Quality Characteristics of Processed Opuntia ficus-indica Using Selected Drying Techniques

Area of Science:

• Food Science
• Nutritional Science
• Agricultural Science

Background:

• Cactus cladodes (Opuntia ficus-indica L.) are a potential source of valuable nutrients and bioactive compounds.
• Drying methods significantly influence the technological, physical, nutritional, and bioactive properties of plant-based flours.
• Understanding these properties is crucial for optimizing the use of cactus cladode flour in food and pharmaceutical industries.

Purpose of the Study:

• To develop and characterize cactus cladode flour using freeze-drying (OP-FD) and air circulation oven drying (OP-AC).
• To compare the technological, physical, nutritional, and bioactive properties of OP-FD and OP-AC flours.
• To evaluate the potential of cactus cladode flour as a functional ingredient.

Main Methods:

• Cactus cladodes were processed into flour using freeze-drying (OP-FD) and air circulation oven drying (OP-AC).
• Technological properties (water activity, moisture, ash), nutritional composition (protein, lipids, dietary fiber), mineral content, organic acids, and bioactive compounds (phenolics, flavonoids, antioxidant activity) were analyzed.
• Specific analytical techniques included proximate analysis, ICP-OES for minerals, HPLC for organic acids and phenolic compounds, and FRAP assay for antioxidant capacity.

Main Results:

• Both OP-AC and OP-FD flours exhibited low water activity and moisture content, with OP-AC having lower moisture (5.8%) and higher protein (14.17%) and ash (18.18%) content compared to OP-FD.
• Both flours were rich in dietary fiber (approx. 41.5 g/100g) and essential minerals like potassium, chlorine, and calcium.
• OP-AC showed significantly higher total phenolic compounds (799.83 mg GAE/100g), total flavonoids (189.16 mg EC/100g), and antioxidant activity (FRAP: 7.04 µmol TE/g) compared to OP-FD, with quercetin and procyanidin B2 being key compounds in OP-AC.

Conclusions:

• Air circulation oven drying (OP-AC) is superior to freeze-drying (OP-FD) for preserving nutrients and enhancing antioxidant properties in cactus cladode flour.
• Cactus cladode flour, particularly when processed via oven drying, is a promising functional ingredient rich in fiber, minerals, and bioactive compounds.
• The findings support the utilization of cactus cladode flour in the development of innovative food products and pharmaceutical formulations.