Effect of Processing on Nutritional and Anti-Nutritional Composition of Urena Lobata Leaves
The proximate, phytochemical, mineral and vitamin composition of the processed urena lobata leaves were analyzed using Association of Official Analytical Chemist (AOAC) method, Arisa, Onwuka, Pearson, Harboure ,and Atomic Absorption spectrophotometry, Okwu and Josiah procedures respectively. This study is aimed at investigating the nutrition and anti -nutrition content of the leaves .The proximate analysis of the raw were 49.55% for moisture, 17.25% for crude protein, 7.44% for crude fibre, 7.95% for ether extract, 9.09% for Ash and 8.73% for carbohydrates. For oxalate, tannins, saponnins, alkaloids and flavonoids were 4.62mg/100g, 2.5mg/100g, 3.01mg/100g, 6.92mg/100g and 3.33mg/100g for respectively. While 48.13mg/100g for calcium, 34.77mg/100g for magnesium, 29.85mg/100g for sodium, 40.97mg/100g for zinc and 21.21mg/100g. And 1.95mg/100g for vitamin B1,1.06mg/100g for vitamin B2, 3.79mg/100g for vitamin B3 and 19.29mg/100g for vitamin C for raw respectively. The presence of some phytochemicals such as tannins, saponnins, alkaloids and flavonoids and some essential minerals proves that this leaves is a source for medicine.
Introduction
Plants are known to be the main sources of medicine. Many years ago plants has been used by human in treatment of different kinds of diseases [1, 2, 3, 4, 5].
Base on world health organization analyses (WHO) roughly 80% of world’s population currently uses herbal medicines in treating various illnesses [6, 7, 8, 9, 10]. Recently, there has been continuous reviewing of interest in the use of medicinal plants in developing countries as herbal medicine has recorded to be harmless and there is no side effect especially when compared with synthetics drugs.
About 400,000 plants species, only about 6% have been evaluated for planed activity controlled phyto- pharmacological studies of herbal medicine. Chemical product of animals and plants are divided into primary and secondary metabolites. Primary metabolites are those chemicals founds in all the species and they are sub- divided into lipids, nucleic acid, protein and carbohydrate while secondary metabolite are those known as natural products that are plant chemical compounds that play major roles in treatment of diseases [11, 12].
They are best used as medicine and main sources of both traditional and pharmaceutical drug [13, 14]. Urena
lobata l. belongs to the family or member of the malvaceae.
It is also known as Caesar weed or congo jute. It is annual, erect ascendant under shrub measuring up to 0.5 meter to 2.5meter tall [15].
The stems are covered with minute star¬-like hairs and often tinged purple. It is widely distributed as a weed in tropics of both hemisphere including Brazil and Southeast Asia. Like the stem, leaves also have tiny hairs. Flower of the plant are pink-violet and grow one centimetre in width. The fruit is also hairy and may stick to clothing material or fur. The stem is used as teeth brush for healthy gum
Materials and Methods
Fresh samples were obtained from uncultivated farm land in umuezeokoha ezza north local government area of Ebonyi state, Nigeria.
Sample Preparation
The leaves were properly detached, washed with distilled water and allowed to drain. Chopped into homogenous pieces and divided into three portions. One part was oven dried for four hours at 55 degree while the second portion was analyse raw (control), but the third portion was boiled and oven dried.
Sample Treatment
Exactly 200g of the homogenous pieces of U. Lobata were immersed in a well-covered beaker, containing 500ml of boiling water, the leaves were removed after 10 minutes of boiling and oven dried for 4 hours at 55 degrees.
The oven dried and boiled + oven dried were then grinded into powder and kept in air tight container prior for analysis.
Proximate Analysis
The method of AOAC [16] was used for the determination of moisture, crude protein, crude fibre, ether extract and ash content on raw , oven dried and boiled + oven dried of the leaves. Total carbohydrate was determined by difference
Phytochemical Analysis
The method of AOAC [16] was used in the determination of saponin and tannin. The gravimetric method of Harbone [17] was used in the determination of alkaloid and flavonoids while the method of pearson [18]
was used in the determination of oxalate content of the raw, oven dried and boiled + oven dried of the leaves.
