ArticlePDF Available

Abstract

In order to reduce the loss of quality of freshly harvested strawberries during storage, the effects of different packaging materials were examined with regard to storage time and temperature regime (20 degrees C with relative humidity 75%, 4 degrees C with relative humidity 88%). Strawberry containers ( 500 g) were used differing in form, alignment and number of ventilation openings, top and material. It was found that a drop in temperature to 4 degrees C preserved the quality of strawberries longer in all packaging variants. Nevertheless, the used packaging material had different effects on the quality parameters. The packaging material made of polypropylene, which was closed with a lid and was equipped only with little ventilation openings, yielded the best results, e. g. the transpiration losses were strongly reduced, thus favouring the preservation of pulp consistency and colour stability of the fruits. On the other hand, the fresh mass during storage was reduced by the materials polyethylenterephthalat, polyactid and groundwood. The quality loss was less dependent on the material, but more dependent on the number of ventilation openings. The results showed that with increasing numbers of ventilation openings the transpiration losses increased and the consistency and colour stability of the fruits decreased. In this context, a strong reduction of pathogenic infestation in relation to the ventilation openings could not be observed. As such, the loss of freshness was lowest with the packaging material of polypropylene, followed by the polyethylenterephthalat, polyactid and groundwood. Moreover, it was found that the kind of packaging material and the ventilation openings had an effect on the amount of pressure marks and the discharge of cell sap of the strawberries. The uneven ground surface of the materials made of polyethylenterephthalat and polyactid increased the punctual pressure on the strawberry fruits, which led to pressure marks and injuries of the fruit surface. Sharp-edged ventilation openings close to the ground surface of these variants favoured injuries and cell sap discharges of the packaging.
Anyone will be able to connect to a view-only version of my article for free.
http://rdcu.be/ohZH
ResearchGate has not been able to resolve any citations for this publication.
Conference Paper
The objective of the present study was to determine the effects of different kinds of transport packaging on changes in postharvest quality of tomatoes. The experiments comprised 4 different types of packaging units characterised by air permeabilities (openings in the bottom and in the side walls) between 3 and 25%. The climatic conditions (air temperature, air humidity, flow conditions) on the way from the producer to the consumer were simulated in 5 phases under labora-tory conditions. The evaluation of the results was carried out considering transpiration and respiration behaviour of the fruits. The flow conditions close to the produce sur-faces, which strongly affect the transpiration behaviour, were determined using a new at ATB developed method. The respiration intensity as a measure for changes in internal compounds was recorded by means of infrared gas sensors. The higher air permeability of the plastic containers had a positive effect on the shelf life of the tomatoes. Initially higher water loss was compensated during the postharvest period by somewhat higher transpiration resistances subsequently. The higher resistances (transpiration and respiration) influenced changes in quality de-termining substances and microbial activity in a positive manner, so that the limits of marketability were reached later and keeping quality increased.
Polyolefins like polyethylene (PE), polypropylene (PP) and their copolymers inclusive elastomers (EPM, EPDM) are materials with wide ranges of properties and excellent environmental compatibility. Therefore use and production of these products increase steadily. By the development of new catalysts and advanced technologies tailor-made products with new combinations of properties are available which open superior applications. To these products belong materials with Schúlz,Flory- or bimodal molecular mass distributions, new types of linear low density products with homogeneous comonomer distribution, multiphase polypropylene blends and long glass fibre reinforced polypropylene materials. With metallocenes new types of polyolefins can be synthesized like syndiotactic polypropylene and other polyolefins.
Article
Perforated polypropylene packages were used to study the effects of perforation on gas concentration and strawberry quality. Strawberry packages with perforations, and treated by simulating transport and shelf-life conditions, developed an internal atmosphere with composition close to that recommended for this fruit. This controlled decay and reduced deterioration, thus extending strawberry postharvest life. Moreover, fruit ripeness degree and nutritional value were better preserved, although this modified atmosphere packaging seemed to reduce fruit color and lead to off-flavor development.
