Acute Toxicity, Phytochemical Screening, Analgesic, and Anti-Inflammatory Activities of Aqueous and Methanol Root Extracts of Maerua triphylla A. Rich. (Capparaceae).

Laetitia Wakonyu Kanja,Brian Muyukani Wangusi,Isaac Mpapuluu Ole-Mapenay,Jared Misonge Onyancha,Yongbo Xue

doi:10.1155/2021/3121785

Laetitia Wakonyu Kanja, Brian Muyukani Wangusi + Show 3 more

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https://doi.org/10.1155/2021/3121785

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Abstract

Maerua triphylla root extracts are used by Maasai and Kikuyu communities in Kenya to manage headaches, stomachaches, migraines, and rheumatism. However, scientific data on their safety and efficacy are limited. The current study aims to investigate the safety, phytochemical constituents, analgesic, and anti-inflammatory activities of M. triphylla root extracts. Aqueous and methanol M. triphylla root extracts were prepared by cold maceration, and the extracts' safety was evaluated using Wistar rats according to the Organization for Economic Cooperation and Development (2008) guidelines. Standard qualitative phytochemical screening methods were used for the detection of various phytochemical groups in the extracts. Analgesic activity assay in Swiss albino mice was done using the acetic acid-induced writhing test, while anti-inflammatory activity was determined in Wistar rats using the acetic acid-induced paw edema method. The methanol and aqueous extracts revealed LD50 > 2000 mg/kg bw, classifying them as nontoxic. The presence of cardiac glycosides, flavonoids, alkaloids, and phenols was observed in both extracts. However, saponins were only present in the methanol extract. In the analgesic study, mice that received 100 mg/kg bw and 500 mg/kg bw of aqueous root extract of M. triphylla had significantly lower acetic acid-induced writhing than mice that received acetylsalicylic acid 75 mg (reference drug) (p < 0.05). Additionally, mice that received 500 mg/kg bw of methanol root extract of M. triphylla had significantly lower acetic acid-induced writhing than mice that received the acetylsalicylic acid 75 mg (p < 0.05). In the anti-inflammatory study, there was no significant difference (p < 0.05) between the inhibitory activity of different doses of the aqueous root extract of M. triphylla and a 50 mg/kg dose of diclofenac sodium (reference drug) on acetic acid-induced paw edema in rats. Moreover, there was no significant difference in the inhibitory activity of 100 mg/kg bw and 500 mg/kg bw doses of the methanol root extract of M. triphylla and a 50 mg/kg dose of diclofenac sodium on acetic acid-induced paw edema (p > 0.05). These findings suggest that the roots of M. triphylla may be useful in the safe mitigation of pain and inflammation and therefore support their ethnomedicinal use in the management of pain and inflammation.

Highlights

Pain is an unwanted emotional or receptive sensation localized to a part of the body
Identification and authentication of the prepared specimen were done by a plant taxonomist at the Department of Land Resource Management and Agricultural Technology (LARMAT), University of Nairobi. e voucher specimen number LARMATCAP36 was assigned to the specimen. e collected roots of M. triphylla were cleaned with running water, cut into small pieces, air-dried in a well-ventilated room for 14 days, and crushed into coarsely powdered material using an electric grinder. e powder was kept in a well-labeled manila sack and kept in a cool and nonhumid place awaiting extraction
Acute Oral Toxicity Effects of M. triphylla Root Extracts. e observations from acute oral toxicity studies of aqueous and methanol M. triphylla root extracts revealed the absence of signs of toxicity and lethal effects in Wistar rats at the limit/cut-off dose of 2000 mg/kg bw. e doses that could be lethal to half of the experimental rats (LD50 values) for M. triphylla root aqueous and methanol extracts were observed to be above 2000 mg/kg bw. erefore, the extracts were classified as nontoxic according to the OECD 425 guidelines

Summary

Introduction

Pain is an unwanted emotional or receptive sensation localized to a part of the body. It is often described in terms of penetrative or tissue-destructive process like stabbing, burning, tearing, and squeezing [1]. Evidence-Based Complementary and Alternative Medicine diseases generally relies on a large number of commercial preparations, including nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroids, and opioid analgesics [5]. Most of these drugs have adverse effects like peptic ulcer, dyspepsia, and gastrointestinal bleeding [6]. These drugs are costly and have low efficacy [7]

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