Mineral Assay
The atomic absorption spectrophotometer was used in the analysis of Ca, Mg, Zn, and Na whiles the Arisa, et al. [19] method was used in the analysis of the phosphorus content of the raw, boiled + oven dried and oven dried of the leaves.
Vitamin Assay
The thiamine, riboflavin and niacin content of the leave were determined using the method of okwu & Josiah [20], while vitamin C content of the leaves were determined using the titrimetric method of Onwuka [21].
Statistical Analysis
Results were reported as the mean± standard deviations of duplicate experiments. One way analysis of variance (ANOVA) was used for the comparison of means. Results were considered to be significant at P˂ 0.05.
Proximate Composition
The results of the proximate composition of the raw and processed U. Lobata leaves are tabulated in table 1. The moisture content, crude protein, crude fibre, ether extract, ash and total carbohydrate and their values are 49.55, 17.25, 7.44, 7.95, 9.09 and 8.73 respectively.
Moisture is relatively higher (P˂ 0.05) in raw leaves compared to oven dried leaves and boiled + oven dried leaves.
The crude protein content of the raw (control) leaves significantly increase (P˂0.05) when compared with the oven dried and boiled + oven dried leaves of the U. Lobata crude fibre content of the control. U. Lobata leaves significantly decreased (P˃0.05) when compared with the boiled +oven dried. On the contrary, the crude fibre content of the boiled leaves significantly higher (P˂0.05) when compared with the raw.
Ether extract content of the oven dried U. lobata leaves were significantly different (P˂0.05) when compared to others.
Ash content of the control was significantly higher (p˂0.05) when compared to boil +oven dried and oven dried leaves.
The total carbohydrate content of the boiled +oven dried were significantly higher (P˂0.05) compared to others, but, total carbohydrate content of the control significantly decrease (P˂0.05) this decreased may attributed to the high moisture content of the control.
The phytochemical composition of the raw and processed urena lobata leaves are shown in table 2.
As presented in the table, the oxalate content of the raw leaves is considered to be highest but when the raw leaves were subjected for further treatment, the oxalates content drops drastically. Also the raw leaves contained considerable amounts of tannin, saponnin, alkaloid and flavonoid. And they were significantly decreased (P˂0.05) when processed, compared to the raw leaves of U. Lobata. The decreased may be as a result of the oven drying and boiling as most of it might have lost during the processing.
Vitamin composition of the raw and processed U. Lobata leaves is presented in table 4. As presented, boiled + oven dried attributed to the significant decreased (P˂0.05) observed in vitamin B1, B2, B3 and C content when compared to the control.
The mineral composition of the raw and processed forms of the urena lobata leaves are represented in table 3. As presented in the table 3, the control leaves contained 48.31 ± 0.01 calcium, 34.77 ± 0.01 Mg, 29.85 ± 0.02 Na, 40.97 ± 0.02 Zn and 21.21 ± 0.01 P; oven dried leaves contained 45.26 ± 0.01 Ca, 33.81 ± 0.01 Mg, 29.33 ± 0.02 Na, 40.54 ± 0.01 Zn and 20.13 ±0.02 P; boiled + oven dried contained 36.53 ± 0.03 Ca, 25.16 ± 0.02 Mg, 21.16 ± 0.01 Na, 34.12 ± 0.02, Zn and 15.03 ± 0.02 P, respectively.
- Parameters
- Raw oven dried
- Boiled + Oven dried
- Moisture content
- 49.55±0.32
- 5.55±0.15
- 7.63±0.22
- Crude protein
- 17.25±0.01
- 17.75±0.06
- 13.64±0.01
- Crude fibre
- 7.44±0.01
- 7.93±0.02
- 7.97±0.01
- Ether extract
- 7.95±0.03
- 8.41±0.03
- 7.75±0.02
- Ash content
- 9.09±0.01
- 9.04±0.03
- 8.82±0.01
- Carbohydrate
- 8.73±0.34
- 51.32±0.18
- 54.19±0.19
Table 1: proximate composition (%) of raw and processed U. Lobata leaves.
