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1.Introduction
Moringa oleifera (M. oleifera) is an angiosperm plant, mainly growing in the Indian subcontinent, where its various parts have been utilized throughout history as both food and medicine. Recently has been cultivated in all tropical and sub-tropical countries. The prophylactic, therapeutic and nutritional features of this plant are being widely explained on the internet. Regular consumption of the plant parts has been promoted as an approach of personal self-medication in various diseases and health preservation[1]. Generally, any plant contains chemical compounds namely called phytochemical groups such as cyanogenic glycosides tannins, oxalates, saponins, phytates, and trypsin inhibitors which known as secondary metabolites and having biological activity. These metabolites can be utilized in nutrition and as pharmacologically-active agents. Herbs are also known to have high amounts of essential nutrients, vitamins, minerals, fibre, fatty acids and oils obtained from the seeds and leaves such as Moringa oleifera are in high demand for their therapeutic value. [2]. Generally, many articles have been published and showed various therapeutic effects of the Moringa leaves and seed extracts.

2.1. Nutritional value
Proximate and Van Soest methods were used by Moyo et al, 2011, to evaluate the nutritional value of dried Moringa leaves. They were found the dried leaves had crude protein amounts of 30.3% and 19 amino acids. The mineral contents: phosphorus (0.3%), calcium (3.65%), magnesium (0.5%), sodium (0.164%), potassium (1.5%), sulphur (0.63%), zinc (13.03 mg/kg), copper (8.25%), manganese (86.8 mg/kg), iron (490 mg/kg) and selenium (363 mg/kg). 17 fatty acids were observed with α-Linolenic acid (44.57%). Vitamin E had the highest concentration of 77 mg/100 g than beta-carotene, which had 18.5 mg/100 g in the dried leaves. The fibre content was neutral detergent fibre (11.4%), acid detergent fibre (8.49%), acid detergent lignin (1.8%) and acid detergent cellulose (ADC) (4.01%. The condensed tannins had a value of 3.2%, while total polyphenols were 2.02%. they were concluded that; the values of amino acids, fatty acids, minerals and vitamin profiles reflect a desirable nutritional balance[3].

2.2 Antimicrobial Activity
Chloroform and ethanolic extracts of both seeds and leaves of Moringa were studied by Bukar et al, 2010, to assess the antimicrobial activity against the common food contaminating bacteria such as Escherichia coli, Pseudomonas aeruginosa, Enterobacter aerogenes and Staphylococcus aureus. The antibacterial assay results showed that: ethanol extract of M. oleifera leaves exhibited broad-spectrum activity against the tested organisms; they were concluded that the wide spectrum of these extracts can be effectively used as a food preservative or sanitizer[4]. Moreover, Mashiar et al, 2009, stated that; the aqueous juice of Moringa leaves showed potential antimicrobial activity against Gram-negative bacteria like Shigella shinga, Pseudomonas spp. and Shigella sonnei and six Gram-positive bacteria: Bacillus cereus, Streptococcus-B- haemolytica, Staphylococcus aureus, Bacillus subtilis, Sarcina lutea and Bacillus megaterium, whereas, ethanolic extract of the fresh leaves exhibited inhibitory effect against all the tested Gram-negative and Gram-positive bacteria except in S. aureus and Streptococcus-B- haemolytica. They were concluded that; the extracts and juice of M. oleifera Lam. can be used to discover an antibacterial agent for developing new pharmaceuticals to control the pathogenic bacteria responsible for severe illness[5,6]. Furthermore, the anti-fungal activity of Moringa seed and leaves extracted by 70% ethanol was studied, the Results showed that both essential oil (crude and sub-fraction) and seed extracts have an anti-fungal effect on T. rubrum, E. Xoccosum, T. mentagrophytes and M. canis. And both leaf crude extract and sub-fractions had little effect on dermatophytes, they reported that; the isolated extracts could be used for the future development of topical antifungal medicine[7].

2.3. Antidiabetic effect
The aqueous extracts of M. Oleifera leaves was examined by Jaiswal et al, 2009, via an in vivo study using experimental rats, the extract was applied orally to investigate their hypoglycemic and antidiabetic activity on fasting blood glucose (FBG), oral glucose tolerance test (OGTT) and postprandial glucose (PPG) of normal and streptozotocin (STZ) induced sub, mild and severely diabetic rat. They were found the dose of 200 mg/kg decreases blood glucose level (BGL) of normal animals by 26.7% and 29.9% during FBG and OGTT studies respectively. Accordingly; they were concluded that; the orally administered aqueous extract of the plant efficiently controls the blood glucose and could be elected as antidiabetic medicine[8]. The same in vivo study for The hypoglycemic effect of two low doses of Moringa seed powder (50 and 100 mg/kg) was investigated by Abdulrahman et al, 2015, they have reported the same findings without liver or kidney toxicity[9].

2.4. Anti-oxidant effect
The antioxidant effect of Moringa leaves was in vitro studied by streelatha and Padma (2009), they have tested the antioxidant effect in two stages of maturity. The successive aqueous extract of Moringa oleifera was showed a novel strong scavenging effect on 2,2,-diphenyl-2-picrylhydrazyl (DPPH) free radical, nitric acid radical, superoxide and inhibition of lipid peroxidation. They found the free radical scavenging effect of the leaves extract was similar to that of reference antioxidant, and they were reported that; the M. oleifera leaves have a strong antioxidant effect against the free radicals and preventing the damage that results by the oxidation of biomolecules and affording the significant protection. Furthermore, Shahid and Bhanger were Also examined the methanolic extract of Moringa leaves collected from Pakistan and they were found comparative findings regarding the antioxidant activity[10,11]

2.5 Medicinal uses of all parts of Moringa
Traditionally, different parts of the Moringa tree act as antitumor, circulatory stimulants, antiepileptic, antipyretic, antiulcer, anti-inflammatory, antispasmodic, anti-hypertensive, diuretic, cholesterol lowering, and hepatoprotective. The leaves: are the most commonly used part of the plant and used to: treat asthma, flu, heartburn, Dyslipidemia, malaria, syphilis, diarrhoea, pneumonia, scurvy, headaches, bronchitis, skin diseases, eye and ear infection[12].

3. Conclusion
Moringa represents a potential medicinal plant for populations in Asia and Africa, and they considered Moringa as life savior, in addition Moringa can be purchased at affordable prices and the traditionally used method to extract, is aqueous maceration, decoction and infusion. There are various publications describing various therapeutic uses of this plant, which in turns attracts the professional phytochemists, pharmacologists and pharmaceutical technologists to screen, isolate, identify and to develop the pharmacologically active constituents in suitable dosage forms in a manner that preserving the activity and providing the safety of the isolated entities. Medicinal chemistry could also provide the possibility to develop the pharmacophores of these active entities.