Judul: Literature Review on Anthocyanin Extraction from Butterfly Pea Flower (Clitoria ternatea) as An Antioxidan and Their Potential Applications for Food Products
Abstrak: Bunga telang (Clitoria ternatea) merupakan tumbuhan yang banyak berkembang di daerah tropis dan sering dimanfaatkan untuk berbagai keperluan. Bunga telang mengandung antosianin yang memiliki potensi sebagai antioksidan dengan cara menghambat radikal bebas. Kajian literatur bertujuan menganalisis metode ekstraksi antosianin dari bunga telang dan potensinya apabila diaplikasikan sebagai antioksidan pada produk pangan. Metode kajian meliputi penjabaran topik, pencarian literatur, evaluasi dan seleksi literatur, serta interpretasi dan analisis literatur. Hasil kajian menunjukkan antosianin bunga telang memiliki fungsi antioksidan dilihat dari kemampuannya dalam mencegah berbagai penyakit karena kerusakan oksidatif melalui pengujian in vitro maupun in vivo. Delfinidin dan beberapa turunannya seperti ternatin merupakan jenis antosianin yang teridentifikasi pada bunga telang melalui berbagai metode analisis. Maserasi dan ultrasound assisted extraction banyak diterapkan untuk proses ekstraksi antosianin. Nilai TAC (Total Anthocyanin Content) yang dihasilkan dari kedua metode tersebut berkisar antara 1,28 sampai 3,95 mg/g DW, diikuti dengan nilai aktivitas antioksidan yang berkisar antara 57,59 sampai 68,48% inhibisi. Faktor - faktor yang mempengaruhi hasil ekstraksi antosianin adalah suhu, pelarut, rasio antara pelarut dan sampel, serta waktu ekstraksi. Beberapa penelitian telah mengaplikasikan ekstrak antosianin sebagai antioksidan pada beberapa makanan maupun minuman. Namun, sifat antioksidannya dinilai masih lemah karena kondisinya yang masih mudah berubah selama pengolahan produk., Butterfly pea flower (Clitoria ternatea) is a plant that grows in the tropics and is often used for various purposes. Butterfly pea flower contains anthocyanin which has potential as an antioxidant by inhibiting free radicals. The literature review aims to analyze the anthocyanin extraction method from the flower and its potential when applied as an antioxidant in food products. The methods include topic description, literature search, literature evaluation and selection, and followed by literature interpretation and analysis. The results of this study indicate that the anthocyanins of butterfly pea flower have antioxidant functions seen from its ability to prevent various diseases caused by oxidative damage through in vitro and in vivo tests. Delfinidine and some of its derivatives, such as ternatin, are anthocyanin species identified in butterfly pea flower through various analytical methods. Maceration and ultrasound assisted extraction are widely applied for the extraction of anthocyanins. The value of TAC (Total Anthocyanin Content) resulting from the two methods ranged from 1.28 to 3.95 mg/g DW, followed by the value of antioxidant activity which ranged from 57.59 to 68.48% inhibition. The factors that influence the anthocyanin extraction result are temperature, solvent, ratio between solvent and sample, and extraction time. Several studies have applied anthocyanin extract as an antioxidant in several foods and beverages. However, its antioxidant properties are still considered weak due to its volatile condition during product processing.
Keyword: antioxidant, antioxidant activity, anthocyanin, butterfly pea flower, extraction

Judul: Optimasi Proses Ekstraksi Antosianin Bunga Teleng (Clitoria ternatea L.) dengan Metode Permukaan Tanggap
Abstrak: The Box-Behnken experimental design with Response Surface Methodology has been used in optimation of extraction process of anthocyanin from butterfly pea (Clitoria ternatea L.) petal. The extraction process was conducted with no light by using water. The ratio of fresh petal to water-HCl (pH 4.5) was 1:4 (w/v). The optimum process was defined as a set of extraction factors by using highest extract volume, anthocyanin and total phenol content as the selected parameters. The three factors were blanching time (0 to 12 minutes), extraction temperature (30 to 60oC) and extraction time (30 to 120 minutes). The research showed that all factors had significant effect to volume by following reduced 2-factor interaction model, while anthocyanin content and total phenol content was effected by following reduced quadratic model. Based on the models, the most efficient extraction process was 6 minutes for blanching time followed by 30 minutes of extraction time at 60oC. The antioxidant activity and stability during storage of the extract was also studied. The research showed that highest antioxidant activity of butterfly pea flower extract was reached at pH 1 (flavylium cation) followed by pH 4.5 (hemiketal form) and pH 7 (quinonoidal base). The study of stability showed that butterfly pea extract was very unstable at pH 12 to 14, both in room temperature and 4oC storage. The extracts with pH 1 to 11 at 4oC were much more stable compare to the room temperature. At room temperature, the highest stability showed by pH 1 and followed by pH 2. At 4oC the extracts with pH 1 to 2 and 7 to 11 were stable during 28 days storage.
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Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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