IR Spectrum of Poncirin, Contoh sebuah spektrum inframerah dari sebuah komponen organik

IR spectrum of Poncirin Gambar di atas, sebuah spektrum inframerah (IR) dari sebuah organic compound, poncirin, yang umunya dapat dijumpai pada genus Ponciri, kerabat dekat dengan keluarga jeruk. Oleh sebab itu komponen ini diberi nama Poncirin. Seperti halnya cinnamaldehide dan cinnamic acid yang merupakan senyawa utama dari tanaman cinnamon (kayu manis), beberapa species dari genus Cinnamomun. Di bawah ini struktur kimia dari poncirin. Chemical...

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Analysis of Quinic Acid Derivatives on Seven Cultivars of the Lettuce (Lactuca sativa L.) and Peroxynitrite Scavenging Effect

Abstract The compositional analysis and the peroxynitrite (ONOO-) scavenging assay were undertaken to demonstrate beneficial dietary effect of lettuce (Lactuca sativa L., Compositae). Quinic acid derivatives of the seven cultivars were qualitatively and quantitatively analyzed by HPLC to lead to the finding of 3,4-di-O-caffeoyquinic acid and 3-O-p-coumaroylquinic acid and their contents ranged over 2.72-4.47 mg/g and 8.97-23.26 mg/g, respectively. A cultivar Hacheong had the highest quantity of quinic acid derivatives. The peroxynitrite scavenging...

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Quantitative Analsysis of Flavanone Glycosides and Peroxynitrite Scavenging Effect of the Five Oriental Medicinal Drugs (Aurantii nobilis Pericarpium, Citrii unshiu Pericarpium, Citrii unshiu Semen, Aurantii Fructus, Poncirii Fructus)

Abstract Overproduction of peroxynitrite (ONOO-) causes a variety of disease such as atherosclerosis, hypercholesterolemia, diabetes mellitus or obesity. Peroxynitrite scavenging activities and HPLC analysis on the five Oriental medicinal drugs belonging to the genus Citrus, Aurantium or Poncirus (Rutaceae family) and HPLC analysis were taken to evaluate flavanone glycosides with peroxynitrite scavenging activity. The IC50s of the five crude drugs were shown as follows: Aurantii nobilis Pericarpium (Jinpi, 18.3 μg/ml), Citrii unshiu Pericarpium...

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HPLC Analysis of Caffeoylquinic Acids in the Extract of Cacalia firma and Peroxynitrite Scavenging Effect

Abstract Six caffeoylquinic acids of Cacalia firma (Komarov) Nakai (Compositae) leaves were identified using standard compounds by HPLC. Each content of those compounds in dried weight was determined as follows: 3,4-di-O-caffeoylquinic acid (1.44±0.04 mg/g of dried weight), 3,5-di-O-caffeoyl-muce-quinic acid (2.47±0.12 mg/g), 3,5-di-O-caffeoylquinic acid (3.74±0.24 mg/g), 5-caffeoylquinic acid (chlorogenic acid, 5.20±0.09 mg/g), 3-caffeoylquinic acid (1.35±0.01 mg/g) and 3-Op-coumaroylquinic acid (3.84±0.25 mg/g). The total content of six caffeoylquinic...

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Qualitative and Quantitative Determination of the Caffeoylquinic Acids on the Korean Mountainous Vegetables Used for Chwinamul and Their Peroxynitrite-Scavenging Effect

Abstract  Mountainous vegetables called chwinamul are used in Korea to promote health. Chwinamul was obtained from several plants belonging to the Compositae - e.g., Kalimeris yomena, Aster scaber, Solidago virga var. gigantea, Solidago viragaurea var. asiatica, Saussurea grandifolia, Ainsliaea acerifolia - were used for our experiments. Analytical methods for simultaneous determination of the caffeoylquinic acids (3,4-di-O-caffeoylquinic acid, 3,5-di-O-dicaffeoyl-epi-quinic acid, 3,5-di-O-caffeoylquinic acid, 4,5-di-O-caffeoylquinic acid,...

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Two New Flavonol Glycosides from Lamium amplexicaule L. and Their in vitro Free Radical Scavenging and Tyrosinase Inhibitory Activities

Abstract Two new flavonol glycosides, kaempferol 3-O-[β-D-glucopyranosyl-(1→4)][α-L-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside and quercetin 3-O-[β-D-glucopyranosyl-(1→4)][α-L-rhamnopyranosyl-( 1→6)]-β-D-glucopyranoside, together with three known flavonoids were isolated using column chromatography from the aerial parts of Lamium amplexicaule (Labiatae). In addition, the five isolates were evaluated for their in vitro free radical scavenging (EC50 values, 14.1–63.9 μg/mL) and tyrosinase inhibitory activities (IC50 values, 110.4–193.5 μg/mL). keywords: Lamium...

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Memahami UV spektrofotometri

Sebagai asisten profesor di lab, setiap semester saya ditugasi untuk menghandel mata kuliah praktikum, yaitu Natural Product Analysis dan juga Instrumental Analysis. Di sini saya ingin mendokumentasikan beberapa praktikum yang saya anggap dapat memberi tambahan informasi untuk pembaca sekalian. Selain itu setiaap saat saya juga dapat mereview kembali dengan membuka blog ini. Baik, untuk kali ini akan dibahas mengenai UV spektrofotometri. Ultraviolet...

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