Int. J. Cur. Res. Physiol. Pharmacol.2523-6709Sumathi Publications Effects of Saccharum officinarum Molasses on Hematology and Hepatic Functions of Male Wistar Rats OGUNWOLE EUNICE eogunwole@unimed.edu.ng Kunle-Alabi Olufadekemi T mrskalabi@yahoo.com Akindele Opeyemi O opeyemiakindele@gmail.com Raji Yinusa yinusaraji@gmail.com UNIVERSITY OF MEDICAL SCIENCES, ONDO STATE Nigeria University of Ibadan, Ibadan, Nigeria Nigeria University of Ibadan, Ibadan, Nigeria Nigeria University of Ibadan, Ibadan, Nigeria Nigeria © 2022 The Author(s)2022This work is published under the Creative Commons License 4.0 (CC BY 4.0 ).210420226110120221304202221042022 Introduction

Sweeteners are a useful source of nutrients and epicurean facilitators for culinary preparation.1 Their constituents improve and keep food texture and quality.2 Refined sugar is a well-known non-lethal sweetener that is safe for use.3 However, studies have reported that it adversely affects human health by causing several forms of diseases.4,5This brought the idea of substituting sugar intake by most consumers with artificial (non-nutritive) sweeteners, since they contain just a few calories or are calorie-free but still duplicate the effect of sugar in taste.6 Studies however revealed that these artificial sweeteners also contribute to ill-health by increasing the risk of occurrence of colorectal cancer, body weight gain, diabetes, and obesity.7,8 As a result, a further search for suitable sweetening agents with lesser harmful effects, led to the discovery of other natural products believed to have improved nourishing value owing to their constituents.9

Saccharum officinarum molasses (SOM) is one of such natural sweeteners, gotten during the production of refined sugar from S. officinarum (sugarcane) juice. It is the main by-product obtained during the processing of sugarcane syrup.10Saccharum officinarum molasses from being used as a supplement energy source in animal feeds, for eradicating dust and reducing feed wastage11became a popular ingredient for sweetening beverages, basting, and flavoring of food products.12 Previous studies on S. officinarum molasses showed that it possesses antioxidant properties that prevented bone destruction and deoxyribonucleic acid damage.13,14 However, contradicting evidence correlated in vivo exposure of animals to S. officinarum molasses with immunosuppressive and endocrine-disrupting properties15 resulting in some diseases. Thus, this study investigates the effects of S. officinarum molasses intake on hematology, serum electrolyte level, lipid profile, liver histology, and oxidant status of male Wistar rats.

 Materials and methods

Ethical approval for this study (Ethical committee number UI-ACUREC/18/0074) was provided by the University of Ibadan Animal Care and Use Research Ethics Committee. All procedures comprising the use of animals were by the EU Directive 2010/63/EU for animal experiments and the study conformed to the Animal Research: Reporting of in Vivo Experiments (ARRIVE) guideline (2010).

The Saccharum officinarum molasses (SOM) (Blackstrap®, Old English Incorporated, USA) extraction was by the method of Gandhi, et al.16 resulting in two portions; SOM methanol fraction (SOMMF) and SOM aqueous fractions (SOMAqF) administered to the rats.

Acute oral toxicity test

The dosage regime for S. officinarum molasses extracts was by the Limit test procedure.17

Experimental design

Thirty-five male Wistar rats (160-180) gotten from the Central Animal House, University of Ibadan, Ibadan, Nigeria, and acclimatized for two weeks to laboratory conditions, were allowed access to feed and water ad libitum before the experiment began. The rats were randomly divided into seven groups (n=5) which received 1.0 mL/kg distilled water (group 1 - control); 1.0, 3.2, 10.0 mL/kgSOMMF (groups 2, 3, and 4) and 0.6, 2.0, 6.4 g/kg SOMAqF (groups 5, 6 and 7) daily by oral gavage for eight weeks, respectively. The dosage regime was by the Organization for Economic Co-operation and Development (OECD) test guideline.17 Distilled water was used as the vehicle for both extracts. Measurement of the body weights of the animals was done once a week and at sacrifice.

