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Research Article
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Evaluation of Calorie Content of an All-natural Cane Sugar and Botanical Extract Sweetener: Studies in Wistar Rats

Sajan P.G. , Rohith T., Martin Tower, Prathap H.D.
American Journal of Food and Nutrition. 2020, 8(3), 54-60. DOI: 10.12691/ajfn-8-3-1
Received July 19, 2020; Revised August 21, 2020; Accepted August 30, 2020

Abstract

The purpose of the study was to evaluate the caloric content and biochemical effects of an all-natural cane sugar/botanical extract sweetener in comparison to reference glucose in Wistar rats. A total of 24 male Wistar rats aged 6-7 weeks, weighing 148-188 grams, free from disease, and possessing a functional health status were chosen for the study. The animals were divided into four sets and allocated to different treatment groups using a randomized block design. For the study, the test and reference substances were administered orally at approximately one-hour intervals from Day 8 until the end of the treatment period. A greater than 50% reduction (58.7%) of liver adenosine triphosphate (ATP) levels (a proxy for caloric content) was observed for the test item (TI) treatment group compared to the reference glucose group. In the preliminary oral glucose tolerance test (OGTT), treatment with TI at a dose of 5.8 g/kg bodyweight considerably decreased the normal post-prandial rise in serum glucose levels. Other biochemical parameters such as cholesterol, triglycerides, LDL, and VLDL also decreased in the test item high dose group as compared to the normal control (NC). The current study confirms a significant reduction in calories (>50%) and blood glucose levels in Wistar rats when cane sugar is combined with a formulation of botanical extracts. Based on these results, we feel that all-natural TI has potential as a reduced-calorie, low glycemic index (GI) alternative to standard sucrose and can be a valuable dietary aid in the fight against the global obesity epidemic and its associated metabolic disorders.

1. Introduction

Obesity has become one of the most significant current health care issues, with 39% of adults categorized as overweight or obese, thereby increasing comorbidity and lowering life expectancy 1, 2. It is a major contributing factor in many chronic medical conditions, including cardiovascular disease, diabetes, and cancer 3. Although the development of obesity is multicausal, the main factor is always a positive energy balance 4. Such positive energy balance results from an intake of energy from foods or beverages (calories), which exceeds the energy expenditure (including basal metabolism, thermogenesis, or physical activity) 4, 5, 6. Today, Americans consume 150-300 more calories per day than they did 30 years ago, and sweetened beverages account for 50% of this increase 7, 8.

A high intake of added sugar is associated with an excess calorie intake, which will increase body fat if not compensated for by energy expenditure 9. Sugar or sucrose cannot easily be replaced by other nutrients in solid or liquid foods to reduce calorie content without affecting functional properties. If sucrose is replaced with other carbohydrates, the taste may be negatively affected while the caloric value will not substantially change. However, the replacement may still affect blood glucose levels 10. If replaced by fat, the calorie content of solid foods will likely increase. In beverages, sucrose can be replaced by non-nutritive sweeteners, resulting in reduced energy content.

In contrast, in solid foods, it is challenging to reduce sucrose levels without changing technical properties and taste. Besides its sweetness, sucrose is key for bulk and texture, as well as for flavour formation. Currently, no commercially available sweetener exists that adequately duplicates the functional properties and taste of sucrose 11, 12, 13, 14. However, the consumption of sugar and its adverse health consequences are the subjects of considerable debate and controversy. A plethora of scientific studies has been published in the past decade related to sugars and their effects on human health and metabolism 15, 16, 17, 18, 19, 20.

Diabetes is rapidly emerging as a worldwide health epidemic in the 21st century. The increase in diabetes cases has paralleled the dramatic increase in worldwide obesity and insulin resistance 21, 22. This increase has prompted researchers to explore potential nutritional causes. Over consumption of sugars, primarily sucrose, has been targeted as a primary factor in diabetes 16. However, its relationship with type-2 diabetes is still not fully understood. Research into the connection between sugar consumption and type-2 diabetes is ongoing. Whereas most doctors argue that sucrose alone does not trigger diabetes, there is compelling evidence to suggest that the consumption of low GI and/or low-calorie foods minimizes large fluctuations in blood glucose levels 23, 24. It is hypothesized that Low GI foods affect weight control by promoting satiety and fat oxidation at the expense of carbohydrate oxidation 25.

