Pengaruh Penambahan Natrium Metabisulfit dan Suhu Pemasakan dengan Menggunakan Teknologi Vakum terhadap Kualitas Gula Merah Tebu

https://doi.org/10.22146/agritech.9430

Dewi Maya Maharani(1*), Rini Yulianingsih(2), Shinta Rosalia Dewi(3), Yusron Sugiarto(4), Dina Wahyu Indriani(5)

(1) Jurusan Keteknikan Pertanian, Fakultas Teknologi Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145
(2) Jurusan Keteknikan Pertanian, Fakultas Teknologi Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145
(3) Jurusan Keteknikan Pertanian, Fakultas Teknologi Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145
(4) Jurusan Keteknikan Pertanian, Fakultas Teknologi Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145
(5) Jurusan Keteknikan Pertanian, Fakultas Teknologi Pertanian, Universitas Brawijaya, Jl. Veteran, Malang 65145
(*) Corresponding Author

Abstract


Brown sugar as sucrose is derived from evaporated sugar cane molasses. Evaporation is the foodstuffs’ process which is commonly used during the manufacture of sugar cane. This process evaporates the sugar cane molasses to produce concentrate. This research was aimed to assess the influence of sodium metabisulphite against physical and chemical properties of sugar cane using vacuum evaporator. In other hand, this reserach examined the influence of temperature on vacuum evaporator for chemical and physical properties of sugar cane. Sugar cooking was done at -700 mmHg below atmospheric pressure, with variations in heating temperature of 60, 70 and 80 C, and with the addition of sodium metabisulphite 0.1; 0.3 and 0.5 g/l sugar cane molasses. The larger addition of sodium metabisulphite in the processing of sugar cane, the higher ash content generated while the green and blue colors of red sugar cane were getting smaller. The higher cooking temperature, the lower the moisture content, ash content, color intensity of red, green and blue of sugar cane. The higher the cooking temperature, the higher the degree of hardness or texture, color preference level, the taste and texture of sugar cane. Based on statistical analysis, cooking temperature affects the moisture content, ash, and the reduction sugar of cane brown sugar. While the addition of sodium metabisulfite gives effects on ash, reduction sugar and the total dissoluble solids of sugar cane. Based on the parameters of chemical properties, physical, organoleptic tests and SNI requirements of sugar cane, the addition of sodium metabisulphite variation of 0.3 g/l and a heating temperature of 80o C in processing sugar cane into brown sugar have shown the most excellent quality. The value of each parameter based on the best treatments as follows: chemical and physical parameters with 8.97 % of water content, 8.29% of reduction sugar, 0.96 % of ash content, 0.50% of total dissoluble solid, 15.68 kg/cm2 of hardness value, while for organoleptic parameters for color 5.50, flavor 5.04 and texture 5.36.

ABSTRAK

Gula merah sebagai sukrosa diperoleh dari nira tebu yang diuapkan. Penguapan merupakan proses pengolahan bahan pangan yang umumnya digunakan pada pembuatan gula merah tebu, dimana proses ini menguapkan sebagian besar nira untuk menghasilkan produk yang kental (konsentrat). Penelitian ini bertujuan untuk mengkaji pengaruh penambahan natrium metabisulfit terhadap sifat fisik dan kimia gula merah tebu yang dihasilkan dari penggunaan vacuum evaporator, dan mengkaji pengaruh suhu pemasakan pada vacuum evaporator terhadap sifat fisik dan kimia gula merah tebu. Pemasakan gula dilakukan pada tekanan -700 mmHg di bawah tekanan atmosfir, dengan variasi suhu pemasakan 60, 70 dan 80o C dan dengan penambahan natrium metabisulfit 0,1; 0,3 dan 0,5 g/l nira. Semakin besar penambahan natrium metabisulfit dalam pengolahan gula merah tebu, semakin tinggi kadar abu yang dihasilkan sedangkan intensitas warna hijau dan biru gula merah tebu semakin kecil. Semakin tinggi suhu pemasakan, semakin rendah kadar air, kadar abu, intensitas warna hijau dan biru gula merah tebu. Semakin tinggi suhu pemasakan, semakin tinggi tingkat kekerasan atau tekstur, tingkat kesukaan warna, rasa dan tekstur gula merah tebu. Berdasarkan analisis statistik, perlakuan suhu pemasakan berpengaruh terhadap kadar air, kadar abu dan gula reduksi gula merah tebu. Sedangkan perlakuan penambahan natrium metabisulfit berpengaruh terhadap kadar abu, gula reduksi dan total padatan tak terlarut pada gula merah tebu. Berdasarkan parameter sifat kimia, fisik, uji organoleptik dan persyaratan SNI gula merah tebu, penambahan natrium metabisulfit 0,3 g/l dan suhu pemasakan 80o C dalam pengolahan nira tebu menjadi gula merah menunjukkan kualitas yang paling baik. Nilai masing-masing parameternya dari perlakuan terbaik sebagai berikut: parameter kimia dan fisik dengankadar air 8,97%, gula reduksi 7,96 %, kadar abu 2,65%, total padatan tak larut 0,60 %, nilai kekerasan 15,68 kg/cm2, parameter organoleptik denganwarna 5,50, rasa 5,04 dan tekstur 5,36.


Keywords


Sugar cane molasses; sodium metabisulphite; temperature; vacuum evaporator; brown sugar

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DOI: https://doi.org/10.22146/agritech.9430

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Agritech (print ISSN 0216-0455; online ISSN 2527-3825) is published by Faculty of Agricultural Technology, Universitas Gadjah Mada in colaboration with Indonesian Association of Food Technologies.


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