 Blood collection and serum preparation

At the time of sacrifice, blood was collected through the cardiac puncture into EDTA and plain serum bottles. The blood in the EDTA bottle was for the determination of full-blood indices with an automated hematology analyzer (MSLAB45, China). The blood in the plain serum bottles was allowed to clot for about 45 minutes, and centrifuged at 3000 rpm for 15-minute afterward, to get the supernatant which was stored at −20°C for electrolytes and lipid profile assessment (Randox kits, UK). Afterward, thiopental anesthesia (40 mg/kg i.p.) was administered,18, and the liver was exposed and harvested by opening the linea alba of the anterior abdominal wall to the thoracic cavity. It was fixed in 10 % formalin for histological examination.

 Electrolyte assessment

The serum electrolyte level assessment was by monoliquid colorimetric test using Randox kits (UK) in line with the manufacturer’s guide. The serum levels of zinc, sodium, potassium, Iron, and Inorganic phosphate were measured using a monoliquid colorimetric test. Calcium ion assessed with methylthmol blue (MTB) test.

 Lipid profile assessment

The assessment of serum lipid profile level (triglycerides, total cholesterol, and HDL cholesterol) was by enzymatic colorimetric test using Randox kits (UK) and low-density lipoprotein level (LDL) cholesterol was determined by Friedewald formula.

 Lipid peroxidation and antioxidant assessment

The liver lipid peroxidation assessment was done19 where the level of malondialdehyde (MDA) produced during lipid peroxidation was measured. Liver catalase activity20 Liver superoxide dismutase (SOD) activity21 was determined. The reduced glutathione level of the liver was measured by a spectrophotometric assay kit (Oxford Biomedical Research, USA).

 Histological assessment of Liver

The assessment of the liver was via routine techniques for histology. Samples underwent sectioning and staining with hematoxylin and eosin (H&E), the slides were cleared in xylene and mounted on the microscope for examination. Photomicrographs were at 100×magnification.

 Statistical analysis

Analysis of data was with GraphPad prism 5 and expressed as mean±SEM. The mean differences were compared by analysis of variance (one-way ANOVA) and p<0.05 was considered statistically significant.

 Results Effect of S. officinarum molasses on hematological indices

The result (Table 1) shows a significant decrease (p<0.05) in the packed cell volume (PCV) of groups treated with 3.2 mL/kg/day SOMMF, as well as 0.6 and 6.4 mg/kg/day SOMAqF when compared to the control, respectively. The 3.2 and 10.0 mL/kg/day SOMMF treated rats showed significant decreases (p<0.05) in red blood cell count relative to the control and SOMAqF treated rats. Significant decreases (p<0.05) were also noted in the hemoglobin concentration and mean corpuscular hemoglobin concentration of the SOMMF treated rats compared to the control, but the mean corpuscular hemoglobin concentration of the SOMAqF groups had a significant increase (p<0.05) as compared to the control. The mean corpuscular volume increased significantly (p<0.05) in 3.2 mL/kg/day SOMMF, nonetheless there were no significant differences in the mean corpuscular hemoglobin, white blood cell count, and platelet of all treated groups when compared to the control.

Effect of Saccharum officinarum molasses on hematological parameters.