Novel research has been carried out to prepare a reduced-calorie cane sugar product with the benefits of five botanicals. The test product used in the present study is cane sugar blended with a colorless, odorless, and tasteless solution prepared from aqueous extracts of five botanicals. The study’s objective was to evaluate the effect of herbal sweetener on liver ATP (adenosine triphosphate) or caloric content and metabolic markers in Wistar rats.

2. Materials and Methods

This study was undertaken by Vipragen Biosciences Pvt. Ltd, Mysore, Karnataka, India, with protocol number VBPL-P019/19. The Institutional Animal Ethics Committee (IAEC) approved all methods and procedures for the study. The experiments were conducted as per the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA) guidelines for the conduct of scientific experiments on animals, Ministry of Environment & Forests (Animal Welfare Division) Government of India, June 2007.

2.1. Preparation of Test Item (TI) All Natural Cane Sugar

A novel herbal extraction technology has been developed by using five herbs that is 100% water based. The proprietary process extracts desired materials from the five herbs over a semi-continuous process. The process of extraction requires precise control of temperature and processing conditions for optimal extraction of desired molecular values of efficacious materials. The herbal extract slurry is filtered seven times in a batch filtration step using multilayer cotton fibre filters. The final product after the seven stage filtration process will be a clear herbal solution. The water based herbal solution, crystal clear water without turbidity. Finally, all the solution is mixed in a specific ratio and diluted. After conditioning the solution a day, the mixture is again filtered. All natural cane sugar is manufactured by using a proprietary process wherein regular white sugar is reprocessed with the herbal solution.

2.2. Experimental Animals

A total of 24 male Wistar rats aged 6-7 weeks, weighing 148-188 grams, free from diseases, and with functional health status, were chosen for calorie determination. The Wistar rats were purchased from a CPCSEA-registered animal provider. The animals were housed under standard laboratory conditions, air-conditioned with adequate fresh air supply (10-15 Air changes per hour), room temperature 22 ± 3°C, relative humidity 30-70%, with cycles of 12 hours of light and 12 hours of dark in sequence. The animals were housed three per cage in standard polycarbonate cages. The cages were fitted with stainless steel mesh top grill having facilities for holding pellet feed and a drinking water bottle.

2.3. Study Design

The animals were divided into four groups, as presented in Table 1. Grouping of animals was done by the method of bodyweight (BW) stratification and randomization manually. Animals were allocated to different treatment groups using randomized block design, and it was ensured that there was no statistically significant difference in the body weight between the treatment groups. The animals from group G1 were designated as the NC. Only the feed vehicle was orally administered. In Group G2, the reference item (RI) was mixed with the vehicle and dosed per oral (PO). Groups G3 and G4 were test item (TI) doses, where low and high doses, respectively, of the TI were mixed with the vehicle and dosed orally.

A total of 3 male Wistar rats were chosen for the preliminary OGTT. Animal number 1 was an NC where only the vehicle was orally administered. Animal number 2 was designated RI glucose, and animal number 3, TI and both were dosed PO with a dose volume of 10 mL/kg BW. All animals were fasted overnight. The RI and TI were administered through the oral (gavage) route. The assignment of animals is presented in Table 2.

For the calorie determination study, TI/RI were administered orally at 20.0 mL/kg/bw once for the first seven days and 10.0 mL/kg/bw twice with the interval of approximately 1 hour from day eight until the end of the treatment period. The animals were treated daily with TI/RI for 17 days. For the preliminary study, TI/RI was administered orally at 20.0 mL/kg/bw once.

2.4. In-life Observations and Measurements

The animals were observed twice daily and once during holidays for morbidity and mortality for the duration of the study period. All the animals were observed for TI treatment-related clinical signs of toxicity. The animals were observed for adverse effects on the respiratory, cardiovascular, gastrointestinal, and nervous systems. All animal bodyweights were recorded every two days during the treatment period. The quantity of feed consumption was also measured every two days. The amounts of feed offered and remaining were recorded for each cage, and feed intakes (g/rat/day) were calculated.

Fasting blood samples were collected on days 1, 8, and 18. The blood samples were collected after overnight fasting from the retro-orbital sinus under isoflurane-oxygen anaesthesia. Fasting glucose was estimated on days 1 and 8 using a biochemical analyzer and on days 11 and 18 with a glucometer by using a drop of blood from the tail vein. The clinical chemistry parameters calculated at the end of the study period were fasting glucose, glycated haemoglobin (HbA1c), total cholesterol (CHO), triglycerides (TRI), high-density lipoproteins (HDL), low-density lipoproteins (LDL) and very-low-density lipoproteins (VLDL).

