review · Sustainability
African leafy vegetables provide essential nutrients and health-promoting bioactive compounds, making them valuable resources for resource-limited communities. Preservation techniques such as sun drying, solar drying, blanching, and freezing are commonly employed to extend shelf life and ensure year-round supply. However, the outcomes of these methods vary significantly in terms of nutrient retention, phytochemical stability, sensory quality, and microbial safety. Broader commercialisation and utilisation remain hindered by persistent value-chain challenges. These include deficient processing and storage infrastructure, insufficient value addition, weak integration into markets, and limited consumer awareness. Unlocking the potential of these crops to strengthen food security requires standardising preservation approaches, investing in processing infrastructure, reinforcing value chains, and establishing supportive policy frameworks.
African leafy vegetables offer an accessible route to strengthening food security and improving nutrition in resource-constrained areas. Improving preservation techniques and processing infrastructure helps prevent spoilage, ensures reliable year-round access to vital nutrients, and creates opportunities to transition traditional crops into sustainable, revenue-generating food products for local communities.
The work identifies potential commercial opportunities for agribusinesses and food processors in creating preserved, value-added vegetable products. However, commercial uptake is currently hindered by infrastructure deficits, unstandardised preservation methods, and weak market integration. As a review identifying existing systemic challenges rather than testing a specific device, the pathway to scaled commercialisation appears to be at an early stage, dependent on standardisation and capital investment in processing facilities.
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African leafy vegetables (ALVs) are increasingly recognised for their nutritional, phytochemical, and socioeconomic importance, particularly in resource-limited communities. This narrative review synthesises current evidence on the effects of preservation methods on nutritional composition, phytochemical stability, microbial quality, sensory attributes, consumer acceptability, and their contribution to sustainable food systems in South Africa, supported by evidence from across Africa and the broader scientific literature. Evidence indicates that ALVs are rich sources of essential nutrients and bioactive compounds with important health-promoting properties. Preservation methods such as sun drying, blanching, freezing and solar drying are widely used to extend shelf life and improve year-round availability. However, their effects on nutrient retention, phytochemical stability, microbial safety, and sensory quality vary considerably. The review further highlights persistent challenges within ALV value chains, including inadequate processing and storage infrastructure, limited value addition, weak market integration, and low consumer awareness. Collectively, these constraints restrict the wider utilisation and commercialisation of ALVs despite their potential to strengthen food security and improve dietary quality. Standardised preservation approaches, investment in appropriate processing infrastructure, stronger value chains, improved consumer awareness, and supportive institutional and policy frameworks are required to enhance the adoption and sustainable utilisation of ALVs.
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DOI: 10.3390/su18178984
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