**Background:** The food industry has traditionally used synthetic additives (e.g., BHA, BHT, sulfites, nitrates, synthetic colorants, and flavorings) to extend shelf life, prevent oxidation, and inhibit microbial growth. However, these additives have been linked to various health problems, including allergic reactions, asthma, hyperactivity, and cancer. Consumer demand for natural, clean-label products has driven interest in plant-derived bioactive compounds as safer alternatives. This narrative review explores the technological properties (antioxidant, antimicrobial, emulsifier, flavoring, and colorant) of plant extracts and their mechanisms of action, focusing on Mediterranean plants such as olive, rosemary, oregano, garlic, pomegranate, grape seed, citrus, and green leafy vegetables. It also discusses their incorporation into active packaging systems to extend product shelf life while reducing synthetic additive use.
**Methods:** This is a narrative review that synthesizes existing literature on plant bioactive compounds as replacers of synthetic additives. The authors describe the chemical composition, mechanisms of action, and applications of various plant extracts, including essential oils (EOs), polyphenols, proteins, polysaccharides, phospholipids, and saponins. They review studies on antimicrobial activity (e.g., EOs disrupting bacterial cell walls), antioxidant mechanisms (e.g., hydrogen atom transfer and electron transfer), emulsifying properties (e.g., plant proteins and polysaccharides stabilizing emulsions), flavoring compounds (e.g., phenolic acids, flavonoids, saponins, alkaloids), and natural colorants (e.g., chlorophyll, betalains, carotenoids, anthocyanins, curcumin). The review also covers active packaging systems, particularly those using encapsulated EOs in cyclodextrins, and case studies on incorporating plant extracts into animal-origin food products (e.g., meat products with olive leaf extract, grape seed oil, or pomegranate powder).
**Key Results:** The review reports that plant extracts exhibit potent antioxidant activity; for example, hydroxytyrosol (HXT) from olive oil has antioxidant capacity ten times greater than green tea and twice that of coenzyme Q10. HXT concentrations in olive varieties range from 0.02 to 600 mg kg⁻¹. Nuts contain γ-tocopherol at 450 mg kg⁻¹ and α-tocopherol at 20 mg kg⁻¹, reducing lipid peroxidation. Essential oils from herbs and spices (e.g., carvacrol, thymol, eugenol) show antimicrobial activity, with Gram-positive bacteria more susceptible than Gram-negative. Encapsulation of EOs in cyclodextrins enables controlled release; for instance, carvacrol release rates increase with temperature and relative humidity. Active packaging with nanoencapsulated citrus EO reduced strawberry decay by 25–30% due to Botrytis cinerea. Plant proteins (e.g., lentil, pea, faba bean, soy) and polysaccharides (e.g., gum arabic, pectin) serve as effective emulsifiers. Natural colorants like anthocyanins (e.g., cyanidin, delphinidin) and carotenoids (e.g., β-carotene, lycopene) provide stable colors. In meat products, incorporation of 750 ppm HXT from olive leaves in chicken nuggets reduced microbial growth and enhanced oxidative stability for 12 months at −18°C. Polyphenols from grape extract inhibited lipid oxidation in chicken meat, and tomato peel increased redness and hardness in beef hamburgers.
**Clinical Implications:** The substitution of synthetic additives with plant bioactive compounds may reduce the risk of adverse health effects associated with synthetic additives, such as allergic reactions, carcinogenicity, and neurological dysfunction. For example, replacing sulfites and nitrates with natural antioxidants from green leafy vegetables or HXT could lower the formation of carcinogenic N-nitrosamines. The use of natural emulsifiers (e.g., plant proteins, saponins) may avoid gastrointestinal and metabolic issues linked to synthetic emulsifiers. Natural colorants like anthocyanins and carotenoids provide safer alternatives to azo-dyes, which have been associated with hyperactivity in children. The review emphasizes that plant extracts are generally recognized as safe (GRAS) and align with the clean-label movement, potentially improving public health by reducing exposure to harmful synthetic chemicals. However, challenges remain, including the higher cost of natural extracts and the need for optimized extraction and encapsulation processes to ensure efficacy and sensory acceptability.