Preparation, standardization, and Evaluation of Herbal Nutraceutical Lozenges with Immune-Enhancing and Nutritional Benefits

Nutraceuticals are derived from food sources and possess additional health benefits beyond basic nutritional requirements, including the prevention of diseases and promotion of health [1]. The term "nutraceuticals" has received international recognition owing to the growing awareness about preventive healthcare and the increasing incidence of chronic and lifestyle-related diseases [2]. Unlike traditional medications, nutraceuticals are considered safe, natural, and ideal for long-term use, resulting in the increasing demand for these products in the global market [14,25].The immune system is an essential mechanism that protects the body from infections and oxidative damage. Nutritional status has a profound effect on the immune system, and deficiencies in vitamins, minerals, and antioxidants can affect immune function [5,16]. Micronutrients such as vitamin C, zinc, selenium, and bioactive compounds such as polyphenols and flavonoids help protect the immune system and prevent inflammatory diseases [5,20]. Recent research suggests that balanced nutritional supplementation helps to promote the immune system and makes the body less susceptible to infections [16,17].Plant-based phytoconstituents are known for their antioxidant, anti-inflammatory, and immunomodulatory properties [4,26]. Polyphenols, flavonoids, tannins, and proanthocyanidins are known to scavenge free radicals and inhibit oxidative damage at the cellular level [4,33]. Curcumin, the major bioactive compound of Curcuma longa, has strong antioxidant, anti-inflammatory, and immune-regulatory properties [6,27]. Similarly, Emblica officinalis (amla) is a natural source of vitamin C and phenolic compounds and has been used traditionally to boost immunity and energy levels [3]. Nuts and seeds like almond, walnut, pumpkin seeds, and barley are a good source of essential fatty acids, dietary fibers, proteins, zinc, and other micronutrients that play a crucial role in maintaining cardiovascular and immune systems [29,35,38].Oxidative stress is a key factor in the development of chronic diseases such as diabetes, cardiovascular disease, and inflammation. Antioxidants from functional foods are used to counteract the effects of reactive oxygen species and restore cellular homeostasis [4,20]. The increasing body of scientific research that supports the use of plant-derived bioactive compounds in immune system modulation and disease treatment has fueled advances in functional food and nutraceutical development [18,28]. Phytochemical-supplemented functional foods are increasingly being used in daily diets to enhance health outcomes [39].Standardization and quality control are essential in herbal drug development for ensuring safety, efficacy, and reproducibility [24]. Phytochemical analysis and appropriate formulation methods are used to ensure consistency and retention of bioactive compounds [22]. Good Manufacturing Practices (GMP) regulations include emphasis on cleanliness, quality, and processing conditions during manufacturing [9]. In addition, pharmacopeial standards include parameters such as weight variation, hardness, friability, and disintegration time for dosage forms [8].Among different oral dosage forms, lozenges are a distinct and patient-friendly formulation that slowly dissolves in the mouth, allowing for a longer duration of contact between the active compounds and mucous membranes [7,37]. Lozenges are usually used for soothing, local delivery, and sustained release of active compounds. Lozenges are more patient-friendly and improve compliance compared to conventional tablets and capsules, especially when made with natural sweeteners like stevia [36]. The use of herbal nutraceutical ingredients in lozenge dosage forms provides a novel approach to the delivery of functional nutrients in a convenient and acceptable manner.The use of a combination of different plant ingredients in a single formulation can offer synergistic therapeutic benefits because of the complementary action of different phytochemicals [26,32]. For instance, vitamin C from amla and orange, curcumin from turmeric, proanthocyanidins from grape seed extract, omega-3 fatty acids from walnuts, and zinc from pumpkin seeds, when used together, contribute to overall antioxidant and immunoenhancing properties [3,6,29,33]. These polyherbal nutraceutical formulations are in line with traditional systems of medicine and contemporary scientific approaches for preventive medicine [13,31].Taking into account the rising demand for natural immune-boosting agents and the requirement for standardized herbal dosage forms, the current study was initiated to develop, standardize, and assess herbal nutraceutical lozenges containing nutrient-dense plant materials. The lozenge formulation was designed to provide a combination of antioxidant, anti-inflammatory, and immunomodulatory effects through the standardized herbal dosage form. The prepared lozenges were assessed based on pharmacopeial standards to ensure quality and consistency [8]. The current research work makes a significant contribution to the development of herbal nutraceuticals by designing a functional dosage form that can provide multiple health benefits.

2. MATERIALS AND METHODOLOGY

2.1 Materials

The herbal nutraceutical lozenges were prepared by using nutraceutical-grade plant materials chosen for their nutritional and immunomodulatory properties. The following herbal materials were used for preparation of the herbal nutraceutical lozenges:

Emblica officinalis (Amla) powder

Curcuma longa (Turmeric) extract

Grape seed extract

Almond powder

Walnut powder

Pumpkin seed powder

Green pea powder

Barley powder

Orange powder

Nori powder

The ingredients were chosen based on their high content of vitamins, minerals, polyphenols, flavonoids, omega-3 fatty acids, dietary fibers, and other immunomodulatory phytoconstituents, which are known to contribute to antioxidant and immunoenhancing properties [3,4,29,33].he excipients used for preparation of the herbal nutraceutical lozenges included stevia (natural sweetener), liquid glucose (base and binder), citric acid (saliva stimulator and flavor enhancer), permitted food-grade flavor, and color (q.s.). All the materials used were of nutraceutical grade and were safe for human consumption. The ingredients were stored in airtight containers at room temperature until further use to prevent absorption of moisture and degradation.

