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Katalog Online Perpustakaan Universitas Ma Chung Villa Puncak Tidar N-01 Malang - Jawa Timur.

DDC v.22

Klasifikasi & Katalogisasi DDC versi 22 Indonesia ICT Award 2009

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Title Pengaruh Asam Kuat dan Asam Lemah terhadap Agregasi dan Feofitinisasi Klorofil a dan b
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Author(s) Leenawaty Limantara, Ph.D
Lia Kusmita
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Language Indonesia
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Collation Koleksi elektronik
Abstract/Notes "Chlorophyll is green pigment that can be found in plant chloroplast. Higher plants usually have two kinds of
chlorophylls, chlorophyll a and b. These green pigments are easily degraded by temperature, light intensity, oxygen,
acid, and water. Water causes aggregation of chlorophyll, while acid causes pheophytinization of chlorophyll.
Aggregation and pheophytinization process of chlorophyll are influenced by solvents. This study was conducted to
observe the spectral difference of aggregated chlorophyll in acetone and methanol upon pheophytinization by strong
(HCl) and weak acid (CH3COOH), in comparison to the non-aggregated chlorophyll. Observation of spectral pattern
was carried out using double beam spectrophotometer CARY 50 at 350-1100 nm. The result shows that
pheophytinization of chlorophyll a and b causes hypsochromic shift, particularly at Soret band. There are new peak
formations in Qx region, specifically at 506 and 535 nm for pheophytinized-chlorophyll a, and at 371, 435, 526 and
599 nm for pheophytinized-chlorophyll b."
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