Postharvest treatment is one of the important factors that affected the shelf-life of fresh-cut pineapples (Ananas comosus). Pineapples have a short shelf life, that is 2-3 days after harvest without cold storage. Recently, the application of edible coatings is widely used to extend the shelf-life of pineapples. The edible coating can be produced from alginate, starch, chitosan, or aloe vera as the main composition. In this study, it is purposed to prolonged the storability of pineapples using starch-based edible coating combined with chitosan. Starch is obtained from cassava peels because they contain 44-59% of starch. On the other hand, chitosan acts as a stabilizer and antimicrobial agent. Furthermore, glycerol is added as a plasticizer in order to increase the elasticity of the edible film. The edible coating was prepared using various compositions of starch and glycerol (in % w/v), then 1% w/v of chitosan dissolved in ascorbic acid was added to the solution. The fresh-cut pineapples were dip-coated into the mixture. Subsequently, they were stored in the refrigerator at 12°C. Physicochemical properties of cassava peels starch-based edible coating were examined by functional groups analysis, solubility analysis, and pH measurement. The results showed that chitosan-modified edible coating with 5 % w/v of starch-0.6 ml/gr of glycerol can prolong the shelf-life of pineapples to 14 days. It had 58.46% solubility and 18% of increasing pH within 14 days. In addition, this variable obtained the highest score of overall acceptance in organoleptic evaluation, which was 5.47 out of 7.
Nanas (Ananas comosus) adalah salah satu komoditas buah unggulan di Indonesia. Namun, buah nanas termasuk sangat sensitif dan mudah mengalami penurunan kualitas. Salah satu cara untuk mencegah atau memperlambat fenomena tersebut adalah dengan melapisi nanas terolah minimal menggunakan edible coating. Pada penelitian ini, edible coating dibuat dari pati kulit singkong, kitosan, dan gliserol. Kitosan tidak dapat larut dalam air, sehingga harus menggunakan asam asetat dan asam sitrat untuk melarutkannya. Selain sebagai pelarut, asam asetat dan asam sitrat juga berperan sebagai antioksidan. Tujuan dari penelitian ini adalah memperoleh komposisi edible coating terbaik untuk melindungi nanas terolah minimal dari pembusukan. Pembuatan edible coating dilakukan dengan variasikan konsentrasi pati, gliserol, serta jenis asam untuk melarutkan kitosan. Adapun hasil terbaik yang didapatkan pada variabel M yang terdiri dari pati 5% b/v, gliserol 0.6 mL/gr, kitosan 1% b/v dengan pelarut asam sitrat 2% b/v. Browning muncul pada hari ke-14 pada nanas terlapisi edible coating Variabel M yang disimpan pada suhu 12.4oC dengan persen penurunan kadar vitamin C adalah 1.11%. Hasil ini juga sesuai dengan data uji sensori, dimana nanas dengan pelapis Variabel M memperoleh nilai rata-rata kesukaan tertinggi untuk parameter aroma, tekstur, warna, rasa, dan total penerimaan.
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