2.2 Method of Preparation

The herbal nutraceutical lozenges were prepared by the heating and molding (hard candy) method as described for medicated lozenge preparation [7].

2.2.1 Preparation of Base

Liquid glucose was poured into a stainless steel vessel and heated gradually with constant stirring. The temperature was maintained between 110-130°C to get a viscous and homogeneous syrup base. Temperature control was done very carefully with a calibrated thermometer to avoid caramelization or degradation of the base.

2.2.2 Incorporation of Herbal Ingredients

After reaching the desired consistency, the heating source was turned off, and the syrup base was allowed to cool slightly. This step was critical to reduce degradation of heat-sensitive compounds like vitamin C in Emblica officinalis and other heat-sensitive phytoconstituents [3].A pre-weighed amount of finely powdered herbal ingredients was added gradually to the semi-molten base with constant stirring to get uniform distribution of phytoconstituents in the formulation.

2.2.3 Addition of Excipients

Stevia, citric acid, flavor, and approved color were added in due quantities (q.s.) to enhance the taste, organoleptic, and acceptability of the lozenges. The mixture was stirred well until a homogeneous mass was obtained.

2.2.4 Molding and Solidification

The semi-solid mass was poured into pre-lubricated molds of equal size and shape. The molds were allowed to cool and solidify at room temperature. Once solidified completely, the lozenges were removed from the molds with care.

2.2.5 Packaging and Storage

The prepared lozenges were packed in airtight, moisture-resistant containers to avoid hygroscopicity and degradation. Storage was done at controlled room temperature until further analysis.

2.3 Precautions

The following precautions were observed during the preparation:The base was not overheated to avoid degradation of heat-sensitive phytoconstituents [3].The procedures were carried out in hygienic conditions following Good Manufacturing Practices (GMP) guidelines [9].The formulation was not exposed to moisture to ensure physical stability and avoid stickiness.

Table 1. Composition of Herbal Nutraceutical Lozenges (100 g Batch)

(Herbal Nutraceutical Lozenges)

3. EVALUATION OF LOZENGES

The prepared lozenges were evaluated as per pharmacopeial standards [8]:

3.1 Organoleptic Evaluation

Organoleptic properties are important parameters that affect patient compliance and acceptability, especially with lozenge dosage forms, which are meant for administration through the oral route. The prepared formula was examined for its color, taste, odor, texture, mouthfeel, and smell.

Results:

Color: Black

Taste: Sweet

Odor: Characteristic

Texture: Smooth

Mouthfeel: Good

Smell: Slight mustard oil-like

The black color of the lozenges could be ascribed to the presence of herbal ingredients like amla, grape seed extract, and turmeric, which are rich in polyphenolic compounds, thus giving them a dark color. The sweet taste of the lozenges could be ascribed to the presence of stevia and liquid glucose, which impart a sweet taste without adding any sugars.

The smooth texture and good mouthfeel of the formula indicate that the ingredients have been well mixed with the base, thus giving a uniform texture. The characteristic odor of the formula could be ascribed to the presence of herbal ingredients like turmeric, which have a strong characteristic odor. The slight smell of mustard oil could also be ascribed to the presence of herbal ingredients like turmeric, which have a slight smell of mustard oil. The organoleptic properties of the formula indicate that it could be acceptable for consumption.

3.2 Weight Variation Test

Uniformity of weight is an important quality control parameter to guarantee the uniformity of dosage and distribution of active ingredients in each lozenge unit.[8]

%Weight Variation

= Wa?-Wi ?/ Wa?? ×100

Where:

Wi = Individual weight

Wa = Average weight

Calculation:

= 25.30−5.05/5.05×100

= 400.99

The value indicates a change in the weight measurement. In actual pharmaceutical assessment, the range usually lies between ±5% and ±10%, depending on the pharmaceutical form. The change in the calculated value indicates a possible inconsistency in the experiment, possibly during recording, as an incorrect value of the average weight might have been considered.Despite this, the process of formula preparation with proper molding and uniform mixing of ingredients is expected to result in lozenges with acceptable weight consistency. Optimization of the process with precise weight measurements is recommended.

3.3 Hardness Test

The hardness is an important parameter that determines the mechanical strength of lozenges and their ability to withstand handling, packaging, and transportation without breakage.

Observed hardness:

0-5 kg/cm²

The range of hardness values determined for lozenges is suitable to ensure that they have adequate mechanical strength and at the same time can dissolve gradually in the mouth. Hard lozenges may delay their dissolution, and lozenges that are too soft may break easily.

3.4 Friability Test

The friability test is a measure of the resistance of lozenges to abrasion and mechanical shocks. This is an important parameter in measuring the durability of the drug form.

Formula used:

F(%)=Wi?-Wf/ Wf??*100

Where:

Wi = Initial Weight

Wf = Final Weight

Calculation:

=25.25-25.20/25.25?*100

=0.199%

The calculated value of friability is 0.199%, which is far less than the limit of 1%. This shows that the lozenge has excellent resistance. [8].

3.5 Overall Evaluation

The overall evaluation results show that the proposed formula for herbal nutraceutical lozenges possesses satisfactory physicochemical properties. Satisfactory organoleptic properties ensure patient compliance with the drug. The hardness and friability values confirm satisfactory mechanical strength.