Honey is a natural product that found the best quality of honey storage time and temperature the physicochemical properties Kelulut, Gelam, Acacia honeys stored at different temperatures ( days and to identify the storage conditions suitable to be applied for each type of honey results of this study showed that the quality of times and temperatures. Hutan honey was condition. Thus, it is recommended that Hutan honey should be stored at room temperature to retain its quality.
Abstract. Organic wastes from Swiettenia marcophylla L, Artocarpus heterophyllus L, Mangifera indica L, and Annona muricata L were prepared by grinding into 0.1875, 0.3750, 0.7500 mm of particle size and delignified by 2% NaOH at 80 o C for 90 minutes. Acid dilution hydrolysis process with H2SO4 1% was performed at 150 o C for 120 minutes in a closed reactor. The effect of particle size and delignification on and reducing sugar concentration were investigated. The result showed (1) leaves that can be used as raw material to produce hydrogen should have 38-49% cellulose and hemicellulose. (2) Reducing sugar concentration increased with particle size reduction and delignification. (3) the best result with the highest reducing sugar concentration was achieved by 0.1875 mm particle size with delignification on Annona muricata L.
Multistage Countercurrent Extraction (MCE) is a new extraction technique used to extract bioactive compounds (anthocyanin, quercetin, antioxidants) from purple roselle calyxes (Hibiscus sabdariffa L.). This study of purple roselle calyxes extract with three-stage MCE was carried out at a comparison of roselle calyxes and distillation water solvent 1:10, extraction temperatures of 50°C, 60°C, 70°C and extraction time of 15, 30, 45 minutes. Purple roselle calyxes using the MCE method contained the highest anthocyanin content of 2815,43 mg/L, quercetin content 59,25 mg/L, and antioxidant capacity 197,6 ppm. The results showed that the content of bioactive compounds increased by increasing the extraction temperature and extraction time. MCE is an efficient technique for extracting bioactive compounds from roselle calyxes. Roselle calyxes that are rich in antioxidants have the potential as a good food colorant andnatural antioxidants.
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