Food Analysis (FST306)
INTRODUCTION AND SAMPLE PREPARATION (CHAPTER 1)
SAMPLE PREPARATION
SAMPLE PRESERVATION
EVALUATION OF ANALYTICAL DATA
MOISTURE (CHAPTER 2)
METHODS FOR MOISTURE DETERMINATION
Subtopic
OVEN DRYING METHOD
DISTILLATION METHODS
CHEMICAL REACTION METHODS
KARL-FISCHER TITRATION
PRINCIPLES
ADVANTAGES OF KARL-FISCHER TITRATION
DISADVANTAGES
CRUDE FAT (CHAPTER 3)
SOLVENT EXTRACTION METHODS
GOLFISCH METHOD (CONTINUOUS SOLVENT EXTRACTION)
SOXHLET METHOD (SEMI-CONTINUOUS SOLVENT EXTRACTION)
MOJONNIER METHOD (DISCONTINUOUS SOLVENT METHOD)
PRINCIPLE
SAMPLE PREPARATION
PROCEDURE
ADVANTAGES OF MOJONNIER METHOD
NON-SOLVENT WET EXTRACTION METHODS
BABCOCK METHOD FOR MILK FAT
GERBER METHOD FOR MILK FAT
DETERGENT METHOD
PROTEIN ANALYSIS (CHAPTER 4)
METHODS OF PROTEIN ANALYSIS
KJEDAHL METHOD
PRINCIPLE
ADVANTAGES OF KJEDAHL METHOD
DISADVANTAGES
Time consuming
Corrosive reagent
Different proteins need different correction factors
Does not give a measure of the true protein
measures total organic nitrogen
UV-VISIBLE SPECTROSCOPY
METHODS
BIURET METHOD
PRINCIPLE
PROCEDURE
ADVANTAGES OF BIURET METHOD
DISADVANTAGES OF BIURET METHOD
LOWRY METHOD
PRINCIPLE
PROCEDURE
1) Proteins to be analyzed is diluted to an appropriate range (20 to 100mg)
2) Biuret reagent is added to the diluted sample and incubated at room temperature for 10 min.
3) Freshly prepared Folin reagent is
The absorbance of the solution is read at 650nm
ADVANTAGES OF LOWRY METHOD
DISADVANTAGES OF LOWRY METHOD
DYE BINDING METHOD
PRINCIPLE
ADVANTAGES OF DYE BINDING
DISADVANTAGES OF DYE BINDING
CARBOHYDRATE (CHAPTER 5)
CHEMICAL METHODS FOR MONO- AND OLIGOSACCHARIDES
LANE-EYNON METHOD (TITRATION)
PRINCIPLE
PROCEDURES
APPLICATIONS
DISADVANTAGES OF LANE-EYNON METHOD
MUNSON-WALKER METHOD (GRAVIMETRIC)
PRINCIPLE
ADVANTAGES
DISADVANTAGES
NELSON-SOMOGYI METHOD (COLORIMETRIC)
PRINCIPLE
PHYSICAL METHODS
POLARIMETRY
PRINCIPLE
DISADVANTAGES
REFRACTIVE INDEX (RI) MEASUREMENT
PRINCIPLE
APPLICATIONS
DIETARY FIBER (CHAPTER 6)
FIBRE DETERMINATION METHODS
ACID AND ALKALI DIGESTION METHOD
PRINCIPLE
PROCEDURE
DISADVANTAGES
AOAC METHOD (TOTAL, INSOLUBLE & SOLUBLE FIBRE)
PRINCIPLE
APPLICATION
DISADVANTAGE
ENGLYST-CUMMINGS METHOD
PRINCIPLE
APPLICATION
THEANDER-MARLETT METHOD
PRINCIPLE
PROCEDURE
APPLICATIONS
ASH & MINERAL (CHAPTER 7)
TYPES OF ASHING
DRY ASHING
PRINCIPLES
ADVANTAGES
DISADVANTAGES
WET ASHING
PRINCIPLE
ADVANTAGES
DISADVANTAGES
LOW-TEMPERATURE PLASMA ASHING
PRINCIPLE
ADVANTAGES
DISADVANTAGES
WATER SOLUBLE & WATER INSOLUBLE ASH
PROCEDURE
ACID INSOLUBLE ASH
PROCEDURE
ALKALINITY OF ASH
PROCEDURE
ADVANTAGES
VITAMIN (CHAPTER 8)
PHYSIOCHEMICAL METHODS
VITAMIN A
COLORIMETRIC METHOD
PRINCIPLE
PRECAUTIONS
HPLC METHOD
VITAMIN C
2,6-DICHLOROPHENOLINDOPHENOL TITRIMETRIC METHOD
PRINCIPLE
METHODS
FLUOROMETIC METHOD
PRINCIPLE
THIAMINE ( VITAMIN B1)
THIOCHROME FLUOROMETRIC METHOD
PRINCIPLE
METHOD
PRECAUTION
NIANCIN ( VITAMIN B3)
COLOURIMETRIC METHOD
PRINCIPLE
HPLC