2.5. Liver ATP Estimation

Animals were sacrificed by isoflurane-oxygen euthanasia. Livers were collected, weighed, flash frozen in liquid nitrogen and subjected to tissue ATP estimation using a Kit Method (Kit: BioVision Inc. Catalog #K354-100; ATP colorimetric Assay). Tissue samples were homogenized and centrifuged ice cold at 15,000×G for 2 minutes and supernatant was collected. The reaction mix was then added to each well containing the ATP standard and test samples and incubated at room temperature for 30 minutes, protected from light. The optical density reading was measured at 570 nm in a micro-plate reader. Tissue ATP levels were calculated for each animal and the mean value and standard deviation was tabulated for each group. The % change was calculated with respect to the vehicle treatment group.

2.6. Necropsy

Throughout the study period, no unscheduled deaths of animals were observed. All the animals were euthanized using an overdose of isoflurane at the conclusion of both preliminary and primary studies. The rats from the primary study were subjected to a complete necropsy examination, which included an evaluation of external and internal gross necropsy observations. The gross pathological examination was made and recorded. All animals in the study were subjected to a full, detailed gross necropsy, including careful examination of the body’s external surface. This examination included all orifices of the cranial, thoracic, and abdominal cavities and their contents. Organs such as adipose tissue, brain, heart, kidneys, liver, pancreas, and spleen from the main study were washed with phosphate-buffered saline, and weights were recorded.

2.7. Statistical Analysis

Statistical analyses were performed using GraphPad Prism software version 7.04. Data for each group of animals were subjected to a one-way analysis of variance (one-way ANOVA). Data is expressed as mean ± standard deviation (SD). All analyses and comparisons were evaluated at the 5% (P≤0.05) level.

3. Results

3.1. Clinical Observation and Mortality

There was no treatment-related mortality or clinical signs of toxicity observed during the study in any of the treated or control groups. None of the rats showed signs of toxicity in their skin, fur, eyes, salivation, behaviour, or sleep.

3.2. Body and Organ Weight

Bodyweight gains in the TI groups were comparable to that of the NC. The TI groups showed a decrease compared to both the NC and RI. In the TI groups, bodyweight varied throughout the study due to individual rat behaviour, but all rats exhibited a net decrease in bodyweight over time. The relative weight of each organ recorded at necropsy in the treatment groups did not show a significant difference (p > 0.05) compared to the NC. The bodyweights and organ weights of rats are presented in Table 3 & Table 4, respectively.

3.3. Clinical Pathology

For the main study animals, fasting glucose was measured on day 1 (pre-treatment), day 10 (treatment), and day 17 (post-treatment). The results showed that the TI-high dose treated rats are comparable with the NC as well as with the RI. It was interesting to note that parameters such as cholesterol, triglycerides, LDL and VLDL were significantly decreased in TI-high dose treated rats when compared to the NC and RI. The HDL result was comparable with the normal control, whereas significant decreases were observed in the HbA1c levels of both TI groups in comparison with the RI. The summary of fasting glucose levels and biochemical parameters are presented in Table 5 & Table 6, respectively.

In the OGTT study, the blood glucose values of the TI group were comparable to the NC from 0.0 hr to post-treatment up to 4.0 hr. However, there was a considerable reduction of blood glucose in the TI group compared with the RI. After 1.0 hr, blood glucose was 175mg/dL in the RI group, whereas it was 112mg/dL in the TI group. The maximum blood glucose value in the RI group was 185mg/dL, compared with 118mg/dL in the TI group. The reduction in blood glucose values in TI-treated rats is attributed to the effect of the potent herbal extract formulation. The glucose values are presented in Table 7.

3.4. Liver Samples for ATP Analysis (Caloric Content)

Liver ATP levels (caloric content) in both TI groups were comparable to the NC, whereas the RI group showed significantly higher ATP levels (caloric content). It is interesting to note that greater than 50% of reduction in liver ATP in the TC High dose group as compared to the RI. These results suggest that rats consuming high carbohydrate TI do not experience an increase in glucose level due to the influence of the botanical ingredients. A summary of liver ATP values is presented in Table 8.

4. Discussion

The present study investigated the effects of test item (TI) on liver ATP, glucose profile, and other biochemical markers throughout the postprandial periods in Wistar rats. The TI is all-natural cane sugar (sucrose) blended with botanical extracts and is a nutritive source of carbohydrates and energy.

