Nattiya Chanthawongsa. การพัฒนาการแปรรูปเปลือกทุเรียนและเปลือกกล้วยน้ำว้าเป็นน้ำตาลสำหรับการผลิตเอทานอลโดยกระบวนการหมักทางชีวภาพ. ปริญญาโท(เทคโนโลยีชีวเคมี). King Mongkut's University of Technology Thonburi. KMUTT Library. : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี, 2553.
Abstract:
Durian peel and banana peel are agricultural by-products and thus have low economic values. The
production of bio-ethanol from durian peel was studied by using separate hydrolysis and
fermentation (SHF) and simultaneous saccharification and fermentation (SSF). Different methods of
pretreatment were investigated for improving the saccharification in ethanol fermentation, Durian
peel pretreatment procedures included distillated water, diluted sodium hydroxide and diluted
sulphuric acid at 121 C under pressure of 15 lb/inch2 for 20 min. The results showed that the diluted
su'phuric acid pretreatment of durian peel at 1.5% water-insoluble solids (WIS) produced the
highest reducing sugars yield and the optimum concentration of diluted sulphuric acid for the
biomass pretreatment was 1 M. The pretreated substrates were hydrolysed with a blend of amylase,
amyloglucosidase, xylanase, cellulase and pectinase. The fermentable sugars hydrolysate were
bioconverted to ethanol with'SHF and SSF, using co-culture of Saccharomyces cerevisiae 5221 and
Candida tropica/is 5048. The highest yield coefficient [g(g-total sugar)-1] in SHF (0.40) was
obtained with co-culture of S. cerevisiae 5221 and C. tropica/is 5048 in the culture ratio of 1:2. The
durian peel concentrations varied at 1.5g%, 5 g% and 10 g% (w/v) and ethanol yield per unit
biomass (g(g-biomass)-1), were 0.34, 0.26 and 0.10, respectively. The highest product (ethanol)
yield coefficient (g(g-total sugar)-1) in SSF (0.48) was obtained from co-culture of S. cerevisiae and
C. tropicalis in the culture ratio of 1:2. The durian peel concentrations varied at 1.5g%, 5 g% and 10
g% (w/v) and ethanol yield per unit biomass (g(g-biomass)-1), were 0.40, 0.33 and 0.11,
respectively. When comparison between SSF and SHF by using 1.5 g% durian peel as substrate on
producing the highest ethanol yield per unit biomass, the SSF process time was shorter (16-20 h)
than that for the SHF (~48 h), leading to significantly increased maximum ethanol concentration
for the former process (5.27 g/l for SSF; 4.50 g/l for SHF).
The production of bio-ethanol from banana peel was studied by using separate hydrolysis and
fermentation (SHF) and simultaneous saccharification and fermentation (SSF). Different methods of
pretreatment were investigated for improving the saccharification in ethanol fermentation. Banana
peel pretreatment procedures included distillated water, 0.025% sodium hydroxide and 0.1 M
sulphuric acid at 121 C under pressure of 15 lb/inch2 for 20 min. The results showed that 0.1 M
sulphuric acid pretreatment of banana peel at 1.5% water-insoluble solids (WIS) produced the
highest ethanol concentration by using monoculture of S. cerevisiae 5221 in SSF process. Different
methods of pretreatment were investigated for improving the saccharification in ethanol
fermentation. Banana peel pretreatment procedures included: 1.0 M sulphuric acid at 121 C and
135 C under pressure of 15 lb/inch2 for 20-60 min. The pretreated substrates were hydrolysed with a
blend of amylase, amyloglucosidase, xylanase, cellulase and pectinase. The fermentable sugars
hydrolysate were bioconverted to ethanol with SHF and SSF, using co-culture of S. cerevisiae and
C. tropicalis in the ratio of 1:2. The highest product (ethanol) yield coefficient (g(g- total sugar)-1)
(0.52) and ethanol concentration (7.77 g/l) in SHF were obtained from banana peel pretreatment
procedures 1.0 M sulphuric acid at 135 C under pressure of 15 lb/inch2 for 60 min. The highest
product (ethanol) yield coefficient (g(g- total sugar)-1 (0.61) and ethanol concentration (9.12 g/l) in
SSF were obtained from banana peel pretreatment procedures 1.0 M sulphuric acid at 135 C under
pressure of 15 lb/inch2 for 60 min. When comparison between SSF and SHF by using of 1.5 g%
banana peel as substrate on producing the ethanol yield per unit biomass, the SSF process time was
shorter (16-20 h) than that for the SHF (~48 h), leading to significantly increased maximum
ethanol concentration (9.12 g/l for SSF; 7.77 g/l for SHF) and ethanol production rate for the former
process (0.96 gll/hour for SSF; 0..41 g/l/hour for SHF). 0.75g% Banana pulp pretreated with 1.0 M
sulphuric acid at 121 C under pressure of 15 lb/inch2 for 20 min produced the product (ethanol)
yield coefficients (g(g-total sugar)-1) of 0.35 and 0.45 and maximum ethanol concentrations of 5.23
and 6.77 g/l, in SSF processes of batch volume of 50 ml and 60 l, respectively. The result showed
that banana pulp could be used as substrate in the fermentation process with high ethanol yield
production.
King Mongkut's University of Technology Thonburi. KMUTT Library