INTRODUCTION:

As a major food crop, starch is mostly farmed and consumed in Oceania, Sub-Saharan Africa, and East Asia. China accounts for 76.07% of the global supply of this crop. People eat "Sweet Potato Leaves" (SPL) because of their great yield, drought resistance, and adaptation to many climatic conditions and farming approaches. In addition to its nutritional qualities, SPL has been found to be a functional food with a number of bioactive compounds that provide a range of health-promoting effects. High concentrations of polyphenols, flavonoids, and carotenoids have been linked to health benefits, according to a large body of research on SPL functional components. Numerous bioactivities are possessed by these substances, such as hepatoprotection, immunological modulation, anti-cancer, and anti-mutagenic properties¹.

The most plentiful source of carbohydrates found in plant starch is a naturally occurring byproduct of photosynthetic processes in plants. Many plant components, including the leaves of green plants, seeds, fruits, stems, roots, and tubers of most plants, chemically store solar energy that is then made available to non-photosynthetic species, the majority of which are humans ³. Six-carbon-ringed glucose molecules make up the polymeric molecule known as starch^4-7. It is produced by different plants as discrete granules with distinct morphologies, and its molecular weight ranges from 104 to 107 Daltons^2,3-14. Starch is produced by the amyloplasts of seeds, fruits, and tubers as well as the chloroplasts in green leaves. Starch can be found in cereal grains like corn and wheat as well as in the widely spread polysaccharides.

Sweet potatoes are a plant that belong to the Convolvulaceae family (Ipomoea batatas [L.] Lam). For many countries, its production and culture are essential because they reduce food shortages during emergencies (conflicts or natural catastrophes). Producing more than 90 million tons a year, it's one of the world's most important, versatile, and neglected food crops. The bulk of this production is accounted for by Asia and Africa, especially China. More than 100 countries cultivate sweet potatoes, which are regarded as a very significant crop in many parts of the world⁵. Furthermore, it is a significant food crop in tropical and subtropical regions, increasing production and consumption and providing nutritional benefits to both rural and urban populations. While sweet potato production has decreased globally over the past ten years, it has increased in China, Bangladesh, Sub-Saharan Africa, and the United States. Since China produces 80% of the world's sweet potatoes, its rapid economic expansion is the main reason for this decline in sweet potato production worldwide⁶. People may now access a wide variety of fruits, vegetables, and almost any form of food year-round because of this progress. There is also a variety of colors available for sweet potato skins, including white, cream, yellow, orange, pink, red, and as well as purple. The flesh might be white, or it can be cream, yellow, orange, or even purple in different tints. Sweet potatoes are reported to have high levels of polyphenols, terpenoids, saponins, glycosides, alkaloids, steroids, and other beneficial bioactive substances. The most prevalent bioactive components include phenolic acids, such as caffeic acid and monocafeoyl quinic (chlorogenic acid), phenolic derivatives of caffeoylquinic acid (CQA), primarily di-, mono-, and 3,4,5-tri-CQA, and p-coumaric acid. Drought-tolerant sweet potatoes are a staple crop that can contribute to food and nutritional security in many regions of the world. Considering its high nutritional content and profusion of bioactive ingredients.

Modifications are done to ensure that the finished goods have the right qualities in addition to altering the physicochemical properties of starch and enhancing its technical utility.

But not every application is suitable for starch because of a few characteristics. The majority of native starches cannot be applied directly to surfaces due to their great susceptibility for degradation and retrogradation as well as their low water solubility. They also exhibit substantial instability to temperature, pH, and shear force variations¹⁵. Thus, enzymatic, chemical, and physical methods are frequently used to modify starches. The purpose of these alterations is to enhance certain properties, such as mechanical strength, adhesion, solubility, hydrophobicity, thermal stability, amphiphilicity, paste clarity, and endurance to high temperatures, that are necessary in an industrial setting.

