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Pre-harvest factors affecting quality and shelf-life in raspberries and blackberries (Rubus spp. L.)

Ali, Liaqat (2012). Pre-harvest factors affecting quality and shelf-life in raspberries and blackberries (Rubus spp. L.). Diss. (sammanfattning/summary) Alnarp, Sweden : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2012:58
ISBN 978-91-576-7705-1
[Doctoral thesis]

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Abstract

Fruit including berries have been demonstrated to exhibit a broad spectrum of benefits including protection against cardiovascular, neurological, and lung diseases, as well as having antioxidant, antimicrobial, anti-inflammatory, anti- diabetic and anti-aging properties. These protective effects are reported to be due to their high content of bioactive compounds, such as vitamin C, vitamin E, phenolic acids, ellagitannins, flavonoids and carotenoids. This thesis investigated the effect of pre- and postharvest factors on the concentrations of bioactive compounds in raspberries and blackberries. The factors studied included genetic variability, organic and synthetic fertilizers, seasonal variation (harvest-to-harvest and annual variation) in greenhouse, high tunnel and open field production, and post-harvest storage. Concentrations of bioactive compounds (anthocyanins, vitamin C, ellagic acid, carotenoids) in the berries, or in the leaves, were quantitatively analysed by high-performance liquid chromatography, and total phenolics were analysed by a spectrophotometric method. Generative parameters (yield, fruit size) investigated for the cultivar difference and organic nitrogen, responded differently to the nitrogen level within cultivars and varied significantly in primocane raspberries. Taste compounds, such as total acidity and different sugars, varied during the season and with nutrient regimes. Time of harvest also affected the ellagic acid content, which was high in early season, and the vitamin C content, which was high in late season in primocane raspberries. Significant changes were also found between different years. Vitamin C decreased significantly with high synthetic N and with low K application, but the application of high N with high K showed positive influence in the level of nutrients and bioactive compounds in blackberries except for ellagic acid. Increased level of organic fertilization (12-17 g N/plant) in primocane raspberries caused only minor changes in the analysed compounds. The post-harvest performance of raspberries regarding the levels of bioactive compounds was less dynamic than in blackberries. In addition, raspberries harvested in late season showed comparatively less changes in sugar content during storage as compared to early harvest, indicating less enzymatic activity in the late season.

Authors/Creators:Ali, Liaqat
Title:Pre-harvest factors affecting quality and shelf-life in raspberries and blackberries (Rubus spp. L.)
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :24 August 2012
Volume:2012:58
Number of Pages:73
Papers/manuscripts:
NumberReferences
1Ali, L., Svensson, B., Alsanius, B.W. & Olsson, M.E. (2011). Late season harvest and storage of Rubus berries - major antioxidant and sugar levels. Scientia Horticulturae 129(3), 376-381.
2Ali, L., Alsanius, B., Rosberg, A., Svensson, B., Nielsen, T. & Olsson, M. E. (2012). Effects of nutrition strategy on the levels of nutrients and bioactive compounds in blackberries. European Food Research and Technology 234(1), 33-44.
3Ali, L., Svensson, B., Alsanius, B.W. & Olsson, M.E. Influence of time of harvest, annual variation and storage on quality of raspberries cultivated in open field, high tunnel and greenhouse. (Manuscript)
4Ali, L., Svensson, B., Alsanius, B.W. & Olsson, M.E. Quality of primocane raspberries - cultivar and organic nitrogen interactions in late summer and autumn production. (Manuscript)
Place of Publication:Alnarp, Sweden
Publisher:Department of Horticulture, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:Z - SLU - Libray > Odla mera
ISBN for printed version:978-91-576-7705-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
F Plant production > F60 Plant physiology and biochemistry
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Horticulture
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Obsolete subject words > ODONTOLOGY > Physiology
Obsolete subject words > PHARMACY > Pharmaceutical chemistry
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:rubus, raspberries, blackberries, antioxidants, anthocyanins, ascorbic acid, fructose, postharvest technology, seasonal variation, cultivation, storage
Keywords:anthocyanins , antioxidants , cultural regime , flavonoids , fructose , glucose, post-harvest storage , seasonal influence , sucrose, vitamin C
URN:NBN:urn:nbn:se:slu:epsilon-e-609
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-609
ID Code:9029
Department:(LTJ, LTV) > Horticulture (until 121231)
External funders:FORMAS
Deposited By: Mr. Liaqat Ali
Deposited On:07 Sep 2012 11:05
Metadata Last Modified:22 Mar 2015 15:09

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