Development of fishing vessel shipyard in traditional Lampulo, Banda Aceh

The construction of ships at the Lampulo shipyard has not all used the rules according to naval architecture. But there may be ineffectiveness in the use of raw materials such as a lot of wasted wood volume. This research was conducted to know the types of wood and equipment used for traditional shipbuilding and know the process of traditional shipbuilding. This research used a survey method and data was collected by interviewing and observation. This research is located in the Kutaraja Ocean Fishery Port, Banda Aceh conducted from March to April 2021. The results showed that the types of wood commonly used as raw materials for shipbuilding in traditional shipyards were bangkirai wood (Shore Laevifolia Endert), laban wood (Vitex Punesceus Vahl), balau wood (Hopea Calebica Burck), meranti merah wood (Shorea Acuminata Dyer), tembusu wood (Fagraea Fragrans Roxb), bungur wood (Lagerstroemia Speciosa Pers), and merbau wood (Intsia Bijuga). The equipment used still uses non-electronic equipment, only drill work that uses electricity. Meanwhile, the traditional shipbuilding process generally begins with laying the keel and installing the crest. Next, continued by frames installation, hull plank then upper hull main frame. Hereinafter, deck floor installation, hatches manufacture, and superstructure construction. The final stage of shipbuilding process is machining, painting, installing engines, propellers, and steering. Thus it can be said that the construction of a fishing vessel in Lampulo still traditionally a hereditary habits.

Standardized method to extract phenolic compounds from Lagerstroemia speciosa L. (Jarul) for enhanced antioxidant activity

Phenolic compounds contribute to the antioxidant property of plants and the efficient extraction of plant phenolics could enhance its antioxidant potential. Lagerstroemia speciosa (L.) Pers. has been investigated for its pharmacological activities, but comparing its antioxidant activities of phenolics derived from its various parts has a key role in developing natural antioxidants. This study was conducted to standardize the extraction of phenolics from leaves, pods and branches of L. speciosa plant, followed by determination of antioxidant activities of their solvent fractions. Phenolic compounds were extracted from the leaves, pods and branches under different parameters such as temperature, pH, type of solvent and volume of the solvent. The extracted phenolic compounds were subjected to solvent fractions and antioxidant assays were performed. Among the various extraction methods tested, the best method was 50% ethanol +1% HCl, refluxing temperature, 100 ml of solvent and 1 hour extraction time. The best solvent fractions were determined as NaHCO3 + ethyl acetate for pods and ethyl acetate alone for leaves and branches with extracted phenolics content of 150.2 mg/g, 136.2 mg/g and 82.9 mg/g, respectively. The chloroform fraction was best among the fractions with maximum ascorbic acid equivalent (ASE) in all the parts of L. speciosa tested. Ferrous ion chelating capacity indicated that butanol fraction had the highest chelation and the same was recorded in ferric ion chelating assay with an EC50 value of 28.2. Hydroxyl radical scavenging activity of the fractions indicated that NaHCO3 + EtOAc fraction of pods had potential activity. Thus, the phenolic compounds from L. speciosa are excellent sources for future investigation on potent natural antioxidant compounds.