Near-Infrared Spectrophotometric Determination of Tri- and Tetrapeptides

Tran, Chieu D.; Kong, Xiangrong

doi:10.1006/abio.2000.4768

Cited by 15 publications

(11 citation statements)

References 11 publications

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“…These can be attributed to the overtone and combination transition of the –OH groups. Since CS also possesses the same O-H groups in addition to N-H 2 group, NIR spectra of CS powder and film (4D) also have additional bands at around 1548nm and 2028nm which expectedly can be attributed to the –NH modes [57–60]. The similarity between the NIR spectra of starting polysaccharides and regenerated polysaccharide further confirms that CEL and CS were successfully regenerated by this preparation method.…”

Section: Resultsmentioning

confidence: 76%

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Chitosan-cellulose composite materials: Preparation, Characterization and application for removal of microcystin

Tran

Duri

Delneri

et al. 2013

Journal of Hazardous Materials

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108

123

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We developed a simple and one-step method to prepare biocompatible composites from cellulose (CEL) and chitosan (CS). [BMIm+Cl−], an ionic liquid (IL), was used as a green solvent to dissolve and prepare the [CEL+CS] composites. Since majority (>88%) of IL used was recovered for reuse by distilling the aqueous washings of [CEL+CS], the method is recyclable. XRD, FTIR, NIR, 13C CP-MAS-NMR and SEM were used to monitor the dissolution and to characterize the composites. The composite was found to have combined advantages of their components: superior mechanical strength (from CEL) and excellent adsorption capability for microcystin-LR, a deadly toxin produced by cyanobacteria (from CS). Specifically, the mechanical strength of the composites increased with CEL loading; e.g., up to 5X increase in tensile strength was achieved by adding 80% of CEL into CS. Kinetic results of adsorption confirm that unique properties of CS remain intact in the composite, i.e., it is not only a very good adsorbent for microcystin but also is better than all other available adsorbents. For example, it can adsorb 4X times more microcystin than the best reported adsorbent. Importantly, the microcystin adsorbed can be quantitatively desorbed to enable the composite to be reused with similar adsorption efficiency.

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Section: Resultsmentioning

confidence: 76%

“…NIR spectra were taken on a home-built NIR spectrometer based on an acoustooptic tunable filter. Information on this NIR spectrometer was described in detail in our previous papers [45, 46]. Normally, each spectrum was an average of 30 spectra taken at 1-nm intervals from 1450 to 2450 nm.…”

Section: Methodsmentioning

confidence: 99%

Chitosan-cellulose composite materials: Preparation, Characterization and application for removal of microcystin

Tran

Duri

Delneri

et al. 2013

Journal of Hazardous Materials

Self Cite

108

123

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“…27,28 FT-IR spectra were measured on a PerkinElmer 100 spectrometer at 2 cm −1 resolution with either KBr or by a ZnSe single reflection ATR accessory (Pike Miracle ATR). X-ray diffraction (XRD) measurements were taken on a Rigaku MiniFlex II diffractometer equipped with a Cu Kα source.…”

Section: Methodsmentioning

confidence: 99%

Recyclable synthesis, characterization, and antimicrobial activity of chitosan‐based polysaccharide composite materials

Tran

Duri

Harkins

2013

J Biomedical Materials Res

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106

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We have successfully developed a simple and totally recyclable method to synthesize novel, biocompatible and biodegradable composite materials from cellulose (CEL) and chitosan (CS). In this method, [BMIm+Cl−], an ionic liquid (IL), was used as a green solvent to dissolve and synthesize the [CEL+CS] composites. Since the IL can be removed from the composites by washing them with water, and recovered by distilling the washed solution, the method is totally recyclable. Spectroscopic and imaging techniques including XRD, FTIR, NIR and SEM were used to monitor the dissolution, to characterize and to confirm that CEL and CS were successfully regenerated. More importantly, we have successfully demonstrated that [CEL+CS] composite is particularly suited for many applications including antimicrobial property. This is because the composites have combined advantages of their components, namely superior chemical and mechanical stability (from CEL) and bactericide (from CS). Results of tensile strength measurements clearly indicate that adding CEL into CS substantially increase its tensile strength. Up to 5X increase in tensile strength can be achieved by adding 80% of CEL into CS. Results of in vitro antibacterial assays confirm that CS retains its antibacterial property in the composite. More importantly, the composites reported here can inhibit growth of wider range of bacteria than other CS-based materials prepared by conventional methods; i.e., over 24 hr period, the composites substantially inhibited growth of bacteria such as MRSA, VRE, S. aureus, E. coli. These are bacteria which are often found to have the highest morbidity and mortality associated with wound infections.

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“…Such a spectrometer was successfully constructed in our laboratory using the acoustooptic tunable lter. [25][26][27] An acousto-optic tunable lter (AOTF) is an all-solidstate, electronic dispersive device that is based on the diffraction of light by acoustic waves in an anisotropic crystal. [28][29][30] The wavelength of the diffracted light is dependent on the frequency and the power of the applied acoustic wave.…”

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confidence: 99%

Absorption of Water by Room-Temperature Ionic Liquids: Effect of Anions on Concentration and State of Water

2003

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Near-infrared (NIR) spectrometry was successfully used for the non-invasive and in situ determination of concentrations and structure of water absorbed by room-temperature ionic liquids (RTILs). It was found that RTILs based on 1-butyl-3-methylimidazolium, namely, [BuMIm]+ [BF4]-, [BuMIm]+ [bis((trifluoromethyl)sulfonyl)amide, or Tf2N]- and [BuMIm]+ [PF6]-, are hydroscopic and can quickly absorb water when they are exposed to air. Absorbed water interacts with the anions of the RTILs, and these interactions lead to changes in the structure of water. Among the RTILs studied, [BF4]- provides the strongest interactions and [PF6]- the weakest. In 24 hours, [Bu-MIm]+ [BF4]- can absorb up to 0.320 M of water, whereas [Bu-MIm]+ [PF6]- can only absorb 8.3 x 10(-2) M of water. It seems that higher amounts of water can be absorbed when the anion of the RTIL can strongly interact and hence stabilize absorbed water molecules by forming hydrogen bonds with them or inducing hydrogen bonds among water molecules. More importantly, the NIR technique can be sensitively used for the noninvasive, in situ determination of absorbed water in RTILs, without any pretreatment, and at limits of detection as low as 3.20 x 10(-3) M.

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Near-Infrared Spectrophotometric Determination of Tri- and Tetrapeptides

Cited by 15 publications

References 11 publications

Chitosan-cellulose composite materials: Preparation, Characterization and application for removal of microcystin

Chitosan-cellulose composite materials: Preparation, Characterization and application for removal of microcystin

Recyclable synthesis, characterization, and antimicrobial activity of chitosan‐based polysaccharide composite materials

Absorption of Water by Room-Temperature Ionic Liquids: Effect of Anions on Concentration and State of Water

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