Formulation and Evaluation of Dark Chocolate-Based Healthy Bar Using Amla Powder

Abstract

Dark chocolate, made from Theobroma cacao and containing 70-85% cocoa solids, is celebrated for its high content of flavanols (such as catechins and procyanidins), which provide strong antioxidant, heart-protective, and anti-inflammatory effects by neutralizing free radicals, enhancing endothelial function, and regulating lipid levels. Nevertheless, the loss of nutrients during processing warrants the addition of natural superfoods like amla powder (Emblica officinalis Gaertn.), an Ayurvedic ingredient packed with 193-720 mg of vitamin C per 100 g, along with gallic acid, ellagitannins (emblicanins A/B), quercetin, and tannins, which together improve oxidative stability and boost nutritional value. This research details the formulation of a high-protein, antioxidant-rich health bar. The process involved blending 5–15% fine-milled amla powder into dark chocolate, using jaggery to balance flavor and cocoa butter to ensure textural quality. Quality control testing yielded consistent results in weight variation ($<2\%$) and pH levels, while proximate and phytochemical analyses confirmed elevated fiber, protein (10–12 g/serving), and potent antioxidant activity via DPPH assays. Optimized formulations (F2 and F3) showed a glossy brown appearance, smooth texture, and high scores on the 9-point hedonic scale. They remained stable for 15 days at 2–8°C. The amla–cocoa combination enhanced antioxidant activity, showing better DPPH scavenging than plain chocolate, while improving RBC glutathione levels and reducing lipid peroxidation, with effects comparable to 150–200 μg/mL extracts. This clean-label functional chocolate bar meets the demand for plant-based snacks supporting metabolic health and shows potential for large-scale production, though further clinical studies are needed.

Keywords: Dark Chocolate, Amla Powder, Heart Disease, Protein Bar