SOMMF (mL/kg/Day) SOMAqF (mL/kg/Day)
Group Control 1.0 3.2 10.0 0.6 2.0 6.4
PCV (%) 43.0±1.155 43.33±1.41 35.83±2.06a 42.5±1.18 37.0±1.27a 41.67±1.12 38.67±0.84a
HB (G/dL) 17.15±0.58 14.52±0.50ab 11.93±0.68ab 14.62±1.11ab 17.9±0.309 17.67±0.29 17.2±0.58
RBC (10 6 µL) 8.49±1.31 7.84±0.22 6.19±0.60ab 7.58±0.36a 8.38±0.09 8.26±0.81 7.95±0.23
WBC 4.662±0.23 5.275±0.52 5.417±0.70 4.775±0.70 4.45±0.23 4.57±0.51 4.583±0.32
MCV(FL) 50.67±1.09 55.67±2.98 59.23±3.31ab 54.72±4.79 43.48±1.28 50.47±1.72 48.82±1.62
MCH( fmol ) 202.28±7.31 186.54±10.4 197.3±11.08 194.2±15.63 213.68±4.31 214.08±4.94 216.59±6.03
MCHC % 39.57±1.62 33.49±0.17a 33.3±0.03a 35.70±1.57a 48.57±1.34a 42.51±0.99a 44.67±2.15a
PLATELET 111500±415 110667±125 104833±984 109667±950 112167±430 109333±582 114333±277

Data are presented as mean±SEM, n=5. ap<0.05 compared with the control. bp<0.05 compared with SOMAqF. SOM= Saccharum officinarummolasses. SOMMF=Saccharum officinarummolasses methanol fraction. SOMAqF = Saccharum officinarummolasses aqueous fraction. PCV = packed cell volume. HB= Hemoglobin.RBC = Red blood cell. WBC=White blood cell. MCV=Meancorpuscular volume. MCH=Mean corpuscular hemoglobin. MCHC=mean corpuscular hemoglobin concentration.

 Effect of S. officinarum molasses on lipid profile

The result (Figure 2) shows there was a significant decrease (p<0.05) in serum triglycerol levels of 1.0 and 3.2 mL/kg/day SOMMF treated rats when compared to the control. Also, serum total cholesterol level was significantly decreased (p<0.05) in 1.0 and 10.0 mL/kg/day SOMMF when compared to the control. There were no significant differences in both the serum high and low-density cholesterol levels of all treated groups compared to the control.

Effect of<italic id="italic-411ea25dfd76184a65b1ac0e0c58a119"> Saccharum officinarum</italic> molasses on lipid profile level.

(Columns represent mean±SEM, n=5, ap<0.05 compared with the control. SOM=Saccharum officinarummolasses. SOMMF=Saccharum officinarummolasses methanol fraction. SOMAqF=Saccharum officinarummolasses aqueous fraction)

 Effect of S. officinarum molasses on some serum electrolytes levels

Serum level of zinc ion was significantly decreased (p<0.05) in all SOMAqF treated rats when compared with the control and SOMMF groups. Serum sodium ion level was significantly decreased (p<0.05) in 1.0 mg/kg/day SOMMF, 0.6 and 2.0 mg/kg/day SOMAqF treated rats compared to control and the 10.0 mL/kg/day SOMMF group. There were significant increases (p<0.05) in the serum levels of potassium and iron in 0.6 and 2.0 mg/kg/day SOMAqF treated rats in comparison with the control and all treated groups, respectively. Calcium and inorganic phosphate did not show significant differences in serum concentrations (Table 2).

Effect of Saccharum officinarum molasses on serum electrolytes levels.

SOMMF (mL/kg/Day) SOMAqF (mL/kg/Day)
Group Control 1.0 3.2 10.0 0.6 2.0 6.4
Zinc (Mmol/L) 25.37±5.803 26.35±5.947 23.54±3.114 25.32±3.11 22.0±3.346 ab 20.74±6.677ab 16.58±2.014ab
Sodium (Mmol/L) 108.3±5.65 73.58±11.08ac 110.8±15.25 124.9±17.73 48.15±4.65ac 53.41±10.36ac 106.7±3.874
Iron (Mmol/L) 41.13±2.828 42.52±5.088 46.8±3.509 54.06±6.058 51.68±6.57 64.51±10.99a 42.43±8.935
Potassium (Mmol/L) 3.966±0.253 3.209±0.538 3.302±0.490 3.854±0.259 5.246±0.865a 3.397±0.244 3.328±0.191
Calcium (Mmol/L) 8.191±0.343 6.932±0.241 8.866±0.878 8.773±0.691 8.165±0.516 8.302±0.707 7.992±0.307
Inorganic Phosphate (Mmol/L) 2.581±0.195 2.38±0.069 2.777±0.254 2.988±0.333 2.369±0.454 2.051±0.082 2.158±0.097

Data are presented as mean±SEM. n=5. ap<0.05 compared with the control. bp<0.05 compared with SOMMF.cp<0.05 compared with 10.0 mL/kg/day SOMMF. SOMMF=Saccharum officinarummolasses methanol fraction. SOMAqF = Saccharum officinarummolasses aqueous fraction.

