Efek Beta Karoten dan Agregasi Klorofil pada Fotostabilitas Klorofil a dalam Pelarut Aseton
| Main Authors: | Junet, F. da Costa, Ferry, F. Karwur, Leenawaty, Limantara |
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| Format: | Article PeerReviewed |
| Terbitan: |
, 2009
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| Subjects: | |
| Online Access: |
http://eprints.upj.ac.id/id/eprint/123/ https://ejournal.unri.ac.id/index.php/JN/article/view/116 |
Daftar Isi:
- Chlorophyll as photosynthetic pigment has many benefits to human such as antioxidant, antibacterial, color additive, immunity, and photosensitizer. Concerning to these applications, chlorophyll a will react with oxygen and light andreduce its effectiveness. It is then important to understand the stability of chlorophyll a on oxygen and light. Stability of chlorophyll a in the presence of beta-carotene (1:1) in acetone was studied for various waterconcentrations. Each solution was exposed to red light (ë e” 630 nm) for 0.5; 1.0; 2.5; 5.0; 10; 20; 30; 40; 50; and 60minutes and their spectrum were analysed. When water was added (8.33; 16.67; 25; 33.33; 41.67; 50; 58.33; 66.67;75; and 83.33 percent) to the acetone solution of chlorophyll a, the chlorophylls aggregate, and in the presence ofbeta-carotene, the chlorophyll more stable. The water shifts the chlorophyll a spectrum toward red duringillumination with or without the presence of carotene. The formation of oligomeric chlorophyll a aggregate occurswithin 10-20 minutes after the water was applied. This strategy of aggregating the chlorophylls to dissipateexcess energy captured from light does not support the photostability of chlorophyll as much as beta-carotene. Surprisingly, when beta carotene was mixed with 66.7% and 75.0% of water, the chlorophyll a degraded 5.56% and9.71% respectively. In conclusion, the aggregate form of chlorophyll a and the presence of beta-carotene increasephotostability of chlorophyll a in acetone solution.