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Articles by Nuanchai Kotsaeng
Total Records ( 2 ) for Nuanchai Kotsaeng
  Yodthong Baimark , Yaowalak Srisuwan , Nuanchai Kotsaeng and Theeraphol Phromsopha
  Methoxy poly(ethylene glycol)-b-poly(ε-caprolactone-co-D,L-lactide) diblock copolymers [MPEG-b-P(CL-co-DLL)] were synthesized by ring-opening polymerization of CL and DLL using MPEG with molecular weight of 5,000 g mol-1 and stannous octoate as the initiating system. Surfactant-free and core-shell nanoparticles of MPEG-b-P(CL-co-DLL) were prepared by modified-spontaneous emulsification solvent diffusion method without any surfactants. Influences of CL:DLL ratio of the diblock copolymers on nanoparticle characteristics were investigated and discussed. The sizes of colloidal nanoparticles obtained from light-scattering analysis were in the range of 84-639 nm. The nanoparticle size decreased with increasing the DLL ratio. Scanning and transmission electron micrographs indicated that the nanoparticles were spherical in shape and smooth surface. Core-shell structure of the nanoparticles consisting of the hydrophilic outer shell of MPEG and the hydrophobic inner core of P(CL-co-DLL) was confirmed by 1H-NMR spectroscopy.
  Kittisak Kerdchan , Nuanchai Kotsaeng and Prasong Srihanam
  Background and Objective: Oxidative compounds are gradually interested and studied, especially agricultural sources for value-added in health and cosmetics. The objective of the present study was to screen the oxidative compounds of the sugarcane (Saccharum officinarum L.) planted in Maha Sarakham Province, Thailand. Materials and Methods: The four cultivars of sugarcane were extracted by ethanol before the screening of phytochemicals; total phenolic, flavonoid, triterpenoid, saponin and condensed-tannin. The extracts were then tested for antioxidation using different assays. Correlation between the phytochemical and antioxidation as well as the individual phenolic compounds were analyzed. Results: All tested phytochemicals found in the node extracts higher content than the rind extracts. The node extracts of all sugarcane cultivars have a higher potent activity than the rind extracts. The phenolic compounds and antioxidation activity were significantly different by cultivars and parts of the sugarcane. All phytochemicals have positively correlated to all tested methods with moderate to high values. The main substances were catechin, quercetin, ferulic acid, resveratrol, gallic acid and epicatechin respectively. Conclusion: The sugarcane is an important source of phytochemicals which expressed high antioxidant activity. It might be used the phytochemicals from the sugarcane for health and beauty applications.
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