04980nas a2200481 a 4500 20260817163519.0 190321s2016 th uu m rtt 0| a1eng d .b12299650 AIT Thesis no.FB-16-06 Singh, Manisha Assessment of bioactive components in dammar extracts and exploration of composite film based on dammar. Pathum Thani, Thailand : Asian Institute of Technology, 2016 90 leaves : ill. + 1 online resource Thesis ; no.FB-16-06 A thesis submitted in partial fulfillment of the requirements for thedegree of Master of ScienceinFood Engineeringand Bioprocess Technology, School of Environment, Resources and Development Thesis (M. Sc.) - Asian Institute of Technology, 2016 Plant sourceshave been extensively investigated for bioactive compounds for their potential applications in food, feed, pharmaceutics, biotechnology and medical applications. Dammar, a plantresin, is the secondary metabolite secreted by many species of family Dipterocarpacae. Though having highpotential bioactive properties and high value, dammar has still been underutilized and fewer investigations have been conducted. Ultrasoundassisted extractionwas applied for the extraction of bioactive constituents from dammar inwhich ethanolwas used as solvent.The effect of three independent variables; ethanol concentration, volume of solvent used and extraction time on the extraction yield, total phenolic content, total flavonoid content, antioxidant activity as scavenging activity of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and ferricreducing antioxidant power (FRAP) assay and reducing powerwas examined by response surface methodology (RSM) together with Box-Behnkendesign. The optimized conditionsfor bioactive extraction as predicted by RSM were99.8% ethanol(v/v), 30 ml volume of solvent per gof raw materialsand 40 minof extractiontime. The extraction yield at theseconditionswas 46.40%. Similarly, the optimal ultrasonic-assisted conditionsfor extraction of phenolic, antioxidantand reducing compounds wereestablished as ethanolconcentration of 60%(v/v), 10 ml volume of solvent per g of raw materials and extraction time of60 min. Under these conditions, the total phenolic content, antioxidant activity as %DPPH, antioxidant activity as FRAP and reducing power were17.18 mg gallic acid equivalent/ g, 83.97 %, 877.874 omol/g and 23.01ascorbic acid equivalent/ grespectively.Statistically, only concentration of ethanol indicated significant effect on the bioactive properties of extract.In addition, the extractsfrom lowerconcentration of ethanol also exhibited antibacterial property against gram positive bacteria(Streptococcus agalactiaeand Staphylococcus aureus). Furthermore, dammar have been explored to develop the composite film with gelatin. Thethickness, water vapor permeability, tensile strength, elongation at break and color propertiesof different films with varying proportion of dammar and gelatin were evaluated. The composite films demonstrated satisfactory physicochemical properties having probableapplication in the field of food and pharmaceutical industries. Bioactive compounds. Plant bioactive compounds Mecidinal plants Anil Kumar Anal, Chairperson Athapol Noomhorm, Examination Committee Loc Thai Nguyen, Examination committee Asian Development Bank{u2013}Japan Scholarship Program (ADB-JSP), Scholarship donor Asian Institute of Technology. Thesis ; no. no.FB-16-06 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B02855 .b12299650 mnait t 240925 0 190321 m a t 0 000:001:PDF:b1229965:003958:0:0:0:0:0:0 Click to view Abstract n mnait mnait mnarc mnarc 20 40 61 Barcode : 30050120547731 CREATED : 2019-03-21 RECORD # : i13162809 LPATRON : 1028262 LCHKIN : 2020-05-01 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 1 Barcode : 30050120547707 CREATED : 2019-03-21 RECORD # : i13162810 LPATRON : 1028546 LCHKIN : 2019-11-26 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 2 TOT CHKOUT : 2 TOT RENEW : 3 Barcode : 30050120894505 CREATED : 2019-05-23 RECORD # : i13188318 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : - CREATED : 2019-05-23 RECORD # : i1318832x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 8985 8985 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.FB-16-06 30050120547731 2026-08-17 16:35:19 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.FB-16-06 30050120547707 2026-08-17 16:35:19 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.FB-16-06 30050120894505 2026-08-17 16:35:19 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.FB-16-06 2026-08-17 16:35:19 2026-08-17 61