Department of Food 
Science & Human Nutrition

Postharvest handling of fruit and vegetables

Content

Vegetables 1. The principles of post-harvest technology as it relates to horticultural crops. The causes of losses and the magnitude of losses. A brief review of the history of post-harvest technology and the importance of post-harvest handling. 2. The diversity of vegetables and post-harvest changes in metabolism, chemical composition and morphological characteristics of the products. Respiration, water loss, effect of the atmosphere in storage, the role of ethylene. 3. Quality of vegetables. EU legislation. Quality assessment. The quality criteria of the main products. Packaging, sorting, standardization. The operation of packaging plants. 4. Storage of leafy vegetables, immature flower heads, sprouts and salads. 5. Storage of vegetable fruits. 6. (i) Storage of underground organs (roots, tubers, bulbs, corms). Curing of bulbs and tubers. Physiological and morphological changes during storage. (ii) Cryoinjury and chilling injury. Symptoms, causes, effects on quality and storage. Fruit 7. Changes during fruit ripening i. Introduction – Purpose and effectiveness of postharvest treatments ii. Maturity and ripening of fruit iii. Climacteric and non-climacteric fruit iv. Growth regulators in relation to ripening 8. Changes during fruit ripening and ways of controlling ripening . Ethylene biosynthesis i. Action of ethylene at the beginning of ripening ii. Action of ethylene as a hormone iii. Compounds with hormonal action used in practice to regulate fruit ripening or quality, and harvest iv. Changes in proteins 9. Changes during fruit ripening and ways of controlling ripening . Changes in fat components i. Aroma development ii. Colour development iii. Flavour development iv. Consistency changes 10. Harvest – ‘Packing line’ – Degreening . Maturity stage criteria i. Harvest methods (Cutting and collecting fruits of various types) ii. Initial quality of harvested product and main objectives of ‘packing line’ of whole fruits iii. Classic and modern ways of achieving objectives in ‘packing line’ of whole fruits iv. Degreening v. Innovative technologies for determining maturity stage and quality assessment in the field and on the packing line 11. Fruit structure and ‘communication’ of fruit and its environment, Whole and minimally processed fruit, Fruit preservation and Principles 12. Fruit preservation . Classical ways of achieving the preservation of fresh or dried fruit. i. Effectiveness of the methods and technology used for the preservation of fresh fruit. ii. Controlled and modified atmospheres. iii. Handling with innovative compounds (pre- and post-harvest) in combination with classical and innovative preservation methods LABORATORY 1. Identification of the main fruit tree species cultivated in the country 2. Specific Germination and fruiting characteristics of these species

Learning results

The course learning outcomes, specific knowledge, skills and competences of an appropriate (certain)

level, which students will acquire upon successful completion of the course, are described in detail. It is necessary to consult:

APPENDIX A

  • Description of the level of learning outcomes for each level of study, in accordance with the European Higher Education Qualifications’ Framework.
  • Descriptive indicators for Levels 6, 7 & 8 of the European Qualifications Framework for Lifelong Learning and

APPENDIX BGuidelines for writing Learning Outcomes

The objective of the course ‘Postharvest handling of fruit and vegetables’ is to familiarize students, both theoretically and practically, with changes that occur in fresh vegetables and fruit from harvest to consumption, as well as the techniques that are applied during the storage, transportation and marketing of fresh products with the aim of maintaining quality until consumption.

The following topics are covered in detail:

  1. the principles of post-harvest technology, the causes of post-harvest losses and the importance of the problem in food security
  2. changes during fruit ripening related to quality (consumer perception & nutritional value)
  3. climacteric and non-climacteric fruit
  4. post-harvest changes in leafy and root vegetables that affect their storage duration and quality
  5. the effects of growth regulators pre- and post-harvest on fruits and vegetables
  6. ethylene and biostimulants in fruit
  7. the structure of fresh fruits and vegetables in relation to their communication with the environment
  8. methods of preservation of fresh fruit and vegetables
  9. post-ripening of bulbs and tubers
  10. methods of ripening and de-greening of fruit
  11. post-harvest handling of fresh fruit and vegetables (cleaning, packaging, cooling, film coating, controlled and modified atmospheres, etc.)
  12. physiological disorders during the preservation of fruits and vegetables and the ripening or de-greening of fruits
  13. the application of EU quality criteria for fresh fruit and vegetables
  14. innovative packaging materials and innovative technologies for the creation of controlled and modified atmospheres to prevent ripening and preserve fruits and vegetables
  15. Emphasis is placed on the criteria for selecting the appropriate harvest time, as well as on the methods of harvesting, handling and packaging of the products to maintain their quality.
  16. Finally, critical points are highlighted for maintaining quality and avoiding quality 'disorders' (such as injury from low temperature, high concentration of CO2, ethylene, etc.)
  17. The Laboratory Exercises are directly linked to the theory and aim to:
  18. Informing students about the modern ways and means available for post-harvest handling
  19. Assessment of maturity stage
  20. Quality in relation to the changes associated with the ripening and post-harvest life of fresh fruit and vegetables.

Bibliography

1. Μετασυλλεκτική Μεταχείριση Καρπών και Λαχανικών, 2016. Πάσσαμ Χ.Κ., Τσαντίλη Ε., Χριστόπουλος Μ., Καυκαλέτου Μ., Αλεξόπουλος Α., Καραπάνος Ι. Ε-ΒΟΟΚ, ISBN: 978-960-603-261-5, ID: 320234. ΚΑΛΛΙΠΟΣ. (in Greek) 2. Μετασυλλεκτική Μεταχείριση Καρπών και Λαχανικών, 2013. Χ. Πάσσαμ και Ε. Τσαντίλη (Θεωρία και Εργαστήριο). Πανεπιστημιακές Σημειώσεις Γ.Π.Α. (in Greek) 3. Μετασυλλεκτική Φυσιολογία και Τεχνολογία Νωπών Οπωροκηπευτικών Προιόντων, 1995. Ε. Σφακιωτάκης. (in Greek) Related Scientific Journals: 1. Postharvest Biology and Technology, https://www.sciencedirect.com/journal/postharvest-biology-and-technology 2. International Journal of Postharvest Technology and Innovation, https://www.inderscience.com/jhome.php?jcode=ijpti

NEWSLETTER

The Department of Food Science and Human Nutrition (renamed Department of Food Science and Technology, Decree 80/27/5/13, Government Gazette A119 28/5/13) offers its students the scientific background for a rational approach to scientific and technological issues related to the food sector.
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