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The Toxic Effects of Cucurbitacin in Paddy Melon (Cucumis Myriocarpus) on Rats

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The Toxic Effects of Cucurbitacin in Paddy Melon (Cucumis Myriocarpus) on Rats International Journal of Research and Review www.ijrrjournal.com E-ISSN: 2349-9788; P-ISSN: 2454-2237 Original Research Article The Toxic Effects of Cucurbitacin in Paddy Melon (Cucumis Myriocarpus) on Rats Violet Nakhungu Momanyi Kenya Agricultural and Livestock Research Organization (KALRO), National Agricultural, Research Laboratories (NARL), P.O. Box 14733-00800, NAIROBI, Kenya. Received: 16/09/2016 Revised: 28/09/2016 Accepted: 28/09/2016 ABSTRACT Untold losses of livestock are caused by various poisonous plant families each year globally, through death, physical malformation, abortion and lowered gain. Such families include; Solanaceae, Apocynaceae, Euphobiaceae and Cucubitaceae, where paddy melon (Cucumis myriocarpus) belongs. The main objective of the study was to carry out acute toxicity test of crude cucurbitacin in the ripe fruits of paddy melon (Cucumis myriocarpus) and determine its lethal dose (LD50) on laboratory rats. The crude extract of paddy melon was highly lethal, with an LD50 of 0.68g/kg body weight. Key words: Cucumis myriocarpus, Toxicity, rats, LD50. INTRODUCTION parasympatholytic alkaloids, atropine, Plant poisonings cause about 10-25 hyascine and hyoscyanine exert an % livestock losses due to lack of knowledge antimuscarinic effect causing neurological on the chemical composition, medicinal and disorders without pathological lesions toxic effects of many pasture plants. (Matthews and Endress, 2004). Solanaceae family like Daturastramonium Neurological disorders with distinct contain Atropine toxins which exert an pathological lesions are caused by plants antimuscarine effect blocking transmission which produce mycotoxins that cause of autonomic impulses at ganglia and muscle tremors, greyish-white areas of neuromuscular junctions (Kurzbaumet al., hyaline degeneration and necrosis 2001). Those of Apocynaceae like particularly near the insertions and origins Acokanthera spp. contain toxic cardiac of the larger muscle groupsCAB, 1987- glycosides, such as quabain, that affect the 1989; 1990-1991). Paralysis occurs in cardiovascular system causing bradycardia, animals that survive. Plants that poison the heart block; poison the respiratory and GIT induce signs other than diarrhoea, nervous systems; and the Gastro-Intestinal cause diarrhoea and bloat, impaction or Tract (GIT). Toxic materials in the latex of gastroenteritis due to mechanical injury. Euphobiaceae irritate the eyes and mucous Death may occur due to asphyxia, a result of membrane and injure the integument. Oxalic chocking on inhaled ingest a, or paralysis of acid in oxalics damages kidneys. Many the respiratory centre, exhaustion from losses occur with irregularities due to vormition and purgation, heart failure and unpredictable conditions but some can be acute or chronic foreign body pneumonia avoided by good management such as (CAB, 1987-1989; 1990-1991). spraying the pasture with herbicides Objectives (Ashton, et al., 1991). Plants that contain The objectives of the study were; International Journal of Research & Review (www.gkpublication.in) 1 Vol.3; Issue: 9; September 2016 Violet Nakhungu Momanyi. The Toxic Effects of Cucurbitacin in Paddy Melon (Cucumis Myriocarpus) on Rats 1. To assess the symptoms and side After taking the weight of 10 empty effects of crude cucurbitacin extract Petri-dishes, a sample of 20ml of the crude on the gastro-intestinal tract, lungs cucurbitacin was measured using a 20 ml. and liver of laboratory rats pipette and poured in each of the dishes. o 2. To determine the lethal dose (LD50) The dishes were heated in an oven at 44 c of crude Cucurbitacin extract for 3 days to evaporate water and leave the RESEARCH HYPOTHESIS dry crude cucurbitacin compound. The There will be no significant petri-dishes containing the crude compound association between the concentration of were weighed and the average weight of the crude cucurbitacin extract administered and crude cucurbitacin in the sample extract the number of rats that die. calculated. The weight of dried crude RESEARCH METHODOLOGY cucurbitacin in the 20 ml. sample was used Breeding of rats to calculate the weight of crude cucurbitacin Rats were bred and crude in the volume of crude cucurbitacin extract cucurbitacin administered at The Kenya given to the rats in each treatment. Weights Polytechnic (now, The Technical University of test rats were taken, recorded and the of Kenya) animal house. One male rat was average weight calculated. The confined in a cage with three females and concentration of the crude cucurbitacin left to mate freely. After confirming that administered to the rats in each treatment conception had taken place, the pregnant was calculated using the average weight of rats were separated and each put in its own the test rats and the crude cucurbitacin in the cage. After parturition, the young ones were volume of the extract administered orally to reared for two months before carrying out the