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24 Cards in this Set
- Front
- Back
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dietary fiber is the ___1_ __2_
component of CHO and ___3_ found in __4_ food , __5_ in the __6_ gut may metabolize part it |
1. edible 2. nondigestible
3. lignin 4. PLANT 5. BACTERIA 6. LOWER |
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2 CLASSIFICATIONS OF FIBER
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CRUDE
TOTAL DETARY FIBER (SOL AND INSOL) |
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FUNCTIONAL FIBER
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isolated nonddigestable cho with beneficial physiological effects in human
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how is soluble fibers beneficial
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-attracts water, turning into gel and slowing digestion
-lowers chol (binds with bile acid) -delay glucose absoption |
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how is insoluble fibers beneficial
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speeds passage of food tru the stomach and intestine
-adds bulk to stool, reducing incidende of constipation |
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put the following in order of solubility
1. lignin 2. cellulose 3 beta-glucans 4. gums 5. hemicellulose 6. pectins |
6. 4. 5. 3. 2. 1.
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What is the main 2 extracts in legumes? 4 physiological effects? 3 health benefits?
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1. hemicellulose, other polysaccharides 2. binds bile, inc viscosity, SCFA, fecal 3. decr chol, colon cancer, incr gluc tolerance
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main sources of soluble fiber?
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oat bran, barley, beans and lentils
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main source of insoluble fiber
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wheat bran, vegetables, whole grains
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Cellulose is produced how?
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During photosynthesis, sugars and glucose are manufactured from water and CO2.
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How many glucose units does a long chain of cellulose can contain?
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5000-10000
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What are the 3 enzyme used for digestion when measuring fiber
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Enzymatic digestion
i) α-amylase ii) protease iii) amyloglucosidase |
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what is the formula to claculate total fiber after digestive testing
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tot diet fiber = wt (residue)-wt(ash + protein)
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i) α-amylase
ii) protease iii) amyloglucosidase |
i) α-amylase: gelatinize
ii) protease: remove protein iii) amyloglucosidase: remove starch |
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cellulose
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what is
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hemicellulose
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Lignin
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difference between hemicellulose and cellulose?
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- smaller molecules ~150
-produced from glucose and other sugars such as gal, man, xyl -can be straight or have short side-chains |
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What aree the repeating units cellulose called?
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cellobiose units
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name one hemicellulose ex.?
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glucoronoxylan
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what are lignin classified as:
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non-CHO
phenolics |
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repeating units in fiber are called?
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phenylpropane units
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where are pectins found?
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on pulp of apple and citrus
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hydrolysis of pectin yields which 5 molecules?
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2 sugArs: gAlactose & Aribinose
2 Acids: gAlacturonic acid and Acetic acid 3. Alcohol: methAnol |
