Judul: Aktivitas Hemaglutinin Olahan Koro Pedang (Canavalia ensiformis L.)
Abstrak: Nowadays, the most utilization of legumes as food product and the research activity of the health effect are still focused on soybean. Invention of soybean substitute alternative is needed to decrease soybean import and jack bean could be soybean substitute alternative. One of the inhibitor in food developing for legumes, is the antinutritional content. Jack bean (Canavalia ensiformis L.) contains haemagglutinin such as Concanavalin A lectin which can give haemagglutination effect and reduce protein digestibility. The haemagglutinin activity could be reduced during jack bean processing. The objectives of this research were to analyze and determine jack bean product which has the least haemaglutinin activity. Raw jack beans were processed by: i) soaking and drying, ii) soaking and boiling for 20 minutes, iii) soaking and baking at 150 oC for 30 minutes, and iv) making tempeh. The highest protein content in jack bean extracts was in raw jack bean (40.39 mg/g sample db), meanwhile the lowest protein content was in tempeh (0.84 mg/g sample db). The boiled jack bean had the lowest haemagglutinin activity (8.99 HU/mg extracted protein db).
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Judul: Aktivitas Inhibisi Enzim Pengubah Angiotensin pada Hidrolisat Tempe Koro Pedang (Canavalia ensiformis L.) secara In Vitro
Abstrak: Tempe is one of the processed food that has ACE (Angiotensin Converting Enzyme) inhibitory activity. This study aims to measure the activity of ACE inhibition in jack bean in vitro. Proximate analysis used AOAC method (2005) and hydrolyzed by gastrointestinal simulation (GIS) digestions, and then tested the degree of hydrolysis by Benjakul & Morrissesey modification method. Measurement of ACE inhibitors, based on the rate of formation of hippuric acid from substrate hippuryl-L-histidyl-L-leusine (HHL). Proximate analysis showed fat value of jack bean is lower than soybean and carbohydrate value is higher than soybean. Degree of hydrolysis (DH) of tempe from jack bean showed good results which amounted to 10.62% for crude tempe and 16.24% for steamed tempe. Of the IC 50 values obtained, crude tempe 50% more effective at inhibiting the activity of ACE by 0.26 mg/g sample. However, for the steamed tempeh also obtain poor results, because of the results obtained IC50 1:11 mg/g sample.
Keyword: tempe, in vitro, inhibition, jack bean, HHL, ACE

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology