Roselle flower contains various active compounds including organic acid, hydroxycitric acid, hibiscus acid, anthocyanin, flavonoids and polysaccharides The anthocyanin compounds in rosella flowers are the most important pigment of vascular plants, harmless and that make it interesting is a soluble pigment in water media Anthocyanin extract is one of the most successful natural sensitizers for solar cells, because this organic dye produces a high yield of photons to current conversion and is easy to obtain and cheap. Anthocyanins can be potential as sensitizers, because they range in the light spectrum from red to blue. The purpose of this study was to obtain anthocyanin pigments at the optimum extraction conditions from roselle flowers. The optimization of the method was carried out by analyzing the effect of ultrasonic wave frequency, process temperature, extraction time, and mass ratio of roselle flowers to the volume of distilled water on the anthocyanin concentration. The qualitative and quantitative compositions of the anthocyanin extract of rosella flowers were analyzed by UV-Vis spectrophotometer. The results showed that the optimal operating conditions for the extraction process were known at a temperature of 40 °C, a frequency of 24 kHz, a time of 5 minutes, and a ratio of 1: 25.

The pigment in mulberry (Morus alba L.), anthocyanin, is a kind of natural pigment for food processing and has functional potential and commercial values. Some investigators have developed a method to obtain high extraction yields in a short time. High yields with Ultrasonic Assisted Extraction method using ultrasonic waves that affect the cell wall and causes the destruction of a thin layer and helps in releasing phenolic compounds that trapped in the cell wall. Microwave Assisted Extraction method uses the energy of microwave radiation to heat the solvent quickly and efficiently. This study concludes and gives an overview advantages of both methods were compared with conventional methods.

The development of heterogeneous catalysts for biodiesel production became a hot topic among scientists because of its many advantages including easy separation and catalyst reusability. In this study, multi-walled carbon nanotubes supported zinc oxide (MWCNTsZ) as a solid acid catalyst had been successfully prepared via the stober-like process. There are several % loading of ZnO variations ranging from 10 – 35 % of catalyst weight. These catalysts were characterized by x-ray diffraction (XRD), BET surface area analysis, and scanning electron microscope with energy-dispersive x-ray spectroscopy (SEM-EDX) analysis. Transesterification of kesambi (Schleichera oleosa) oil also had been done to test the activity of the solid catalyst. The potential of this catalyst is shown from its large surface area with the maximum surface area until 409 m2/gram. However, the quantity of dispersed zinc oxide (ZnO) on multi-walled carbon nanotubes (MWCNTs) via that modified Stober preparation is quite small lower than 5% weight. This phenomenon is resulting in a low yield of biodiesel after 3 h of transesterification reaction. The highest yield of biodiesel is obtained with 20% weight of loading ZnO variable producing 13.82% yield of methyl ester.

Abstract-The human perception on food is closely associated with its color. Since the standard manufacturing procedure often causes partial even total degradation of natural pigments, resulting in color fading, the addition of colorants becomes necessary. Natural colorant, produced from plants or animals, has health promoting effects, better safety, and need not any specific toxicity evaluation. However, the extraction method will be crucial in determining the properties of this biocolorant. In the present study, red biocolorant was prepared from selected local plants i.e., red spinach, red cabbage, beetroot, and dragon fruit, through physical extraction in order to avoid the using of organic solvents. Then, we applied the encapsulation technique and evaluated its coloring and antioxidant properties, as well as its stability against thermal treatment. The results showed that the encapsulated biocolorant of red spinach and beetroot exhibited red hue at pH range 2-11, whereas those of red cabbage and dragon fruit indicated color alteration at different pH. The prominent red hue intensity was found at pH 4 for encapsulated beetroot extract, which endured up to 10 days at aqueous buffered solution when stored in the dark at 20 0 C. In addition, it underwent merely low degradation (∼30%) during incubation at 60 0 C for 30 minutes. The antioxidant activity of encapsulated biocolorant of beetroot was comparable to that of red cabbage, being higher than the others.

Desa Tegalweru yang terletak di Kecamatan Dau, Kabupaten Malang dikenal dengan hasil panennya yaitu cabai, jeruk, pisang, dan tomat. Program pengabdian kepada masyarakat yang dilakukan pada tahun 2018 adalah membantu permasalah mitra dalam mengelola potensi lokal yang ada di Desa Tegalweru untuk meningkatkan nilai jual produk di desa tersebut. Upaya yang telah dilakukan adalah memberikan penyuluhan kepada masyarakat mengenai keamanan pangan, bagaimana pengolahan pangan yang sehat dan pemanfaatan bahan tambahan pangan yang aman bagi kesehatan. Berdasarkan hasil survei terhadap penduduk setempat, kemudian dilakukan analisis menggunaan wilcoxon test, dihasilkan p-value = 1. Berdasarkan hasil tersebut didapati bahwa terjadi peningkatan kesadaran masyarakat mengenai teknik pengolahan pangan yang sehat dan penggunaan BTP yang aman bagi tubuh atau kesehatan.