Effectiveness of oral administration of peppermint and coriander extracts on cognition in Scopolamine induced rat model of amnesia

Herbs and spices have been shown to be very effective in the management of the neurological disorders. They have neuroprotective actions that pre-vent the deterioration of the memory and other cognitive functions in the neurological diseases. Peppermint (menthe (cid:2) piperita, also known as M. balsamea wild) is a hybrid mint, a cross between water mint and spearmint. Peppermint consists of several medicinal components and research was tes-ti(cid:977)ied safety of consumption of the peppermint. The study compared the memory-boosting and regaining effects of oral administration of peppermint and coriander extracts. 36 male and female Wistar albino rats were assigned into three groups randomly that is control, coriander and peppermint groups, respectively. A control group (n=6) received neither peppermint nor coriander administered (milk was administered). Peppermint group (n=6) received peppermint extract. Coriander group (n=6) received coriander extract. Amnesia rat model was prepared by the administration of as intraperitoneal injection of scopolamine. The R-maze and T-maze tasks was conducted as mentioned in the literature. Mean trials of acquisition is signi(cid:977)icantly less (P<0.01) in the peppermint group. The number of mean trials of retention is signi(cid:977)i-cantly less (P<0.01) in the peppermint group. The mean trials for retention of the coriander group is signi(cid:977)icantly (P<0.05) less than the peppermint group. The study results support a positive impact of coriander and peppermint on cognition. The study recommends further detailed studies to support the administration of these extracts in the management of neurological diseases that deteriorates cognition.

ti ied safety of consumption of the peppermint. The study compared the memory-boosting and regaining effects of oral administration of peppermint and coriander extracts. 36 male and female Wistar albino rats were assigned into three groups randomly that is control, coriander and peppermint groups, respectively. A control group (n=6) received neither peppermint nor coriander administered (milk was administered). Peppermint group (n=6) received peppermint extract. Coriander group (n=6) received coriander extract. Amnesia rat model was prepared by the administration of as intraperitoneal injection of scopolamine. The R-maze and T-maze tasks was conducted as mentioned in the literature. Mean trials of acquisition is signi icantly less (P<0.01) in the peppermint group. The number of mean trials of retention is signi icantly less (P<0.01) in the peppermint group. The mean trials for retention of the coriander group is signi icantly (P<0.05) less than the peppermint group. The study results support a positive impact of coriander and peppermint on cognition. The study recommends further detailed studies to support the administration of these extracts in the management of neurological diseases that deteriorates cognition.

INTRODUCTION
Herbs and spices have been shown to be very effective in the management of the neurological disorders. They have neuroprotective actions that prevent the deterioration of the memory and other cognitive functions in the neurological diseases (Morinushi et al., 2000). Peppermint (menthe×piperita, also known as M. balsamea wild) is a hybrid mint, a cross between water mint and spearmint. Peppermint consists of several medicinal components and research was testi ied safety of consumption of the peppermint. Several studies support the positive impact of peppermint on the cognitive functions (Johnson et al., 2011;Smith et al., 2012;John-son et al., 2013).
Pharmacological studies in animals have shown that coriander has multiple bene icial effects. Corianer sativum have been used as a drug for indigestion, against worms, rheumatism and pain in the joint. The oil produced fro m this plant was effective against the bacteria. It also have a reversal of memory de icits. The leaf extract of the plant exerted an anti-anxiety effect on mice in the elevated plus-maze and open ield tests. The plant leaves was found to be effective in preventing the effects of the lead (Moattar and Takhesh, 2011;Chithra and Leelamma, 2000). Though the studies exist that observed the memory-enhancing effects of peppermint and coriander separately, the comparative studies were scanty. Hence, the study recommends further detailed studies to support the administration of these extracts in the management of neurological diseases that deteriorates cognition.

METHODOLOGY
Animals 36 male and female Wistar albino rats were randomly assigned into three groups.

A control group (n=6)
Neither peppermint nor coriander administered (milk was administered)

Amnesia rat model
Amnesia rat model was prepared by the administration of as intraperitoneal injection at a dose of 1 mg / Kg of scopolamine (Buscopan ® tablets powdered and mixed with 50 ml sterile 0.9% normal saline) (Jasira et al., 2013).

T-maze
The T-maze task was conducted as mentioned in the literature (Jasira et al., 2013).

Radial arm maze
The T-maze task was conducted as mentioned in the literature (Jasira et al., 2013).

Ethical Consideration
The study protocol was approved by the Ethical Committee of Little Flower Medical Research Centre, Angamaly, Kerala, India. All the study procedures were as per the guidelines of CPCSEA.

Statistical analysis
Data was analyzed using SPSS 16.0 version. Student T-Test and One Way Anova Test are used for the data analysis. A p-value less than 0.05 was considered as signi icant.

RESULTS
Mean trials of acquisition is signi icantly less (P<0.01) in the peppermint group. The number of mean trials of retention is signi icantly less (P<0.01) in the peppermint group (Table 1). The number of mean trials acquisition is not signi icantly different between the coriander and peppermint groups. The mean trials for retention of the coriander group is signi icantly (P<0.05) less than the peppermint group ( Table 2). The number of trials for the acquisition of groups were compared by one way ANOVA. The signi icant difference was observed (p<0.001). Then the number of trials for retention of these three groups indicates a signi icantly different with (p<0.001) between the groups (Table 3). The number of trials for the acquisition of groups were signi icantly different (p<0.001). Then the number of trials for retention of these three groups was signi icantly different (p<0.001) between the groups ( Table 4). The number of trials for the acquisition of groups were signi icantly different (p<0.001). Then the number of trials for retention of these three groups were signi icantly different (p<0.001) between the groups ( Table 5). The number of trials for the acquisition of groups were signi icantly different (p<0.001). Then the number of trials for retention of these three groups was signi icantly different (p<0.001) between the groups (Table 6).

DISCUSSION
Though the studies exist that observed the memoryenhancing effects of peppermint and coriander separately, the comparative studies were scanty. Hence, the study recommends further detailed studies to support the administration of these extracts in the management of neurological diseases that deteriorates cognition. There exists plenty of literature that supports the memory-enhancing effects of the peppermint (Akben and Coskun, 2019;Nandy et al., 2018). Further, peppermint has several bene its like antiseptic, antimicrobial properties, etc. It also has an in luence on the secretion of hormones (Eccles, 1994;Gustafson, 2015;Robbers and Tyler, 1998). The underlying mechanism in improving cognition may be acting on the neuronal level, which has to      be further explored with detailed studies in this area. The other possible mechanism is improving the blood supply to the brain, which makes the brain to function better (Raudenbush et al., 2009). Coriander sativam leaves were found to be effective in preventing the scopolamine-induced changes in memory. The mechanism may be by inhibiting the acetylcholine esterase activity. Long-term administration of coriander leaves was found to be effective in the management of Alzheimer's disease. The present study results are in the same line as earlier studies, as we have observed a positive impact on cognition followed by the oral administration of coriander extract. When coriander and peppermint groups are compared, the memory-boosting and regaining effects of peppermint are signi icant in R-maze, whereas memory boosting and regaining effects of coriander are signi icant in T-maze.

CONCLUSIONS
The study results support memory boosting and regaining effects of coriander and peppermint. The study recommends further detailed studies to support the administration of these extracts in the management of neurological diseases that deteriorates cognition.

Funding Support
None.

Con lict of Interest
None.