Malays. Appl. Biol. (2009) 38(1): 49–53
BOUND WATER DETERMINATION OF Katsoubushi (Euthynnus affinis) USING THREE MATHEMATICAL MODELS
RITA HAYATIa, AMINAH ABDULLAHb, MOHD. KHAN AYOBb and SOEWARNO T. SOEKARTOc
aLecturer at University Syiah Kuala, Nanggroe Aceh Darussalam, Banda Aceh, Indonesia
bFood Science Program, School of Chemical Sciences and Food Technology
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia
cFaculty of Science and Food Technology, Institut Pertanian Bogor, Dramaga, Bogor, Indonesia
ABSTRACT
The water sorption regions accounted for three fractions of bound water as analyzed using three different mathematical models. Water isotherm sorption curve of katsoubushiis typical sigmoid, the first water fraction ranged 0 – 5.95%, the second 5.95 – 17.52% and the third fraction ranged 17.52 – 91.12% dry basis (db), which is equivalent to 0 – 5.6%, 5.6 – 14.9% and 14.9 – 47.4% wet basis (wb), respectively. The water sorption regions, which is suitable for storage purposes, controlled the microbial growth, inhibited enzyme activity and fulfilled the packaging requirement.
ABSTRAK
Kawasan isoterma serapan air untuk tiga fraksi telah dianalisis dengan menggunakan tiga model matematik yang berbeza. Lengkuk isoterma serapan air katsoubushiberbentuk tipikal sigmoid, meliputi tiga kawasan serapan air iaitu kawasan fraksi air pertama antara 0 – 5.95%, kedua 5.59 – 17.52% dan ketiga 17.52 – 91.12% berat kering (bk), atau dalam berat basah fraksi air pertama 0 – 5.6%, kedua 5.6 – 14.9% dan ketiga 14.9 – 47.4% berat basah (bb). Kawasan air merupakan tahap yang paling baik untuk tujuan penyimpanan, dan dapat mengawal pertumbuhan mikroorganisma, merencat aktiviti enzim dan memenuhi keperluan pembungkusan.
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