Aging indicators for stored carioca beans

Area of Science:

• Agricultural Science
• Food Science
• Plant Physiology

Background:

• Tropical conditions accelerate post-harvest bean disorders, affecting color and hardness.
• Understanding bean darkening and hardening mechanisms is crucial for maintaining quality.

Purpose of the Study:

• To investigate the mechanisms of darkening and hardening in carioca beans during storage.
• To evaluate the relationship between bean aging indicators and culinary quality.

Main Methods:

• Comparative analysis of bean genotypes with contrasting darkening and hardening characteristics.
• Assessment of physicochemical, biochemical, and morphological attributes after harvest and six months of storage.
• Measurement of superoxide dismutase (SOD) activity, lipid peroxidation (LP), bivalent ions, and membrane damage.

Main Results:

• All bean samples hardened over time, but darkening velocity did not consistently correlate with hardening.
• Increased SOD activity and LP were observed, particularly in the integument of rapid-darkening genotypes.
• Bivalent ion concentration and membrane damage were positively associated with bean darkening.

Conclusions:

• Bean aging is a complex process influenced by genotype and post-harvest duration.
• Color is not a reliable predictor of carioca bean culinary quality.
• Cooking time, hardness, and color can differentiate between rapid and slow-darkening beans.