Effect of S. officinarum molasses on lipid peroxidation and antioxidant enzymes of the liver.

The superoxide dismutase (SOD) activities of the lowest doses of SOMMF and SOMAqF treated rats significantly decreased (p<0.05) compared to the control and other treated groups. Catalase activity of 0.6 g/kg/day SOMAqF treated rats significantly increased (p<0.05) when compared to the control and SOMMF treated groups. There were no significant differences in the malondialdehyde (MDA) level and glutathione concentration (Table 3).

Effect of Saccharum officinarum molasses on lipid peroxidation and antioxidant enzymes of the liver.

SOMMF (mL/kg/Day) SOMAqF (mL/kg/Day)
Group Control 1.0 3.2 10.0 0.6 2.0 6.4
MDA (U/mg) 4.572±0.52 3.131±0.28 3.878±0.79 4.92±0.87 2.752±0.52 2.288±0.41 3.75±0.88
SOD (U/mg) 560.7±147.8 220.7±53.22abc 430±103.2 345.9±148.4 265.6±60.35abc 288.7±64.81 609.8±82.1
Catalase (IU/L) 698.2±62.94 539.3±44.62 676±65.25 771.5±158.6 1101±87.77a# 792.7±63.14 833.9±111
GSH ( uM /mg) 4.715±0.60 4.352±0.28 4.783±0.20 4.197±0.33 3.607±0.94 3.589±0.4 5.452±0.41

Data are presented as mean±SEM, n=5, ap<0.05 compared with the control. bp<0.05 compared with 3.2 mL/kg/day SOMMF, cp<0.05 compared with 6.4 mL/kg/day SOMMF, #p<0.05 compared with SOMMF. SOM= Saccharum officinarummolasses. SOMMF=Saccharum officinarummolasses methanol fraction. SOMAqF = Saccharum officinarummolasses aqueous fraction.

 Effect of S. officinarum molasses on histology of liver

The liver section of the 1.0 mL/kg/day SOMMF group shows mildly dilated sinusoids and infiltration of inflammatory cells. The liver sections of the SOMAqF groups show portal tracts with lymphocytes aggregating and mildly dilated sinusoids, as well as mild periportal infiltration of inflammatory cells in liver parenchyma (Figure 3).

Photomicrograph of liver sections of control rat and Saccharum <italic id="italic-1">officinarum </italic>molasses treated rats. a- control, b, c and d (1.0.3.2 and 10.0 g/kg SOMMF, respectively), e, f and g (0.6, 2.0 and 6.4 g/kg SOMAqF, respectively). Note the central venules (white arrows), normal sinusoids (blue arrows), hepatocytes (slender arrows). Mild perivascular and periportal infiltration of inflammatory cells (yellow arrows). Mildly dilated sinusoids with infiltration of inflammatory cells (green arrows). Lymphocyte aggregation (red arrows). Stained by H&E, ×100 magnification.

