Moisture sorption isotherms of dried sandfish (Holothuria scabra) for shelf life prediction

Date

2016

Abstract

Dried sandfish (Holothuria scabra) is often poorly dried by artisinal fishers in the Philippine, resulting in downgrading of the product, this study aimed to develop moisture content sorption isotherms (MSI) at 30, 45 and 60 deg C at ten levels of water activity (alpha w) using an isopiestic method based on saturated salt solutions. MSI data was fitted to six mathematical models by non-linear regression analysis. Water vapor transmission rate (WVTR) of low-density polyethelyne (PE) and polypropylene (OPP) film was measured at 30 and 35 deg C. A mass-balance model was used to predict shelf life and moisture content during storage based on MSI and WVTR data. MSI of H.scabra followed a type III curve, which was best fitted to a Peleg model. For a stable product, the recommended range for MC during storage was 0.12- 0.18 g/g dry matter to avoid over-or under-drying, this corresponded to alpha w of 04-0.6. Predicted shelf life for PE and OPP film packs at 30 deg C reached 11 4 and 372 d, respectively; at 35 deg C, predicted shelf life was 83 d and 141 d, respectively.

Book Title

Increasing sea cucumber production and value of dried sea cucumber products: project 3: Enhancing the sea cucumber industry appropriate processing technology

Contributor

Yaptenco, K.F., Pardua, S.N., Duque, J.A.C., Pangan, R.S.

Language

English

En – AGROVOC descriptors

HOLOTHURIA SCABRA; SEA CUCUMBERS; DRIED PRODUCTS; PROCESSED PRODUCTS; MOISTURE CONTENT; KEEPING QUALITY; WATER ACTIVITY; DRYING

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