What is the chemical shift range of proton NMR?

Table of characteristic proton NMR chemical shifts. type of proton type of compound chemical shift range, ppm RC H 3 1˚ aliphatic 0.9 R 2 C H 2

How do we evaluate the antioxidant activity of chitosan?

Moreover, the antioxidant activity of the chitosan was evaluated by free radical scavenging ability (against DPPH-radical, hydroxyl-radical, and superoxide-radical) and ferric reducing power. Our results suggested that the antioxidant abilities were in the order of DQCS > QCS > CS, which was consistent with the number of quaternized groups.

What is the absorption band of chitosan?

For chitosan, the absorption at around 3400 cm −1 was assigned to the stretching vibration of –OH and –NH 2. The band at around 1600 cm −1 was assigned to the bending vibration of –NH 2.

What is the solubility of chitosan in water?

Chitosan (CS) is an abundant and renewable polysaccharide that is reported to exhibit a great variety of beneficial properties. However, the poor solubility of chitosan in water limits its applications.

What is the chemical shift range of proton type of compound?

type of proton type of compound chemical shift range, ppm RC H 3 1˚ aliphatic 0.9 R 2 C H 2 2˚ aliphatic 1.3 R 3 C H 3˚ aliphatic 1.5

What is the molecular formula of 5-methyl-2-hexanol?

5-Methyl-2-hexanol PubChem CID 12323 Molecular Formula C7H16O Synonyms 5-METHYL-2-HEXANOL 5-Methylhexan-2-ol 62 Molecular Weight 116.20 Date s Modify 2021-05-22 Create 2005-03-27

Does 5-methyl-2-hexanone exist as a vapor in the atmosphere?

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere (1), 5-methyl-2-hexanone, which has a vapor pressure of 5.77 mm Hg at 25 °C (2), is expected to exist solely as a vapor in the ambient atmosphere.