rats. Single doses of varying the tests. concentrations of crude cucurbitacin extract Sampling of fruits and Extraction were administered to six groups of rats and About 95% ripe fruits ofPaddy a placebo (distilled water) administered to melon (Cucumis myriocarpus) were the control. sampled randomly from plants growing on Treatment administration free land fields and hedges at Ngecha The design of the experiment was a village in Kiambu County where livestock Randomised Complete Block Design graze freely. Extraction of crude (RCBD). The 7 treatments indicated in cucurbitacin from the fruits was done at Table 1 were replicated 3 times. Each National Agricultural Research Laboratories treatment had ten (10) rats. Each test rat was (NARL). Before extraction, the fruits were placed in a desicator containing diethyl thoroughly washed and rinsed using tap ether to sleep and a catheter pushed through water. The fruits were then cut into small the mouth down the gullet. The indicated pieces, mashed and their weight taken. dose was then administered through the Fruits were then mixed with clean tap water inserted catheter using a syringe. This was in a big pan (sufuria) at a ratio of 1:2 (w/v). repeated for all the rats in all treatments. Normal boiling was done using an electric Rats were left to recover in their cages after cooker for 30 minutes. The crude extract which observations started immediately. obtained after boiling was cooled using a Symptoms of toxicity were observed cold water bath, filtered using a clean fine immediately after administration, and for a woven cloth, kept under refrigeration and period of 2 weeks. Rats from the control, the administered to the test rats the following ones that died and those that survived were day. dissected and macroscopic observations Determination of Cucurbitacin made on the Gastrointestinal Tract (GIT), concentration lungs, and the liver. International Journal of Research & Review (www.gkpublication.in) 2 Vol.3; Issue: 9; September 2016 Violet Nakhungu Momanyi. The Toxic Effects of Cucurbitacin in Paddy Melon (Cucumis Myriocarpus) on Rats Table 1: Treatments of crude cucurbitacin administered to test rats Treatment number 1 2 3 4 5 6 7 Concentration (g/kg body weight) (Control) 0 0.22 0.47 0.68 0.94 1.15 1.17 Statistical Analysis higher concentrations 0.68g/kg, 0.94g/kg, Data was entered in SPSS version 1.15g/kg and 1.17g/kg, but severity 18.0 then subjected to analysis of variance increased with concentration of (ANOVA) to compare effects of the factors Cucurbitacin. Rats were seen lying down being studied. Significant results were immediately after administration (instead of further analyzed to check where the sitting like in the lower doses). Rats given differences occurred using Fisher’s least concentration of 0.94g/kg, 1.15g/kg and significant difference (LSD) at 5% level 1.17g/kg started rolling, breathed very fast, were unable to move and eat, and looked RESULTS very miserable for most days. Severity of There were very high significant poisoning was reflected in high death rate of differences (p <0.001) between the number 50% within 6 hours for concentrations 1.15 of live and dead rats for concentrations 1.15 and 1.17g/kg, and 25% within 12 hours for and 0.47g/kg body weight. However, dead concentration 0.94 g/kg. Recovery time for rats for concentration 1.15g/kg were survived rats increased with concentration significantly (p<0.001) more than live ones of cucurbitacin. while live rats for 0.47g/kg were Macroscopic observations significantly (p <0.05) more than dead ones. Rats dissected from the control and Concentration 1.17g/kg body weight killed the lowest concentration 0.22g/kg showed a all the rats (Fig. 1; Fig. 2). normal stomach, intestines, lungs and liver. Dead rats dissected from higher concentrations 0.47g/kg to 1.17g/kg had acute inflammation of intestines and the stomach that were poorly vascularized as compared to rats from the control. Lungs were swollen and had severe haemorrhage and accumulation of blood whose severity increased with concentration of cucurbitacin. Livers were swollen/ enlarged and were harder than the normal ones. Rats that survived from concentrations 0.47g/kg to 1.15g/kg showed intestines whose blood vessels had diminished and intense congestion was observed over large areas of Fig.1: Dead rats versus crude cucurbitacin concentration p = 0.05 the small intestines. Some lungs were degenerated and had haemorrhages while Poisoning symptoms others had hard enlarged lobes. Enlarged Symptoms of poisoning were livers appeared darker and degenerated. observed, severity increasing with Lethal dose (LD50) concentration of crude cucurbitacin. Rats The lethal dose (LD50) is the given concentration 0.22g/kg and 0.47g/kg concentration that kills 50% of the test took a sitting posture immediately after animals during the time of study. Results administration, breathed fast, moved slowly (Figs. 1 and 2) in this study indicated that and were dull on 1stand 2nd days. Most rats the LD50 of crude cucurbitacin was 0.68g/kg began recuperating on the 3rd day, with full th th body weight. recovery on the 4 and 5 day respectively.
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