2. ข
ซึ่ ง พ บ ว่า มีป ริม า ณ ส า ร แ ท น นิ น สูง ที่ สุ ด คื อ 707.17
มิลลิกรัมต่อกิโลกรัม นาหนักแห้ง
SENIOR PROJECT TITLE STUDY AND
COMPARISON VARIOUS SOLVENTS AND TIME IN
EXTRACTION OF TANNIN FROM
KLUAI NAMVA PEELS
DEGREE BACHELOR OF EDUCATION
(CHEMISTRY)
BY MISS SAMITANAN
KHOTSOMBAT
MISS SUKUNYA KIMKAMON
MR.CHANADON JOKNGERN
ADVISOR DR.AUNGKANA CHATKON
INSTITUTION NAKHON RATCHASIMA
RAJABHAT UNIVERSITY
ACADEMIC YEAR 2013
3. ค
ABSTRACT
The aim of this research was to study conditions and
extraction efficiency of a range of aqueous mixtures
acetone - water and ethanol - water as solvent ( 50%,
60%, 70%, 80% and 90% v/v, respectively) for extraction
of tannin from Kluai Namva peels in a range of time at 1,
3, 5 and 7 hour. Solvent extraction by Soxhlet and total
tannins determination by Folin - Denis reagent were
used. The UV absorbance of tannins were measured at
762 nm after colour development. The results showed
that acetone - water mixtures 60% (v/v) for 5 hour is the
most effective extraction with the highest tannin 707.17
mg/kg (dry sample weight).