Banca de QUALIFICAÇÃO: KLEISON JOSÉ MEDEIROS LEOPOLDINO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : KLEISON JOSÉ MEDEIROS LEOPOLDINO
DATA : 29/08/2016
HORA: 09:00
LOCAL: Anfiteatro do CCET
TÍTULO:

OBTAINING STARCH MODIFIED PALM FORAGE (Opuntia ficus-indica)

PALAVRAS-CHAVES:

modified starch. spineless cactus. Phosphorylation. Oxidation

PÁGINAS: 175
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
RESUMO:

Obtaining  and  chemical  modification  of  starch  from  forage  Palma  (Opuntia ficus-indica) is the object of study of this work. The starch was extracted from cactus pear  presented  purity  99.30%  and  modified  routes  this  starch  were  oxidation  and phosphorylation  with the assessment of the effects of this change. The starch was modified by sodium periodate to the oxidation process, while for the phosphorylation process  was  varied  the  concentration  of  sodium  tripolyphosphate  compared  to reaction times in order to establish phosphorus limits suitable for use in foods based on Codex Alimentarius . The results showed an increase in phosphorus content to give  maximum  accordance  with  the  rules  in  time  40  minutes  with  7%  sodium tripolyphosphate.  The  results  further  indica ted  that  both  factors  studied  (time, concentration)  influence  the  starch  phosphate  treatment  due  to  the  interaction  of these  independent  variables.  Of  the  properties  evaluated  the  native  and  modified starch were determined chemical composition, phosphorus,   starch, amylose and the shape and size of the starch granules.  Chemical modification of starch caused higher phosphorus  and  ash  and  decreased  levels  of  starch  and  amylose,  achieving experimentally most phosphating according to the legislation in time from  40 minutes to  7%  of  sodium  tripolyphosphate  after  going  through  a  process  dialysis.  The functional  properties  of  the  samples  were  analyzed  on  native  starch  and  modified and  determined  density,  swelling  power,  solubility  index  characterizing  the  gel turbidity,  syneresis,  paste  viscosity,  calorimetric  analysis.  The  native  starch  from cactus pear density showed 1.67 g.mL-1 and the modification decreased the density of native starch. The swelling power and solubility index of the native and modified starch  showed  significant  differences.  The  modification  also  decreased  the absorbance because it facilitates the passage of light, while syneresis was influenced by  modifying,  with  an  increase  in  the  storage  cycle  number,  and  a  decrease  in chemical  modification.  The  phosphate  starch  showed  higher  viscosity  slurry  than native starch because they possess greater power of swelling and solubility rate in water.

MEMBROS DA BANCA:
Presidente - 348475 - DJALMA RIBEIRO DA SILVA
Interno - 7350310 - MARIA DE FATIMA VITORIA DE MOURA
Externo ao Programa - 1549526 - EDVALDO VASCONCELOS DE CARVALHO FILHO
Externo à Instituição - EMILY CINTIA TOSSI DE ARAUJO COSTA - UFRN