Effect of initial treatment in the preparation of natural indigo dye from Indigofera tinctoria

Abstract

Protection capacity of mosquito repellent ink from citronella (Cymbopogon nardus L.) and clove leaf oils (Syzygium aromaticum) againts Aedes aegypti AIP Conference Proceedings 1855, 020023 (2017) Abstract. The current tinting industries return to the use of natural dyes because of their characteristics including safe and environmentally friendly. Indonesia can widely promote the potential of natural colours due to the availability of abundant natural dye plants. One of the potential plants that generates blue colour is Indigofera tinctoria. This research was conducted to improve the quality and quantity of natural indigo dye for batik production that supports the environment sustainability. The indigo dark blue paste was produced by initial treatment of soaking in cold water for 48 hours. The 48 hours fermentation anaerobic conditions reached optimum temperature, due to time and pH were also met by nutrients. Aeration was done in ten minutes using an aquarium air pump to increase mixing in water immersion with solution of calcium oxide. Indoxyl in the fermented leaves of Indigofera tinctoria is easily oxidized by air in alkali solution that will form pigment indigo. In that condition, lime (CaO) can be used in the manufacture of indigo paste. In this study, the higher concentrated of blue colour was achieved by lesser amount of lime. The soaking treatment in cold water produced high amount of dyes rather than the initial treatment by both hot water and grounding the indigo leaves. Analysis were done by using UV-Vis Spectrophotometry which showed the value of absorbance. The sample that was soaked in 5 liters of water added by a kilogram of Indigofera tinctoria leaves and 15 grams of lime for 48 hours, obtained the highest absorbance or concentration level. The application of the indigo dyes with or without mordanting agent was also tested for colour fastness.

Green Synthesis of Metallic Nanoparticles Using Some Selected Medicinal Plants from Southern Africa and Their Biological Applications

“…Further characterization revealed that the RhNPs were amorphous [ 29 ]. Apart from RhNPs, other metallic NPs, including zinc oxide and cobalt, have been reportedly synthesized from A. linearis and fully characterized [ 123 ], but nothing is reported regarding their biological applications.…”

“…FTIR analysis of the fabricated AgNPs indicated relevant absorption peaks corresponding to N-H stretching from peptide linkages and C-C stretching vibrations of aromatic amines. The fabricated AgNPs were tested on Indian and Saudi Arabian strains of Anopheles, Aedes, and Culex mosquitoes and reported to be a source of green nanoinsecticides against mosquito vectors [ 123 ]. Also, the bacteria growth inhibition effect of the biogenic A. herba-alba AgNPs was demonstrated against B. subtilis , K. pneumonia , and S. typhi .…”

Kajian Pemanfaatan Limbah Perkebunan Untuk Substitusi Bahan Pewarna Alami Batik

“…Bahan pewarna alami dapat diperoleh dari pengolahan bahanbahan alam di daerah sekitar pengrajin batik, tidak bergantung impor seperti bahan pewarna sintetis. Produk ramah lingkungan sesuai untuk konsumen modern yang lebih memperhatikan kelestarian lingkungan (Purnama et al, 2017), dan sesuai isu green product pasar global (Purwanto, 2018). Zat warna alam bersifat non karsinogenik sehingga nyaman dan aman jika dipakai oleh manusia, efek intensitas warna terhadap kornea mata terasa lebih menyejukkan hingga dapat menyehatkan (Siregar, 2016) (Dewi, 2014).…”

Pengaruh Jenis Mordan dan Proses Mordanting Terhadap Kekuatan dan Efektifitas Warna Pada Pewarnaan Kain Katun Menggunakan Zat Warna Daun Jambu Biji Australia

“…Namun demikian, pasar pewarna alami meningkat dan memiliki hubungan linear dengan orang-orang modern yang lebih memperhatikan kelestarian lingkungan. (Purnama et al 2017) Zat pewarna alam dapat diperoleh dari binatang, mineral-mineral dan tumbuhan baik secara langsung maupun tidak langsung. Zat pewarna alam ini diproleh dengan cara ekstraksi atau perebusan secara tradisional.…”