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Table 3 Effects of nitrogen source supplementation on ethanol production and sugar consumption

From: Conditions promoting effective very high gravity sugarcane juice fermentation

 

PE-2

CAT-1

Ethanol (ml L−1)

Consumed sugar (g L−1)

Ethanol (ml L−1)

Consumed sugar (g L−1)

°Brix

25

30

35

25

30

35

25

30

35

25

30

35

Ammonium phosphate (DAP)

 Fermentation cycle

1

106.9 aB

95.5 bE

84.9 cG

nd

nd

nd

120.8 bD

128.7 aG

130.9 aD

nd

nd

nd

2

139.2 bA

146.7 aBC

140.6 bAB

255.1 cA

240.0 bDE

278.0 aE

148.2 aAB

153.2 aDE

151.3 aA

244.1 bB

309.0 bF

259.9 aA

3

139.4 aA

138.0 aD

138.4 aBC

nd

nd

nd

135.3 bC

129.6 bG

150.3 aA

nd

nd

nd

4

142.9 aA

144.4 aC

144.6 aAB

255.0 cA

243.9 bCD

291.6 aF

146.8 aAB

145.2 aEF

146.0 aAB

242.8 bAB

307.6 bEF

258.8 aA

5

138.9 cA

157.8 aA

146.8 bA

nd

nd

nd

142.6 bABC

149.3 aEF

149.6 aA

nd

nd

nd

6

141.6 bA

158.4 aA

142.0 bAB

255.1 cA

269.9 bF

278.8 aE

140.7 aBC

143.9 aF

145.1 aABC

237.7 bAB

299.6 bDEF

254.5 aA

 AVERAGE

(ml L−1)

134.8

140.1

132.9

–

–

–

139.1

141.7

145.5

–

–

–

 SUM

(ml)

8089

8408

7973

–

–

–

8344

8499

8732

–

–

–

Urea

 Fermentation cycle

1

112.7 aB

97.2 bE

69.6 cH

nd

nd

nd

135.6 aC

126.8 bG

136.6 aCD

nd

nd

nd

2

142.9 aA

146.3 aBC

116.4 bF

255.1 cA

65.2 bC

184.8 aA

151.1 bA

174.4 aA

149.1 bA

244.1 cB

294.6 bDE

250.1 aA

3

142.2 aA

142.9 aCD

125.2 bF

nd

nd

nd

149.2 aAB

79.3 bH

148.1 aA

nd

nd

nd

4

141.0 bA

152.2 aAB

129.6 cDE

255.0 cA

65.6 bC

207.0 aC

148.8 bAB

160.9 aCD

148.8 bA

243.8 cAB

276.8 bC

256.6 aA

5

141.2 bA

153.2 aA

132.3 cCD

nd

nd

nd

149.6 bA

165.3 aBC

147.2 bAB

nd

nd

nd

6

139.4 bA

158.2 aA

127.7 cDE

255.2 cA

48.7 bE

211.7 aC

143.5 bABC

171.0 aAB

138.9 bBCD

244.1 cB

289.2 bCD

258.7 aA

 AVERAGE

(ml L−1)

137.6

141.7

116.8

–

–

–

146.3

146.3

144.8

–

–

–

 SUM

(ml)

8194

8500

7008

–

–

–

8778

8777

8687

–

–

–

  1. Results are shown for ammonium phosphate and urea supplemented very high gravity sugar cane juice fermentations with S. cerevisiae strains PE-2 and CAT-1 at 25, 30 and 35 °Brix. The results given are for the end of each 24-h fermentative cycle and are the average of three independent assays. Significantly different values are identified by different letters; different lower case letters indicate statistical differences within each fermentation batch, whereas different capital letters indicate statistical differences between different fermentation batches. Italics: maximum ethanol concentration produced by each strain. The aggregated cumulative value of ethanol produced at the end of the full six cycles is also shown (ml) as well as the corresponding relative production in   ml L−1
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Biotechnology for Biofuels and Bioproducts

ISSN: 2731-3654

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