02459nas a2200265 a 450000500170000000800410001703500150005810000190007324501020009226000670019430000330026149000550029450002060034950200830055552011600063865000170179865000110181570000390182670000450186570000450191071000470195571000660200281000600206885600650212820260817162802.0150617s2010    th uu|m rtt   0|  a1eng d  a.b121535151 aRehman, Zia Ur10aAntioxidant and antimicrobial activity of ultrasonic-assisted extracts of local longan fruit peel  aPathum Thani, Thailand :bAsian Institute of Technology,c2010  a38 leave :bill. (some col.)1 aResearch Studies Project Report ;vno. no.FB-10-01  aA Research study submitted in partial fulfillment of the requirements for the Degree of Master of Science in Food Engineering and Bioprocess Technology, School of Environment, Resources and Development  aResearch Studies Project Report (M. Eng.) - Asian Institute of Technology,2010  aThe  longan  sample  was  extracted  with  95%  ethanol  by  ultrasonic-assisited  method.  The total  optimum  phenolic  contents  of  longan peel  with  the  help  of  ultrasonic  method  were 48.48mg/g at extraction temperature of 600C which was kept for 60minutes while the least values was observed at extraction temperature of  400C for 40minutes which is 24.48mg/g of  the  extract  being  expressed  as  gallic  acid  equivalent.  The  sample  was  measured  at 760nm  by  using  Folin-Ciocalteu  method.  The  kinetic  properties  of  antioxidants  were investigated  by  reacting  specific  quantity  of  extract  with  2.2-diphenyl-1-picrylhydrazyl (DPPH) radical and the reducing power was determined by mixing the longan extract with a number of different chemical species. The highest scavenging activity was shown by the sample  extracted  on  600C,  60minutes.  The  extraction  temperature  of  60C  and  60minutes extraction time were found tobe the optimum for antioxidants extraction The antibacterial activity of longan  extract was tested against E.Coliand strong activity was observed with distinct inhibition zones around the wells 0aAntioxidants 0aLongan1 aRakshit, Sudip Kumar,eChairperson0 aAthapol Noomhorm,eExamination Committee1 aAnal, Anil Kumar,eExamination Committee2 aUniversity of Balochistan, Quetta Pakistan2 aAsian Institute of Technology Fellowship, eScholarship donor2 aAsian Institute of Technology.tRSPR ;vno. no.FB-10-01  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B00062