Discussion

The widespread use of S. officinarum molasses sweetener may cause concerns for possible adverse health effects, but this study reveals that it has a wide safety margin as there was no lethality even at a dose of 2000-mg/kg weight. Hematological components are valuable in monitoring general health status and changes in the blood due to toxicity.22,23Saccharumofficinarummolasses caused significant decreases in hemoglobin (Hb) concentration, red blood cell (RBC) count, and hematocrit/packed cell volume (PCV). Hemoglobin (Hb) is the iron-containing metalloprotein that transports oxygen to tissues for the breakdown of food substances for the release of energy used by the body and transport of carbon dioxide out of the body.24Red blood cell carries hemoglobin that combines with oxygen to form oxyhemoglobin during respiration.25,26The PCV is the percentage of RBC in blood and is also known as the hematocrit.27Thus, the significant reduction in hemoglobin, MCHC, RBC count, and PCV reveals that SOM may adversely alter the amount of oxygen that would be carried to the tissues and probably predispose to hypoxia.28,29The PCV, hemoglobin and mean corpuscular hemoglobin are major indices for evaluating bone marrow capacity to produce red blood cells, circulatory erythrocytes, and diagnosis of anemia.29,30The findings of this study support an earlier report that blood toxicity is usually accompanied by significant decreases in the values of RBC, HB, PCV due to possible suppression of erythropoietic processes or hemolysis of the available RBC.31This may also result in an anemic condition in line with the study of32 who noted that S. officinarum peel extract caused a decline in some of these blood indices.

Studies have shown that the amount, type, and composition of lipid sources in the diet are determining factors of the serum lipid profile.33,34Lipids have effects on cardiovascular functions and a change of diet is the first strategy applied to prevent and treat cardiovascular diseases.35Saccharum officinarum molasses is incorporated as a sweetener in both animal and human diets, this study shows that it caused a significant reduction in serum triglycerol and total cholesterol levels. It had been earlier stated that a 1 % decrease in serum cholesterol results in a 3 % decrease in risk of congestive heart disease.36SOM may be regarded as safe since it does not pose a possibility of an adverse effect on the heart as implicated by the decrease in the lipid profile.

The electrolytes in plasma contribute to the osmotic balance which controls the movement of water between cells and their environment.37Potassium is the major intracellular cation, it establishes the resting membrane potential in neurons and muscle fibers after membrane depolarization and action potentials.38Along with sodium, it regulates water balance and the acid-base balance in the blood and tissues. The observed inadequate changes in potassium and sodium ions levels, implied that prolonged consumption of higher doses of Saccharum officinarummolasses may cause hyponatremia or hyperkalemia and its related health effects. Serum iron concentration is a measure of the circulating iron (Fe3+)bound to transferrin, and only 0.1% of total body iron is bound to transferrin at any one time.39The slightly increased serum iron level by SOMMF is an indication that Saccharum officinarummolasses may help improve iron level due to its usefulness in the synthesis of oxygen transport proteins (hemoglobin and myoglobin), and for the formation of heme enzymes and other iron-containing enzymes involved in electron transfer and oxidation-reductions. 40,41

The ability of S. officinarum molasses to increase catalase activity is an indication that it possibly possesses some amount of antioxidant properties. Catalase is one of the main enzymes that act as an oxidant scavenger, via the degradation of hydrogen peroxide to oxygen and water.42 The perivascular infiltration and lymphocytes aggregation caused by SOMAqF may be from inflammation of either the neutrophils, eosinophils, lymphocytes plasmacytes, macrophages,or mast cells that infiltrate around the blood vessels. The portal tract’s inflammation probably resulted from deposits of blood clots or bleeding in the blood vessels.43,44The inflammatory cells in the hepatic tissue suggest that SOM may contain constituents that can interact with proteins and enzymes of the hepatic interstitial tissue interfering with the antioxidant defense mechanism to generate reactive oxygen species that may, in turn, imitate an inflammatory response.45Plausibly the observed mild dilation of the sinusoid was by peri-sinusoidal fibrosis nodular regenerative hyperplasia or hepatoportal sclerosis which has been related to xenobiotics.46,47

 Conclusion

Saccharum officinarum molasses increased serum levels of iron, potassium, and liver catalase, but adversely disrupted the lipid profile, hematological and hepatic functions of male Wistar rats. Saccharum officinarum molasses possess harmful effects on health status.

 Acknowledgment

We extend our gratitude to the staff of Multidisciplinary Central Research Laboratory at the University of Ibadan for technical assistance while conducting this study.

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