2. MODIFICATION OF STARCH:

2.1 Physical modification:

Thermal and nonthermal physical therapy are the two main categories. Heat is used in thermal treatments to change the length of the chain and the amylopectin: amylose ratio. This usually results in extremely soluble excipients, which gelatinize under such temperature circumstances, increasing their swell ability and solubility. As a result, starch made in this way is easily plasticized and useful for super disintegrants and the creation of antimicrobial films. Pregelatinization, heat-moisture treatment, annealing, dry heating, and osmotic pressure therapy are examples of thermal treatments¹⁶. Pregelatinization is the process of heating starches to a specific temperature and then drying them to reduce or eliminate molecular reassociation. The process of heat-moisture treatment involves heating starch granules for one to twenty-four hours at a temperature higher than the starch's glass transition temperature under adiabatic conditions and a relative humidity of 10–40%. A-type crystallinity is absent from the modifications seen, whereas B-type starch granules transform into C-type. However, increased crystallinity is only a desired feature in formulations intended for sustained release^17-19. The nonthermal treatment includes ultrasonic treatment, milling, high-pressure treatment, pulsed electric field, freezing/thawing, and freeze-drying treatment.

2.2 Chemical modification:

In order to provide the starch special qualities, a new functional group must be inserted onto its backbone. Although there are many techniques for chemical modification, oxidation, grafting, cross-linking, acetylation, acid hydrolysis, and dual modification are the most important ones.

2.3 Enzymatic modification:

The objective of the enzymatic modification of starch is amylopectin, which encompasses the molecular weight, length, and makeup of the amylose chain. In general, when the aforementioned factors are reduced, the modified starch can be used to produce fast-releasing micro- and nanoparticles. utilized as a substitute in the preparation of tablets with quick release. However, the modification prevents the starch granules from swelling, so it cannot be used as a disintegrant. Enhancements in some applications of modified starch for medicine delivery. Starch has been modified to provide controlled medication distribution in drug delivery devices. The numerous alterations of the modified starch, such as acid modification, pre-gelatinization, freeze-drying, cross-linking, and hydroxypropylation, affect its binding and disintegration characteristics. This could then affect the rate of discharge. To prepare metronidazole tablets, rice starch was changed by carboxylation and oxidation [20]. It was discovered that the starch's enzymatic and pH resistance, which produced a slow-release with a prolonged effect, provided a regulated release mechanism.

The thermo sensitivity of a starch derivative in a drug delivery system was recently studied. Butyl glycidyl ether-treated acid-hydrolyzed starch was combined with prednisolone to micelles. After that, the in vitro dissolution profile of these micelles was studied in distilled water at 20 and 40°C. It was shown that at 20°C, 38% of the medication was released, and at 40°C, 90% of it^21-30. This release was explained by the modified starch's molar substitution (MS) and lower critical solution temperature (LCST). After the previously described components were analyzed and shown to be inversely proportionate, the LCST reduced from 32.5 to 4°C when the MS was doubled from 0.32 to 0.67. The micelles are impacted by this rise in molar substitution, which causes swelling and regulated release. The impacts of the several modifications on the intrinsic properties of native starch up to the point of predicted usage are not compiled directly. Furthermore, the food and pharmaceutical industries are using more naturally occurring antioxidants based on polyphenols. Considering that phenolic compounds have However, choosing the right extraction method is challenging due to the large fluctuations in the polarity of the phenolic compounds. But most of these procedures depend on the solvent's capacity to extract various solvents at various temperatures and for longer durations of time. Due to the fact that oxidation, ionization, and hydrolysis can all reduce the overall phenolic content and diseases associated with antioxidant activity⁶. A summary of the nutritional value, health benefits, phytochemical composition, and possible medical applications of sweet potatoes. This paper examines the therapeutic research, potential medical uses for sweet potatoes, the pharmacological effects of sweet potato extract.

