Malaysian Journal of
Analytical Sciences Vol 20 No 4 (2016): 812 - 819
DOI:
http://dx.doi.org/10.17576/mjas-2016-2004-14
SENSORY CHARACTERISTICS OF MUD CLAM (Polymesoda erosa) HYDROLYSATE
(Ciri–ciri Deria Hidrolisat Lokan (Polymesoda
erosa))
Normah Ismail*
and Noorasma Mustakim
Department
of Food Technology,
Faculty
of Applied Sciences,
Universiti
Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
*Corresponding author: norismel@salam.uitm.edu.my
Received: 24
February 2015; Accepted: 27 October 2015
Abstract
Mud clam (Polymesoda erosa) was hydrolysed using two different
microbial enzymes; alcalase and flavourzyme. The volatile compounds, amino
acids and molecular weight associated with umami and bitter taste in mud clam
hydrolysate were determined by head space solid phase micro-extraction gas
chromatography (HS-SPME-GCMS), High performance liquid chromatography (HPLC)
and sodium dodecyl sulphate polyacrylamide gel electrophoresis (
Keywords: mud clam hydrolysate, volatile compounds,
amino acids, molecular weight, sensory
Abstrak
Lokan (Polymesoda erosa) telah dihidrolisiskan menggunakan dua
microbial enzim yang berbeza; alcalase dan flavourzyme. Sebatian meruap, asid
amino dan berat molekul yang dikaitkan dengan umami dan rasa pahit di dalam
hidrolisat lokan ditentukan oleh ruang kepala pepejal mikro fasa kromatografi
gas (HS-SPME-GCMS), cecair kromatografi berprestasi tinggi (HPLC) dan
elektroforesis gel sodium dodekil sulfat poliakrimida (SDS-PAGE). Ciri – ciri
hidrolisat dihasilkan menggunakan alcalase dan flavourzyme dibandingkan. Secara
keseluruhan, lapan belas, tujuh dan enam sebatian meruap telah dikenal pasti
dalam masing – masing pada isi lokan, hidrolisat alcalase dan hidrolisat
flavourzyme. Kandungan sebatian meruap; 2-piperidinone yang dikaitkan dengan
kepahitan adalah 6.79 % pada hidrolisat alcalase dan 3.78 % pada hidrolisat
flavourzyme. Keputusan SDS-PAGE menunjukkan hidrolisat alcalase mengandungi
peptida yang lebih kecil (<52 kDa) berbanding hidrolisat flavourzyme
(<126 kDa). Di samping itu, analisis deria menggunakan kuantitatif deskriptif
analisis (QDA) menunjukkan bahawa hidrolisat flavourzyme adalah yang paling
kurang pahit dan memberi rasa umami yang lebih berbanding hidrolisat alcalase.
Penambahbaikan lanjut masih diperlukan untuk meningkatkan rasa umami dan untuk
menghilangkan rasa pahit dalam hidrolisat lokan.
Kata kunci: hidrolisat lokan, sebatian meruap, asid amino,
berat molekul, deria
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