| Parameter | Raw | Oven dried | Boiled + oven dried | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Oxalate | 4.62±0.01 | 4.10±0.01 | 2.85±0.02 | ||||||
| Tannin | 2.51±0.02 | 2.02±0.01 | 1.67±0.01 | ||||||
| Saponnin | 3.01±0.01 | 2.75±0.01 | 1.92±0.01 | ||||||
| Alkaloid | 6.92±0.02 | 6.51±0.01 | 4.49±0.02 | ||||||
| Flavonoid | 3.33±0.00 | 3.03±0.02 | 2.43±0.02 |
Table 2: phytochemical composition (mg/100g) of raw and processed urena lobata leaves.
| Parameters | Raw | Oven dried | Boiled + oven dried | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Calcium | 48.31±0.01 | 45.26±0.01 | 36.53±0.03 | ||||||
| Magnesium | 34.77±0.01 | 33.81±0.01 | 25.16±0.02 | ||||||
| Sodium | 29.85±0.02 | 29.33±0.02 | 21.61±0.01 | ||||||
| Zinc | 40.97±0.02 | 40.54±0.01 | 34.12±0.02 | ||||||
| Phosphorus | 21.21±0.01 | 20.13±0.02 | 15.03±0.02 |
Table 3: mineral elements (mg/100g) of raw and processed urena lobata leaves.
| Parameters | Raw | Oven dried | Boiled + oven dried | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Vitamin B1 | 1.95±0.02 | 1.70±0.01 | 0.80±0.03 | ||||||
| Vitamin B2 | 1.06±0.01 | 0.82±0.02 | 0.14±0.02 | ||||||
| Vitamin B3 | 3.79±0.02 | 3.45±0.03 | 1.66±0.01 | ||||||
| Vitamin C | 19.29±0.01 | 16.70±0.01 | 11.12±0.01 |
Table 4: vitamin analysis (mg/100g) of the raw and processed U. Lobata leaves.
Discussion
The decreased observed in the moisture content of the processed leaved of the U. Lobata may be a results of the shrinking of the call wall of the leaves during processing. The moisture content of the processed leaves is in line with the previous reports of Elijah, et al. [22]. The protein content recorded in this study were little bit lower when compared with the earlier values reports by Elijah, et al, [22], but higher when compared with the report of Igwe & Eleazu, (2017) [23].
The decreased protein content of the processed leaves could be attributed to the denaturation of some of the cellular protein during processing. There was an increased protein content when subjected to only oven dried, that is, oven drying of the raw leaves intensified the release of its nitrogen during acid digestion [24]. High protein content recorded in this study made it very vital to the animal as it is good for animal growth and increased milk production. Plant proteins are good source of food nutrient especially for the poor people living in developing or under-developed countries [25]. Proteins are one of the macromolecule and it can be seen as a substitute of energy sources when other sources of energy are not available. Food proteins are essential in making important hormones, antibodies, vital brain chemicals, digestive enzymes and essential elements, for DNA production. Some protein takes actives parts in structural support, while others involves in fighting against germs [26]. Therefore, urena lobata leaves can be seen as good sources of protein as they provide more than 12% calories value from protein. Thus, urena lobata leaves can be recommended to those searching for protein supplement.
The crude fibre content obtained in the study was higher when compared with the earlier report of Fagbohun, et al. [27]. But it was lower when compared to annona muricata leaves (22.20 ± 0.05) reported by Usunobun, Fibre cleaves the digestive track by dislodging tumours that are liable to cause cancer from the body and decreases the assimilation (intake) of cholesterol thereby help in safeguarding against cardiovascular disease, obesity, and colorectal cancer. Fibre helps to speed up the excretion of waste and toxics from the body, by preventing them from staying in the intestine for long time, which would have resulted to blockage and leads to different types of disease [28]. Suitable absorption of dietary fibre can decreased the serum cholesterol level, hypertension, diabetes, constipation, colon and breast cancer [29, 30].
Therefore, the increased fibre contents of urena lobata could be benefit to people suffering from cardiovascular disease, diabetes and obesity etc. U. Lobata had a range of lipids content of 8.41 ± 0.03 7.75 ± 0.03 which contributed to the energy value of _U. Lobata. Lipids enhance the palatability of food by assimilating and preserving the flavours [31].