3. PICKERING EMULSION:

Emulsion systems are used in many industries, such as the food, pharmaceutical, medical, and cosmetic ones. But the relationship between oil and water is inherently unstable and will eventually fail. Because starch is easily obtainable, inexpensive, non-allergic, and biodegradable, it is considered a good substitute for emulsion stabilization. Emulsion stabilizers, such as starch, have been used to stabilize solid stable emulsions, often referred to as Pickering emulsions. Because of the practically irreversible adsorption of the particulate stabilizer interface, Pickering emulsion is made up of solid particles that have been utilized to stabilize the oil-water interface. Adding particles, such as bio-based starch-based particles, is a novel way to stabilize emulsions in food. Several investigations have demonstrated that physical. Pickering emulsion has been stabilized with the use of hydrophobic modifier. These sugars. Wei et al. state that when nanoparticle sizes spread, the Pickering emulsion becomes more stable. A large number of particles adsorbed to the interface in a different study, creating a physical barrier that produced tiny droplets. This meant that the Pickering emulsion's longevity was unaffected by either a high concentration of total nanoparticles or a low oil ratio. Miao et al., claim that high-branching SNPs are required for the. A sweet potato leaves support the growth of the body and are an excellent source of nutrients, such as amino acids and protein.³⁴

4. LITERATURE REVIEW:

Szylit et al., (2000) reported testing of three tropical tubers in vitro or in vivo in tureens or chickens to assess the effects of tuber nature as well as treatment on urea, breakdown of starch in the crops, and developing chicken performances. Cassavas (Manihotutilissima) along with its starch had an A-type X-ray scattering pattern and are hence equivalent to cereal starch. These starches being well broken down in vitro and were an excellent source of energy for rumen bacterial growth in with the addition of a-amylase from B. subtilis by growing chicken. Sweet potato fermentation in rumen and crop produced more acidity than cassava fermentation with food consumption³¹.

Shariffa et al., (2015) investigated how light heat treatment affected the granular starch's sensitivity to enzymes hydrolysis. A combination of fungus a-amylase as well as glucoamylase was used to enzymatically hydrolyze the starches of tapioca and sweet potato at 35°C for 24 hours. After being heated below the gelatinization temperature half hour, starches were hydrolyzed in their natural (granular) condition. The surface of the starch granules was where enzymatic erosion mostly took place, according to analysis using scanning electron microscopy. For both starches, the amylose concentration, swelling ability, and solubility exhibited negligible increases. Boosting the degree of hydrolysis of granular starch required heating treatment below the gelatinization temperature³².

Ferrari et al., (2018) studied on various operating settings including configurations associated with the bioethanol production industrial process, the energy demand of an experimental cultivars of sweet potato was examined. A procedure simulation prototype was created using the “SuperPro Designer” program. The prototype was created utilizing investigational statistics from the lab testing as well as data from technology and equipment sources. Separate analyses were performed on the effects of sweet potato dry matter proportion to water, fermenting efficiency, along with sweet potato sugar content on usage of energy. Every variable was relevant. When working with fresh sweet potato, the ideal dry matter to total water ratio was 200 grams dry sweet potato/kg water, with higher ratio not resulting in a significant reduction in energy usage³³.

Natural plant mucilage has surpassed synthetic mucilage in terms of toxicity, cost, and availability, according to OnyishiIkechukwu V. et al. The study's goal was to find inexpensive and effective natural raw materials that might be used as alternate suspending agents in the origination of acetaminophen solution. Rheological characteristics, sedimentation profiles, and stability investigations were performed on the suspensions. It was revealed that carbs, protein, saponin, reducing sugar and flavonoids were present. The suspension's rheological characteristics demonstrated that raising the concentration improved the viscosity inside the solution, while increasing the ambient temperature failed to alter (p 0.05). These results reveal that mucilage from sweet potato has a relatively low suspension proportion, average consistency, and is moderately dispersible in acetaminophen solution, and can thus be employed as a suspending element in formulations comprising sparingly soluble drug suspensions³⁴.

Pandi et al., (2021) investigated Non-traditional feedstuffs are increasingly commonly employed in chicken diets in developing countries, where imported grains constitute the majority of the components used in the production of commercial poultry stock feed. The aim of study is to explore the ability of the roots of sweet potato as an element in chicken feed, where the corresponding crop is plentiful. It discusses the crop's metabolizable energy value in comparison to maize, as well as its effect on broiler intake when prepared differently and supplied at varying inclusion rates. The main anti-nutritive component found in sweet potato roots is trypsin inhibitors, which are removed by heat and moisture treatments³⁵.

