A study was conducted in the postharvest laboratory of the Federal College of Horticulture Dadinkowa, Gombe State, Nigeria, to investigate the effects of some postharvest treatments, namely; hot water treatment, gibberellic acid, ground nut oil, extracts of garlic, extracts of neem leaves, mixture of extracts of neem leaves and garlic and distilled water (control) on the storage quality of mango fruits. The experiment was laid out in a complete randomized design (CRD) replicated three times. The results indicated that all the treatments reduced weight loss, fruit diameter, fruit decay and loss in firmness. However, gibberellic acid was found to be most effective in minimizing fruit weight loss and fruit diameter when compared with other treatments. In terms of fruit decay and fruit firmness however, mixture of extracts of neem leaves and garlic (500 ml each) performed better than all other treatments throughout the storage period of 15 days. Hence, it can be concluded that application of gibberellic acid and extracts of neem leaves and garlic enhances the shelf life of mango fruits, and can maintain good fruit quality under ambient condition for up to 15 days.
Hepatoprotective Activity of Aqueous and Methanolic Extracts of Watermelon Seeds On Salt and Paracetamol-Induced Liver Damage in Female White Rats (Published)
Paracetamol is the commonest over the counter drug for the treatment of body pains. However, an overdose of this drug has detrimental effects on the liver and other internal organs such as the kidneys. This experiment was conducted to investigate the hepatoprotective and regenerative effects of aqueous and methanolic extracts of watermelon seeds on the liver of rats given overdose of common salt and paracetamol. Thirty five (35) female albino rats were used for this experiment and the rats were randomly distributed into seven groups with each group containing five (5) rats. The rats in group A were given only vital feed (40% of the body weights of the rats) without any extract. This was the normal group. The rats in groups B, D and E were given physiological saline at the dosage of 10g/kg body weight once orally. In addition, 200 mg/kg and 400 mg/kg (body weight) of aqueous extract of watermelon seed were given to rats in groups D and E orally twice daily respectively. The rats in groups C, F and G were given paracetamol at dosage of 3g/kg body weight once orally at the beginning of the experiment. In addition, 200 mg/kg and 400 mg/kg (body weight) of methanolic extracts of watermelon were given to rats in groups F and G orally twice daily respectively. These experiments were monitored for 28 days. The results of the histopathological analyses showed that overdose of salt and paracetamol damaged the liver cells of the rats. However, treatments of the rats with aqueous and methanolic extracts of the seeds of watermelon have hepatoprotective and regenerative properties.