Judul: Sidik Jari Kromatografi Lapis Tipis dari Daun Tiga Jenis Jambu Biji
Abstrak: Guava leaf contains chemical compounds having antioxidant activity. Quality control methods are needed to maintain the quality of raw materials. The objective of this research is to find the chromatographic fingerprints from guava leaves by using the profile of thin layer chromatography (TLC) which is developed into densitogram. Fingerprint patterns were developed in the form of TLC and densitogram generated by using the software Image J. Fingerprints were generated through optimization of mobile phase composition with the simplex centroid design (SCD). The leaves of three guava types were extracted using two- solvent composition of 96% and 70% methanol. The extracts contained flavonoids and tannins which were detected qualitatively. SCD evaluation shown that the best fingerprints based on its resolution spots from extract methanol 70% were white guava (JBP) and red guava (JBM) with 5 spots and 6 spots, respectively, while extract metanol 96% for guava 7 (JB7) resulted 5 spots. All fingerprints were obtained from chloroform:ethyl acetate as mobile phase with ratio for JBP, JBM, and JB7 were (0.6:0.4), (0.7:0.3), and (0.8:0.2), respectively. Antioxidant activities represented by IC50 value for JBP, JBM, and JB7 were 10.73, 9.45 and 2.63ppm respectively.
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Judul: Analisis Sidik Jari Kromatografi Lapis Tipis Kulit Buah Manggis (Garcinia mangostana L.)
Abstrak: Analisis sidik jari kromatografi lapis tipis (KLT) dapat digunakan untuk mengevaliasi mutu dan keaslian secara multikomponen dari bahan baku ataupun produk tanaman obat. Metode ini dapat mendeteksi pola pemisahan multikomponen yang khas bagi setiap tumbuhan. Penelitian ini bertujuan mengoptimalkan metode analisis sidik jari kromatografi lapis tipis dengan pemilihan fase gerak terbaik pada fase diam silika gel dan tervalidasi sebagai kendali mutu pencegahan pemalsuan bahan baku obat herbal kulit buah manggis (Garcinia mangostana L.). Fase gerak terpilih yang dapat memisahkan 11 pita senyawa dengan keterpisahan yang baik adalah kloroform:etil asetat (85:15). Standar α-mangostin digunakan sebagai senyawa penciri dan dideteksi sebagai pita berwarna hijau kebiruan (Rf = 0,53) di bawah sinar UV 366 nm setelah derivatisasi dengan larutan asam sulfat 10% (v/v). Secara umum, hasil validasi metode sidik jari KLT kulit buah manggis dapat diterima, kecuali untuk parameter ketegaran terhadap jenis bejana. Oleh sebab itu, metode ini dapat digunakan untuk kendali mutu kulit buah manggis., Thin layer chromatographic fingerprint analysis can be used to evaluate the quality and authenticity of multicomponents present in medicinal plant raw materials or products. This method can detect multi-component profiles that are specific to every plant. This study aimed to optimize and validate a method by TLC fingerprint analysis on mangosteen pericarp (Garcinia mangostana L.) as validated quality control for preventing counterfeiting of herbal medicine raw materials by selecting the best mobile phase on silica gel as stationary phase. The best mobile phase in separating 11 bands of mangosteen pericarp was choloform:ethyl acetate (85:15). α-mangostin standard was used as a marker compound and detected as a bluish-green band (Rf = 0,53) under 366 nm ultraviolet light after derivatization with sulfuric acid reagent 10% (v/v). In general, the results of validation revealed that the method is accepted, except for the robustness of different chamber types. Therefore, this method could be used for quality control of mangosteen pericarp.
Keyword: analisis sidik jari, KLT, kulit manggis, fingerprint analysis, Garcinia mangostana, α-mangosteen

Judul: Integration of Islamic Stock Markets of OIC Countries Before and During the Russia-Ukraine War Crisis
Abstrak: Pasar saham yang terintegrasi memberikan dampak negatif seperti percepatan co-movement (pergerakan bersama) yang rentan terhadap guncangan ekonomi, maupun krisis pasar global ke pasar domestik. Salah satu krisis yang terjadi pada tahun 2022 adalah perang Rusia-Ukraina yang berdampak pada pasar saham, termasuk pada saham syariah yang dipercaya lebih tahan terhadap guncangan krisis global. Penelitian ini bertujuan untuk meneliti perkembangan, integrasi dan respon lima pasar saham syariah negara OKI pada perang Rusia-Ukraina. Metode yang digunakan adalah VAR/VECM pada indeks DJIMMT25, SPSADS, SPSUAEDS, JII, DJIMT, SPBMIR, dan SPBMIU. Hasil penelitian menunjukkan pergerakan yang sama pada pasar saham UAE dan Arab Saudi, sedangkan Turki mengalami tren positif selama perang. Pasar saham syariah negara OKI selama periode perang Rusia-Ukraina terkointegrasi, sementara pasar saham Malaysia memengaruhi pasar saham syariah empat negara OKI lainnya. Hasil IRF menunjukkan terdapat efek permanen pada volatilitas pasar saham syariah negara OKI akibat guncangan yang diberikan. Namun, respon volatilitas relatif kecil karena kontribusi guncangan lebih didominasi oleh pasar saham itu sendiri, An integrated stock market has negative impacts, such as accelerating co-movement, which is vulnerable to economic shocks and global market crises on the domestic market. One of the crises in 2022 was the Russia-Ukraine war which impacted the stock market, including Sharia stocks which were believed to be more resistant to the shocks of the global crisis. This study examines the development, integration, and response of OIC countries five Islamic stock markets in the Russia-Ukraine war. The method used is VAR/VECM on the DJIMMT25, SPSADS, SPSUUAEDS, JII, DJIMT, SPBMIR, and SPBMIU indices. The results show the same movement in the UAE and Saudi Arabia stock markets, while Turkey experienced a positive trend during the war. The Islamic stock market of the OIC countries during the Russia-Ukraine war was cointegrated. In contrast, the Malaysian stock market influenced the Islamic stock markets of the other four OIC countries. The IRF results show a permanent effect on the volatility of the Islamic stock market in OKI countries due to the shocks given. However, the volatility response is relatively small because the stock market itself dominates the contribution of shocks.
Keyword: co-movement, OIC, Rusia-Ukraine war, sharia stock market integration