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Kota surabaya,
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INDONESIA
Matematika dan Sains
Published by Universitas Negeri Surabaya
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Core Subject : Education,
Mathematics
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Articles 14 Documents
 1   2 
Search results for , issue " Vol 17, No 2 (2010)" : 14 Documents clear
PEMANFAATAN BENTONIT TERPILAR SEBAGAI KATALIS REAKSI ESTERIFIKASI LANGSUNG SENYAWA TABIR SURYA OKTIL p-METOKSISINAMAT Subekti Wibowo, ; Maria Monica Sianita, ; Titik Taufikurahmah,
Matematika dan Sains Vol 17, No 2 (2010)
Publisher : Matematika dan Sains

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Abstract

The goal of research were to find percent yield of octyl p-metoxycinnamat (OPMS) obtained from direct esterification between p-metoxycinamic acid and n-octanol using the Zinc pillaring bentonite as catalyst. Zinc pillaring bentonite was made by mixing the bentonite and pillaring agent at 80 oC for 50 menutes. OPMS was prepared by heating p-metoxycinamic acid and n-octanol using zinc pillaring bentonite for 4 hours at 60-70 oC. Structure of OPMS was identified by spectroscopic methods including UV-Vis and IR spectrophotometer, while percent yield was determined using densitometry method. Based on this research, percent yield of OPMS was 42,4196 %.oC for 50 menutes. OPMS was prepared by heating p-metoxycinamic acid and n-octanol using zinc pillaring bentonite for 4 hours at 60-70 oC. Structure of OPMS was identified by spectroscopic methods including UV-Vis and IR spectrophotometer, while percent yield was determined using densitometry method. Based on this research, percent yield of OPMS was 42,4196 %.
UJI KESTABILAN SENYAWA TABIR SURYA Riza Ummul Khusniah, ; Nurul Hidajati,
Matematika dan Sains Vol 17, No 2 (2010)
Publisher : Matematika dan Sains

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Abstract

The aim of research was to test the stability of the sunscreen 2-ethyl hexyl p-methoxycinnamate (EHPMS) in bentonite pillared Ti4+. The stability was determined by comparing with the sunscreen 2-ethyl hexyl p-methoxycinnamate without bentonite terpilar Ti4+ using TLC and IR spectrophotometer. The results of stability test showed that the EHPMS more stable in bentonite pillared Ti4+ matrix.4+. The stability was determined by comparing with the sunscreen 2-ethyl hexyl p-methoxycinnamate without bentonite terpilar Ti4+ using TLC and IR spectrophotometer. The results of stability test showed that the EHPMS more stable in bentonite pillared Ti4+ matrix.
SENYAWA SCOPOLETIN DARI EKSTRAK KLOROFORM Restu Putri, ; Tukiran,
Matematika dan Sains Vol 17, No 2 (2010)
Publisher : Matematika dan Sains

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Abstract

A phenolic compound from the stem bark of Sandoricum koetjape Merr.(local name: kecapi) had been isolated for the first time. The compound isolated was gained from chloroform extract after doing a series of fractionation using various chromatographied method, including vacuum liquid chromatography (VLC), flash chromatography (FC), and preparative-thin layer chromatography (P-TLC), usually monitored by TLC. Based on spectroscopic data i.e. IR, UV-Vis, and GC-MS, it was established that the isolate was scopoletin
SENYAWA FLAVANON DARI TUMBUHAN Suyatno, ; Nurul Hidajati, ; Mahanani Tri Asri, ; Rizka Ayu Hamida,
Matematika dan Sains Vol 17, No 2 (2010)
Publisher : Matematika dan Sains

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Abstract

A flavanone namely 5-hydroxy-7-methoxy flavanone (pinostrobin) had been isolated from dichloromethane extract of the leaves of the Pteriss vittata. It was gained as a pale yellow needles, m.p. 96-97 oC. The molecular structure of isolate was identified by spectroscopic methods, including UV, IR, and EIMS.A flavanone namely 5-hydroxy-7-methoxy flavanone (pinostrobin) had been isolated from dichloromethane extract of the leaves of the Pteriss vittata. It was gained as a pale yellow needles, m.p. 96-97 oC. The molecular structure of isolate was identified by spectroscopic methods, including UV, IR, and EIMS.

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