Sains
Malaysiana 41(4)(2012): 411-418
Kesan Penambahan Kalsium Karbonat dan
Sukrosa ke Atas Ciri Ekstrak Roselle
Menggunakan Kaedah Respon Permukaan
(Effect
of Calcium Carbonate and Sucrose Addition on the Properties of Roselle
Extract
Using Response Surface Methodology)
Wan
Zawiah Wan Abdullah
Jabatan
Agroteknologi, Fakulti Agroteknologi dan Sains Makanan , Universiti
MalaysiaTerengganu
21030
Kuala Terengganu, Terengganu Darul Iman, Malaysia
Md
Zaidi Yahaya
Jabatan
Sains Makanan, Fakulti Agroteknologi dan Sains Makanan, Universiti Malaysia
Terengganu
21030
Kuala Terengganum, Terengganu Darul Iman, Malaysia
Mohamad
Yusof Maskat*
Pusat
Pengajian Kimia dan Teknologi Makanan, Fakulti Sains dan Teknologi,
Universiti
Kebangsaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia
Diserahkan:
3 Jun 2011 / Diterima : 30 September 2011
ABSTRAK
Kajian
ini dijalankan bagi menentukan kesan penambahan kalsium karbonat (CaCO3) dan
sukrosa ke atas ekstrak roselle dengan menggunakan Kaedah Respon Permukaan.
Sebanyak 21 perlakuan digunakan berdasarkan reka bentuk eksperimen Central Composite Rotatable
Design (CCRD). Penentuan nilai pH dan Briks telah dijalankan. Bagi nilai pH,
model yang didapati adalah 4.03+0.39x1-8.20x2-0.05x12-4.16x22-0.02x1x2 dengan nilai x1 adalah kalsium karbonat dan nilai x2 adalah sukrosa. Nilai positif pada kepekatan kalsium menunjukkan penambahan
kalsium meningkatkan nilai pH ekstrak roselle. Model untuk Briks adalah 8.91 +
0.23x1 + 2.20x2. Nilai positif pada kepekatan kalsium dan
sukrosa menunjukkan penambahan kalsium dan sukrosa meningkatkan nilai Briks
ekstrak roselle. Penilaian sensori dengan menggunakan panel terlatih (n=8)
menunjukkan penambahan sukrosa meningkatkan penerimaan keseluruhan terhadap ekstrak
Roselle. Manakala, kesan penambahan kalsium karbonat telah mengurangkan
penerimaan keseluruhan kerana ia merendahkan rasa masam.
Kata
kunci : Kaedah respon permukaan; kalsium karbonat; roselle; sukrosa
ABSTRACT
This
study was conducted to determine the effect of calcium carbonate (CaCO3) and
sucrose addition on roselle extract using Response Surface Methodology. A total
of 21 treatments were used based on a Central Composite Rotatable Design (CCRD).
Determination of pH and Brix were carried out. For pH, the model used was
4.03+0.39x1-8.20x2-0.05x12-4.16x22-0.02x1x2 where x1 is calcium carbonate and x2 is sucrose. The
positive coefficient for calcium carbonate showed addition of calcium increased
pH of the roselle extract. Model for Brix is 8.91 + 0.23x1 + 2.20x2.
The positive coefficient for calcium carbonate and sucrose showed the addition
of calcium carbonate and sucrose increased the degree of Brix of the roselle extract.
Sensory evaluation using trained panelists (n=8) showed addition of sucrose
increased overall acceptance for roselle extract. Addition of calcium carbonate
reduced the overall acceptance due to the lowering of the sour taste.
Keyword: Calcium carbonate;
Response Surface Methodology; roselle; sucrose
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*Pengarang
untuk surat-menyurat; email: maskatmy@yahoo.com
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