Chhe et al. (2013), evaluated change in the enzymes and physical and chemical characteristics of sweet potato treated using a combination of before heating as well as “high-temperature blanching”. The results also revealed that a temperature of more than 94°C was preferable for efficiently inactivating peroxidase. Second, the best circumstances for pre-heating treatment were determined by considering quality qualities. Temperatures above 65°C, on the other hand, had some negative impacts on nutrition and aesthetics.Pre-heating at the temperature of 60°C for 40 minutes was eventually chosen as the optimal conditions for sweet potatoes slice³⁶.

Qing Lv et al. (2005), Heat-moisture treatment (HMT) and octenylsuccinylation (OSA) were combined to modify sweet potato starch (SPS) in a way that was claimed to increase the degree of substitution (DS). Because the OSA concentration was higher than 6%, HOSA-SPS had higher SDS and RS than OSA-SPS. While OSA modification had the opposite impact, HMT reduced the power of starch swelling (p0.05). SEM examination showed that while the OSA modification had a small impact on the structure, it degraded starch. The beginning, peak, and end gelatinization temperatures of starch were increased by HMT, whereas they were decreased (p<0.05) by OSA modification^37-53. Zhu et al., (2018) reported the use of ultrasound technology to modify the physicochemical properties of food systems is growing. For up to 20 hours, the impact of ultrasonication on the physicochemical parameters of two types of sweet potato flour was examined and contrasted with those of commercial wheat flour. The structural aberrations in starch granules caused by ultrasound mainly involved morphological alterations and a decrease in crystallinity. As raw wheat was digested in vitro to increase its starch content, a longer treatment period decreased the entropy change of the gelatin pasting viscosity and gelling property. Moreover, cavitation-induced pyrolysis and hydroxyl radical release decreased sweet potato flour's total phenolic percentage and in vitro antioxidant efficiency. It was found that the magnitude of these alterations varied with time, suggesting that the chemical components of flour underwent degradation and modification.

5. DISCUSSION:

Sweet potato is becoming more widely recognized as a substantial source of distinctive natural components, including substances that may be castoff in the improvement of treatments for various disorders and the production of industrial product (Figure 1). The general goal of this paper is to provide a high-level overview of sweet potato nutritional value, health advantages, phytochemical makeup, and therapeutic capabilities. To improve sweet potato blanching operations, we explored pre-heating earlier of the high-temperature blanching. Although sweet potato is suited for processing, data on endogenous enzyme is limited. Therefore, the findings presented here shall be useful in future research on sweet potato processing and cooking. Furthermore, the data indicated that blanching at temperatures greater than 94 °C was more successful at inactivating POD.

Figure 1: Shows the Health Benefits of Sweet Potato ³⁹.

The biochemical properties of some of the sweet potato-derived elements that were recently sequestered, the pharmacological effects from its extract, experimental research, and likely medicinal application of sweet potatoes, demonstrate the impending of sweet potatoes as a therapeutic food. This work aims to collect data on the energy used in the creation of ethanol from sweet potatoes in order to implement used for farming genetic enhancement initiatives and make decisions regarding the commercial-scale enactment of procedures that allow the spare of fossil fuel in the self-propelled industry⁴⁰.