Article
Fresh strawberries (Fragaria x ananassa Duch.), raspberries (Rubus idaeus Michx.), highbush blueberries (Vaccinium corymbosum L.), and lowbush blueberries (Vaccinium angustifolium Aiton) were stored at 0, 10, 20, and 30 degrees C for up to 8 days to determine the effects of storage temperature on whole fruit antioxidant capacity (as measured by the oxygen radical absorbing capacity assay, Cao et al., Clin. Chem. 1995, 41, 1738-1744) and total phenolic, anthocyanin, and ascorbate content. The four fruit varied markedly in their total antioxidant capacity, and antioxidant capacity was strongly correlated with the content of total phenolics (0.83) and anthocyanins (0.90). The antioxidant capacity of the two blueberry species was about 3-fold higher than either strawberries or raspberries. However, there was an increase in the antioxidant capacity of strawberries and raspberries during storage at temperatures >0 degrees C, which was accompanied by increases in anthocyanins in strawberries and increases in anthocyanins and total phenolics in raspberries. Ascorbate content differed more than 5-fold among the four fruit species; on average, strawberries and raspberries had almost 4-times more ascorbate than highbush and lowbush blueberries. There were no ascorbate losses in strawberries or highbush blueberries during 8 days of storage at the various temperatures, but there were losses in the other two fruit species. Ascorbate made only a small contribution (0.4-9.4%) to the total antioxidant capacity of the fruit. The increase observed in antioxidant capacity through postharvest phenolic synthesis and metabolism suggested that commercially feasible technologies may be developed to enhance the health functionality of small fruit crops.
Produktoptimales Handling von ökologisch erzeugten Tomaten
  • Paris Èclairage
  • E Daßler
  • G Heitmann
  • K Hamburg Dumdei
  • M Linke
  • K Ilte
CIE (1976) L*a*b*-Farbraum. Commission internationale l' èclairage, Paris Daßler E, Heitmann G (1991) Obst und Gemüse – Eine Warenkunde, 4. Aufl. Paul Parrey Verlag, Berlin Hamburg Dumdei K, Linke M, Ilte K (2003) Produktoptimales Handling von ökologisch erzeugten Tomaten, Möhren und Erdbeeren – Ein Leitfaden zur Qualitätserhaltung im Einzelhandel und bei der Direktvermarktung. Institut für Agrartechnik Bornim e. V., Potsdam Eyerer P, Elsner P, Hirth T (2004) Kunststoffe und ihre Eigenschaften, 6. Aufl. Springer-Verlag, Berlin Heidelberg New York Hamm U (2002) Wie geht es weiter mit Öko? DLG-Mitteilung 4:76–79
Kein schlechtes Jahr für den Gemüsebau
  • A Kasbohm
Kasbohm A (2002) Kein schlechtes Jahr für den Gemüsebau. ZMP Marktkommentar. Ökomarkt Forum 51/52:6-9
Luca's Anleitung zum Obstbau. Ernte, Lagerung und Aufbereitung, 31. Aufl
  • F Winter
  • H Janssen
  • W Kennel
  • H Link
  • F Scherr
  • R Silbereisen
  • J Streif
Winter F, Janssen H, Kennel W, Link H, Scherr F, Silbereisen R, Streif J (1992) Luca's Anleitung zum Obstbau. Ernte, Lagerung und Aufbereitung, 31. Aufl. Ulmer Verlag, Stuttgart Würtenberger AL, Mitcham EJ (2003) Die kleine Marktstudie: Erdbeeren. Gemüse 10:48-50
Aktuelle Trends bei Verkaufsverpackungen für Gemüse -die Qualität der Produkte erhalten
  • S Huyskens-Keil
Huyskens-Keil S (1999) Aktuelle Trends bei Verkaufsverpackungen für Gemüse -die Qualität der Produkte erhalten. Gemüse 10:364-366
Obst und Gemüse – Eine Warenkunde, 4. Aufl Produktoptimales Handling von ökologisch erzeugten Tomaten
  • Paris Daßler
  • E Heitmann
  • G Dumdei
  • K Linke
  • M Ilte
CIE (1976) L*a*b*-Farbraum. Commission internationale l' èclairage, Paris Daßler E, Heitmann G (1991) Obst und Gemüse – Eine Warenkunde, 4. Aufl. Paul Parrey Verlag, Berlin Hamburg Dumdei K, Linke M, Ilte K (2003) Produktoptimales Handling von ökologisch erzeugten Tomaten, Möhren und Erdbeeren – Ein Leitfaden zur Qualitätserhaltung im Einzelhandel und bei der Direktvermarktung. Institut für Agrartechnik Bornim e. V., Potsdam Eyerer P, Elsner P, Hirth T (2004) Kunststoffe und ihre Eigenschaften, 6. Aufl. Springer-Verlag, Berlin Heidelberg New York Hamm U (2002) Wie geht es weiter mit Öko? DLG-Mitteilung 4:76–79