Ash contents are a measure of the total mineral content of these plants. Values obtained in the currents study was lower when compared to the ash content of vitex doniana (11.50 ± 1.10) as reports by Vunchi, et al. [32]; but it was consistent with the value reported by Fagbohun. The decreased could be attributed to environmental factors and also leakage of some minerals into the boiling water [23].
The increased observed in total carbohydrates contents of oven dried and boiled + oven dried was a result of their loss of moisture during processing, while, the decreased of the total carbohydrate recorded on the raw leaves was due to the retention of the moisture as it was not subjected to any treatment before analyzing or it was analysed fresh.
Low oxalate content was observed in boiled + oven dried, while it was higher in raw and oven dried leaves. And this increased could be attributed to an adverse effect on calcium nutrient. It is known that oxalate chalets calcium to precipitate its deficiency due to its unavailability to the body.
Tannins are well known for its ability to prevent cancer as well as treatment of inflamed or ulcerated tissue [33, 34, 35].
Leaves that contain tannins as their component are astringent in nature and are used for the treatment of intestinal disorders such as diarrhoea and dysentery [36]. Saponnin in medicinal plants are responsible for most biological effects related to cell growth and division in human and prevent inflammation [33, 37, 38]. Saponnin have the properties of precipitating and coagulating red blood cell [23]. Other properties of saponnin may include formation of foams in aqueous solution, haemolytic activity, cholesterol binding features and bitterness [39, 40]. Both the raw and the processed forms contain the considerable amount of saponnin suggesting that both might possess the aforementioned properties.
Alkaloids are very essential to plant as it serve as predators and parasites [25]. Plant that posse considerable amount of alkaloid have been considered as medicinal plant as it has been used by the early man to relieve pains, as recreational stimulant or in religious ceremonies to enter a psychological state to achieve communication with ancestors or God [41, 42].
Flavonoid is one of the free radicals scavenger that inhibits oxidative cell damage, and strong anticancer activities [43]. And they could induce mechanism that affect cancer cells and prevent tumour invasion [44].
These activities might be as results of their capability to neutralize and stops free radicals [44, 45]. It could be also attributes to the presence of conjugated ring structures, redox properties and carboxylic group which have been reported to prevent lipid peroxidation [46].
Mineral, as inorganic elements are splinted into macro and micro elements. They function as co-factors in enzyme catalyzed reactions, regulation of acid-base balance, muscle irritability, nerve condition and structural elements of the body Eleazu & Eleazu [24].
Calcium, magnesium and phosphorus are macro- nutrients and they form essential constituent of the bone and teeth. Calcium functions as calmodulin bonding regulatory protein and mediates the excitation and contracting of the muscle fibre. Magnesium plays a crucial role in muscle relaxation [23]. Phosphorus plays a vital role in production of high energy compounds such as ATP, CTP, GTP, creatine phosphate and so on, as well as phosphate buffer system in the blood [24].
Zinc is an important constituent of many enzymes such as alkaline phosphates and helps in healing of wounds as well as essential in the regulation of insulin production by pancreatic tissue and glucose utilization by muscle and fat cells.
These vitamins are very important to the body as their deficiencies negatively affect the body metabolism. Vitamin B1 deficiency might cause cardiac failure, gastro- intestinal malfunction and weakness of muscle [47].
In vitamin B2, like thiamine and cobalamin (B12) acts as a coenzyme in breaking down of fats, protein, carbohydrate and other nutrients. It also assist fatty acid reduction and also essential for catabolism of nutrients in the liver as well as eye and skin maintenances [48, 49].
Niacin (vitamin B3) is necessary for the proper functioning of the skin, nervous system and intestinal track [24].
Vitamin C is one of the water soluble anti-oxidant. Vitamin that help to protects human tissue from been damaged by free radical.
Conclusion
The study showed that urena lobata leaves are rich in protein, fibre, ash as well as carbohydrates except in the raw leaves. Therefore these would be better sources of dietary carbohydrate, lipids and protein. It also revealed that raw leaves alone retained more of the nutrient than when it is been processed.
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