Human diets usually include SPL, and numerous studies have been conducted to examine its beneficial effects on health. Conversely, there hasn't been much focus on contrasting the in vivo effects of SPL with the outcomes of in vitro research. Karna et al.¹¹ shown the anticancer effect of SPL against prostate cancer both in vitro and in vivo. The polyphenol-rich SPL extract reduced clonogenic growth, disrupted cell cycle progressions, and induced apoptosis in prostate cancer PC-3 cells by modifying the cell cycle and apoptosis regulatory molecules. SPL was reported to reduce oxidation in a different study⁴¹. There was a relationship between SPL's antioxidant activity and total TPC. In vitro and ex vivo studies by Chen et al. examined SPL has been shown to suppress angiogenesis among human umbilical endothelial cells that line the vascular system. The in vitro and ex vivo results did not agree. SPL was found to be pro-angiogenic in the ex vivo investigation, but in vitro, the methanol extract was anti-angiogenic. This might be because leaf metabolites in human blood and leaf extract have distinct chemical compositions, which would otherwise have the opposite effect⁴². Mathematical models established through investigations usually do not describe the relationship between in vitro and in vivo outcomes. Thus, further investigation is required to examine that relationship. An investigation into the effects of using cultivars with high NSP contents on the intestinal health and digestive capacity of hens is necessary in order to support its usage in broiler meals. Previous studies on particular PNG cultivars described in this study indicate that some of these effective inventions of artificial seed from condensed plant propagated of several plants. The right plantlets were produced once procedures were optimized. The plant species used in the first phase determines how far this procedure will develop. However, despite the advantages of artificial seed, more research is required to improve the root-growth potential of non-embryogenic artificial seeds. To improve a given plant species' capacity for artificial seed cryopreservation, more thorough research is needed. Using the right kinds and dosages of antibiotics and anti-disease agents could help with this. The optimal steaming time for higher SDF content was determined by measuring the SDF contents of sweet potatoes cooked for different amounts of time. The cellulose fraction was influenced by the textural properties and the concentration of soluble pectin. Meanwhile, modifications to the composition and structure of cell walls are the primary source of the variation in fruit texture. Similar results were seen in this investigation: there was a stronger correlation between textural features and cell wall composition than.

6. CONCLUSION:

SPL are commonly used in home cooking and are a part of human diets, so it's important to understand how cooking changes the amount of polyphenols in SPL and their antioxidant activity. A multitude of complex elements can influence the quality of eating sweet potatoes uncooked. When determining whether sweet potatoes are suitable for ingestion raw, one must consider their texture, sweetness, and juiciness. Under the same farming conditions, we assessed the differences between 81 cultivars in sixteen parameters. This demonstrated that the most sensitive traits of sweet potato cultivars were their adhesiveness, fructose content, and glucose concentration. Using cluster analysis, six types of sweet potatoes were discovered. To improve the nutritional content of sweet potato tuberous roots when consumed fresh.^8,9

The predominant bioactive components of the various varieties of sweet potatoes are believed to consist of flavonoids and polyphenols. These SPL have shown various noteworthy potential health-promoting qualities, including anti-behavior for hepatotoxicity, cancer, diabetes, inflammation, bacteria, and oxidation, because of the high concentration of these bioactive substances. To confirm the benefits of various SPL for improving health, more clinical trials and human health studies should be carried out. Determining the whole phytochemical profiles of the various varieties of sweet potatoes in relation to their bizoactivity is also essential. SPL has the potential to be a valuable natural food source that the food and pharmaceutical industries can employ to create a sustainable production. Research has been conducted both nationally and worldwide. For example, SPL polyphenol is composed of several constituents. There are now limitations to the ability to separate and purify individual components, and further research is required to identify the differences in activity levels among different components. In general, this study should be seen as an initial step toward the extraction, separation, and biochemical assessment of antioxidant chemicals, which will aid future research on the nutritional value of hog plum pulp. Given the current lack of clarity surrounding the processes behind polyphenol activity, particularly the in vivo mechanism, there is no firm theoretical basis for the use of phenolic activities in SPL. Thus, further investigation into the purification, separation, and structure-activity relationships of SPL polyphenol is needed. ^16,17

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Received on 20.12.2023 Revised on 08.04.2024

Accepted on 13.07.2024 Published on 28.01.2025

Available online from February 27, 2025

Research J. Pharmacy and Technology. 2025;18(2):522-528.

DOI: 10.52711/0974-360X.2025.00078

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Creative Commons License.

Figure 1: Shows the Health Benefits of Sweet Potato 39.

Figure 1: Shows the Health Benefits of Sweet Potato ³⁹.