In the preliminary OGTT study, the blood glucose values of TI were comparable to a NC from 0.0 hr to post-treatment up to 4.0 hr. In the OGTT, TI treatment at a dose of 5.8 g/kg body weight significantly suppressed the rise of blood glucose by inhibiting the activity of disaccharides in the small intestine of rats. We observed an approximately 70% inhibition of the rise in blood glucose levels after TI treatment compared with the RI. Several studies have reported that plant extracts inhibited the activity of α-glucosidase 24, 25, 26. Glucosidase is an enzyme required for the metabolism of non-absorbable oligosaccharides into absorbable monosaccharides in the small intestine. Photochemical screening test results showed that the botanical ingredients in TI contain saponins, flavonoids, polyphenols and antioxidants. These compounds are known to reduce the risk of diabetes, increasing tyrosine phosphorylation activity and by decreasing phosphatase-mediated insulin receptor inactivation, peripheral glucose utilization and stimulate insulin release and potentiate the effects of insulin 26, 27. They may also be responsible for the lack of a rise in blood glucose levels in TI-treated rats. Therefore, the glycemic control exerted by TI can be attributable to α-glucosidase inhibition. Additionally, the ingredients integrate with mitochondrial function, thus improving hepatic metabolism during insulin resistance and metabolic syndrome 28. By monophosphate-activated activation, it decreases the , and maintains blood pressure 29, 30. The glycemic profiles for glucose and TI are graphically presented in Figure 1.

The second significant finding came by comparing the liver ATP levels of glucose-treated and TI-treated rats. The study showed a significant decrease in liver ATP levels (>50%, caloric content) in Wistar rats treated with TI compared to those treated with glucose. ATP is an energy-carrying found in the cells of all living things. Sucrose is catabolized to glucose and fructose in the small intestine with the help of the enzyme sucrase. Glucose is metabolized into pyruvate through glycolysis in the cytoplasm, and pyruvate is wholly oxidized to generate ATP through the tricarboxylic acid (TCA) cycle and oxidative phosphorylation in the mitochondria. Fructose metabolism occurs entirely in the liver. Through a complicated process called fructolysis, fructose undergoes several chemical and structural changes with the help of aldolase B, an enzyme in the liver. In the RI group, the ATP measured is 2.61µmol/g, whereas, in the NC, it is 1.38µmol/g. However, in the TI group, the ATP measured is 1.08µmol/g. The reduction of ATP in this group is due to either incomplete digestion of TI in the intestine or by not being fully absorbed in the blood. The botanical ingredients blended with cane sugar were capable of inhibiting sucrose digestion. Consequently, the calories were also reduced in TI-treated rats. The herbal solution contains a unique blend of bioactive components including saponins, flavonoids, polyphenols and antioxidants. This may be attributed to the fact that TI digestibility decreased as bioactive components present in it. Because of TI resist digestion and absorption, it may or may not undergo microbial fermentation in the large intestine. These mechanisms appear to decrease nutrient absorption, therefore, decreasing metabolizable energy. The summary of liver ATP data is presented in Figure 2.

A further finding of our study was a decrease in body weight (8%) in the TI group after the 17-day trial in comparison with the RI group. The present study showed a significant decrease in triglycerides, total cholesterol, and LDL-cholesterol in TI high dose treated rats. These decreases might be due to an increase in insulin, which caused an increased activity of lipoprotein lipase and a decreased activity of hormone-sensitive lipase 31. Collectively, these data supported the reduction in liver ATP in TI treated rats. Further research is necessary to understand the mechanism of calorie reduction and glycemic index in humans.

5. Conclusions

In this study, the metabolic effects of consumption of an all-natural, cane sugar/botanical extract sweetener (TI) was evaluated in male Wistar rats. The preliminary finding of this study is a greater than 50% (58.7%) decrease in ATP levels (caloric content) in the TI treatment groups as compared to the reference item glucose. The study also showed decreases in serum glucose, cholesterol, triglycerides, LDL, VLDL, and HDL levels. The daily consumption of the TI for 17 days did not cause any adverse effects during the study period. The OGTT test was well tolerated and blood glucose levels returned to baseline post-treatment. Based on these results, we feel that this all-natural sweetener has potential as a reduced-calorie, low GI alternative to standard sucrose and can be a valuable dietary aid in the fight against the global obesity epidemic and its associated metabolic disorders. Further study is therefore required to test its effects on both healthy humans and those with metabolic disorders such as Type 2 Diabetes.

