The values of SOD, CAT and GSH indicated the better antioxidant activity of
P. betle L. groups than allopurinol. The occurrence of oxidative stress in allopurinol treatment group was evidenced by the declined values of SOD, CAT and GSH than control and
P. betle L. groups
(Carro et al., 2010). The presence of antioxidant phytochemicals like flavonoids, polyphenols, terpenoids and alkaloids in
P. betle leaves (Awang, 1988) might have contributed the antioxidant activity when compared to allopurinol.
Gross and histopathology findings
pathological examination of gout control group birds showed severe chalky white deposits over heart and liver (Fig 2) and severe mottling of kidney with urate deposits and dilated ureter (Fig 3). Histopathology findings also revealed thatthe severe disruption of cardiac myofibers along with fibrous tissue hyperplasia in heart (Fig 4) and solid and feathery pattern of urate crystals and necrosis of tubular epithelium in renal tubules (Fig 5) in gout control group. Whereas the Allopurinol and
P. betle L. 10 g/kg (Fig 6 and 7) and
P. betle L. 12.5 g/kg group did not show any appreciable gross lesions and maintenance of normal architecture of visceral organs (heart, liver and kidney) in histopathology studies. The gross and histopathology pictures clearly illustrated that the prophylactic dosing of herbs prevented the gout induced damage in visceral organs and the effect is equivalent to allopurinol. The anti-inflammatory property of acetoxy chavichol, gamma and beta sitosterol (Saeidnia
et al. 2014) and eugenol
(Lee et al., 2007) of
P. betle L. might have alleviated the gouty inflammation in broiler chicken. Thesefindings are also very well supported by the earlier authors
(Wang et al., 2016).
The results of present study showed that significant differences were not observed between
P. betle L. treatment groups. Hence the most effective dose of
P. betle L.
viz.10 g/kg feed could be preferred as an economic point of view than 12.5 g/kg group for prophylactic use.