PENGARUH KOMPOSISI DAN SUHU TERHADAP KUAT TARIK LEATHER KANGKUNG DAN OPTIMASINYA (Influence Of Composition And Temperature Against The Strong Pull Of Leather Ipomoea Reptans Poir And Optimization)

Abstract

ABSTRAK
Fruit leather merupakan makanan ringan yang berbentuk lembaran tipis
mempunyai tekstur sedikit liat dan mudah digulung. Penelitian ini bertujuan untuk
mengkaji pengaruh komposisi dan suhu terhadap kuat tarik leather kangkung.
Penelitian ini menggunakan Response Surface Methodology (RSM) dengan 3 faktor
yaitu kadar pektin, asam sitrat dan suhu dan 5 level masing-masing faktor, yaitu
dengan kadar pektin 4, 6, 8, 10, 12%, asam sitrat 0,1, 0,2, 0,3, 0,4, 0,5% dan suhu 50,
55, 60, 65, 70oC. Hasil penelitian menunjukkan bahwa semakin tinggi nilai kadar pektin
maka akan tinggi nilai kuat tarik, penambahan asam sitrat juga menambah kuat tarik.
Semakin tinggi suhu maka akan mempengaruhi tekstur kekerasan. Optimum kuat tarik
leather kangkung adalah 0,7170 kg.force dengan kadar pektin sebanyak 7,3986%,
asam sitrat 0,2896% dan suhu 50,0oC dengan nilai composite desirability d = 0,05515.
Kata Kunci : Kangkung, Leather, Pektin, Asam Sitrat, Suhu, (RSM).

ABSTRACT
Fruit leather is snacks in the shape of a thin sheet, e.astic texture and easily
rolled. This research assessed the influence of composition and temperature on the
tensile strength of water spinach (Ipomoea reptans Poir) leather. This research
employed the Response Surface methodology (RSM) with the three factors, namely
the level of pectin, citric acid and temperature at 5 levels of each factor, with pectin
levels of 4, 6, 8, 10, 12%, citric acid 0.1, 0.2, 0.3, 0.4, 0.5% and temperature of 50, 55,
60, 65, 70oC. The results showed that the higher levels of pectin the higher tensile
strength. Similarly, pectin concentration also showed positive correlation on tensile
strength of the leather. Temperature significantly and positively affected tensile
strength. Optimum tensile strength of leather was 0.7170 kg.force with 7.3986% pectin,
0.2896% citric acid and 50oC, with the value of the desirability of composite d =
0.05515.
Key words : Ipomoea reptan poir, leather, pectin, citric acid, tempetature (RSM).