Acknowledgements

The authors would like to express thanks to Kumaraswamy MV and Vipragen Biosciences Pvt. Ltd, Mysore, Karnataka, India, and all the participants involved in the study and data acquisition.

Conflicts of Interest

The authors declare that they have no conflict of interest.

Abbreviations

ATP: Adenosine Triphosphate (ATP)

BW: Body Weight

CHO: Total Cholesterol

CPCSEA: Committee for the Purpose of Control and Supervision of Experiments on Animals

GI: Glycemic Index

HbA1c: Glycated Haemoglobin

HDL: High Density Lipoproteins

IAEC: Institutional Animal Ethics Committee

LDL: Low Density Lipoproteins

NC: Normal Control

OGTT: Preliminary Oral Glucose Tolerance Test

PO: Per Oral

RI: Reference Item

TI: Test Item

TRI: Triglycerides

VLDL: Very Low Density Lipoproteins

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Published with license by Science and Education Publishing, Copyright © 2020 Sajan P.G., Rohith T., Martin Tower and Prathap H.D.

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Sajan P.G., Rohith T., Martin Tower, Prathap H.D.. Evaluation of Calorie Content of an All-natural Cane Sugar and Botanical Extract Sweetener: Studies in Wistar Rats. American Journal of Food and Nutrition. Vol. 8, No. 3, 2020, pp 54-60. http://pubs.sciepub.com/ajfn/8/3/1
MLA Style
P.G., Sajan, et al. "Evaluation of Calorie Content of an All-natural Cane Sugar and Botanical Extract Sweetener: Studies in Wistar Rats." American Journal of Food and Nutrition 8.3 (2020): 54-60.
APA Style
P.G., S. , T., R. , Tower, M. , & H.D., P. (2020). Evaluation of Calorie Content of an All-natural Cane Sugar and Botanical Extract Sweetener: Studies in Wistar Rats. American Journal of Food and Nutrition, 8(3), 54-60.
Chicago Style
P.G., Sajan, Rohith T., Martin Tower, and Prathap H.D.. "Evaluation of Calorie Content of an All-natural Cane Sugar and Botanical Extract Sweetener: Studies in Wistar Rats." American Journal of Food and Nutrition 8, no. 3 (2020): 54-60.
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[1]  World Health Organization Obesity and Overweight. Fact Sheet, 2008. Available: http://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight.
In article      
 
[2]  McNamara, J.M., Houston, A.I., Higginson, A.D., “Costs of foraging predispose animals to obesity-related mortality when food is constantly abundant”. PLoS One, Vol. 10(11): e0141811, 2015.
In article      View Article  PubMed
 
[3]  Johnson, R.J., Sánchez-Lozada, L.G., Andrews, P., Lanaspa, M.A., “Perspective: a historical and scientific perspective of sugar and its relation with obesity and diabetes”. Advance Nutrition, vol. 8, 412-22, 2017.
In article      View Article  PubMed
 
[4]  Kramer, C.K., Zinman, B., Retnakaran, R., “Are metabolically healthy overweight and obesity benign conditions?: a systematic review and meta-analysis”. Annals of Internal Medicine, vol. 159, 758-769, 2013.
In article      View Article  PubMed
 
[5]  Spiegelman, B.M., Flier, J.S., “Obesity and the regulation of energy balance”. Cell, vol. 104, 531-543, 2001.
In article      View Article
 
[6]  Hummel, E., Witting, F., Schneide,r K., Gebhardt, N., Hoffmann, I., “The complex interaction of causing and resulting factors of overweight/obesity. Increasing the understanding of the problem and deducing requirements for prevention strategies”. Wissensschaft & Forschung, vol. 60, 2-7, 2012.
In article      
 
[7]  Briefel, R.R., Johnson, C.L., “Secular trends in dietary intake in the United States”. Annual Review of Nutrition, vol. 24, 401-31, 2004.
In article      View Article  PubMed
 
[8]  Nielsen, S.J., Siega-Riz, A.M., Popkin, B.M., “Trends in energy intake in U.S. between 1977 and 1966: Similar shifts seen across age groups”. Obesity Research, vol. 10, no. 5, 370-378, 2002.
In article      View Article  PubMed
 
[9]  Morenga, L.T., Mallard, S., Mann, J., “Dietary sugars and body weight: systematic review and meta-analyses of randomised controlled trials and cohort studies”. BMJ Clincial Research, vol. 346:e7492, 2013.
In article      View Article  PubMed
 
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