Relation of water loss to compressive and tensile texture parameters of three chilli cultivars.

R Janasithorn, AR East, EW Hewett, Andrew Mawson, JA Heyes

Research output: Book chapter/Published conference paperConference paperpeer-review

Abstract

Postharvest quality loss in stored chilli is often detectable as a change in texture, particularly when there is significant water loss. Three chilli cultivars (?Paprika? (Capsicum annuum), ?Jalapeno? (C. annuum) and ?Habanero? (C. chinense)) were stored in polyethylene (PE) bags at 4, 8, and 20°C. Weight loss of up to 40% was recorded for ?Paprika? stored at 20°C for 14 days, and this was accompanied by significant shrivel. Maximum weight loss of ?Jalapeno? and ?Habanero? was 25-30% after 14 days at 20°C with some symptoms of shrivel. The maximum force (firmness) during compression of a pericarp piece to 50% strain in ?Paprika? and ?Jalapeno? stored at 4°C for 14 days was higher than for chillies stored at 20°C for the same period. For ?Jalapeno? in particular, loss of firmness was proportional to water loss. In a tensile ring test, ?Paprika? and ?Habanero? showed a significant reduction in break strength (maximum force) as storage time increased with the maximum reduction for ?Paprika? occurring at 4°C. These reductions in ring test break strength were unrelated to water loss and were most severe at low temperature, suggesting it may be a physiological response to chilling. Tensile test rings of ?Jalapeno? did not show a large reduction in break strength, and instead showed an increase in maximum stress with storage time, possibly as a result of tissue shrinkage without loss of strength of load-bearing cell walls. For tensile tests of ?Jalapeno?, the slope at 50% of the breakage strain on a stress-strain plot was negatively correlated with water loss suggesting there was a significant impact of turgor change on fruit texture in this thicker-walled cultivar.
Original languageEnglish
Title of host publicationInternational Symposium 2009
EditorsE.W. Hewett
Place of PublicationBelgium
PublisherActa Horticulturae
Pages503-509
Number of pages7
Volume880
Publication statusPublished - 2010
EventInternational Symposium Postharvest Pacifica 2009-Pathways to Quality: V International Symposium on Managing Quality in Chains & Australasian Postharvest Horticultural Conference - Napier, New Zealand, New Zealand
Duration: 15 Nov 200919 Nov 2009

Conference

ConferenceInternational Symposium Postharvest Pacifica 2009-Pathways to Quality: V International Symposium on Managing Quality in Chains & Australasian Postharvest Horticultural Conference
Country/TerritoryNew Zealand
Period15/11/0919/11/09

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