- Teks
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still owned the characteristic of c
still owned the characteristic of chirality like agar molecule. This
may be the reason why agar acetate and raw agar had the similar
variation trend of solution optical rotation on cooling. However,
the introduction of acetyl group could lower the solution optical
rotation value of raw agar. The variation process of agar molecules
in solution from coil to helix could be observed not only in a higher
concentration solution (0.25 wt%) at which the solution could form
a gel, but also in a lower concentration solution (0.05 wt%) at which
even the solution could not form a gel. The temperature of the transition beginning point (from coil to helix) of the agar molecules
was higher in a higher concentration solution (0.25 wt%) than that
in a lower concentration solution (0.05 wt%), but its temperature
of the transition end point (from coil to helix) was almost the
same in both higher and lower concentration solution. As for this,
it might be attributed to that the probability of collision between
agar molecules was greater in the higher concentration solution
than that in the lower concentration solution. Meanwhile, it could
be also found that the temperature of the transition end point of
agar acetate was obviously lower than that of raw agar.
3.4. Rheological studies
The solution apparent viscosity of raw agar and its acetates at
different temperature was shown in Fig. 4.
It could be seen from Fig. 4 that the solution apparent viscosity values of raw agar and agar acetates increased gradually as
the temperature decreased, and the increase amplitude of solution
apparent viscosity for all samples was small at the temperature
above 50
◦
C. All solution apparent viscosity values of agar acetates
were lower than the one of raw agar under the same conditions,
and the solution of the agar acetates with bigger DS had lower
viscosity. It could be found from Fig. 3 above that the molecules
of both raw agar and agar acetate began to change from single
coil to double helix when the temperature was lower than 70
◦
C.
may be the reason why agar acetate and raw agar had the similar
variation trend of solution optical rotation on cooling. However,
the introduction of acetyl group could lower the solution optical
rotation value of raw agar. The variation process of agar molecules
in solution from coil to helix could be observed not only in a higher
concentration solution (0.25 wt%) at which the solution could form
a gel, but also in a lower concentration solution (0.05 wt%) at which
even the solution could not form a gel. The temperature of the transition beginning point (from coil to helix) of the agar molecules
was higher in a higher concentration solution (0.25 wt%) than that
in a lower concentration solution (0.05 wt%), but its temperature
of the transition end point (from coil to helix) was almost the
same in both higher and lower concentration solution. As for this,
it might be attributed to that the probability of collision between
agar molecules was greater in the higher concentration solution
than that in the lower concentration solution. Meanwhile, it could
be also found that the temperature of the transition end point of
agar acetate was obviously lower than that of raw agar.
3.4. Rheological studies
The solution apparent viscosity of raw agar and its acetates at
different temperature was shown in Fig. 4.
It could be seen from Fig. 4 that the solution apparent viscosity values of raw agar and agar acetates increased gradually as
the temperature decreased, and the increase amplitude of solution
apparent viscosity for all samples was small at the temperature
above 50
◦
C. All solution apparent viscosity values of agar acetates
were lower than the one of raw agar under the same conditions,
and the solution of the agar acetates with bigger DS had lower
viscosity. It could be found from Fig. 3 above that the molecules
of both raw agar and agar acetate began to change from single
coil to double helix when the temperature was lower than 70
◦
C.
0/5000
masih memiliki karakteristik chirality seperti agar-agar molekul. Inimungkin alasan mengapa agar-agar asetat dan agar mentah harus serupatren variasi rotasi optis solusi pada cooling. Namun,Pengenalan asetil bisa menurunkan solusi optiknilai rotasi agar mentah. Proses variasi agar molekuldi solusi dari coil untuk helix dapat dilihat tidak hanya di yang lebih tinggikonsentrasi solusi (0.25 wt %) di mana solusi yang bisa membentukgel, tetapi juga dalam konsentrasi rendah solusi (0.05 wt %) di manabahkan solusinya tidak bisa membentuk gel. Suhu transisi mulai titik (dari coil untuk helix) agar molekullebih tinggi dalam konsentrasi yang lebih tinggi solusi (0.25 wt %) daripada yangdalam larutan konsentrasi rendah (0.05 wt %), tetapi suhutransisi titik akhir (dari coil untuk helix) adalah hampirsama di kedua yang lebih tinggi dan lebih rendah solusi konsentrasi. Seperti ini,mungkin disebabkan bahwa kemungkinan tumbukan antaraagar molekul adalah lebih besar dalam larutan konsentrasi yang lebih tinggidaripada solusi konsentrasi yang lebih rendah. Sementara itu, bisadapat juga menemukan bahwa suhu transisi titik akhir dariagar asetat adalah jelas lebih rendah daripada agar-agar mentah.3.4. rheological studiViskositas jelas solusi agar mentah dan asetat yang disuhu berbeda ditunjukkan dalam gambar 4.Hal ini bisa dilihat dari 4 gambar yang jelas viskositas solusi nilai mentah agar-agar dan agar asetat meningkat secara bertahap sebagaisuhu menurun, dan amplitudo peningkatan solusiviskositas yang jelas untuk semua sampel masih kecil suhudi atas 50◦C. semua solusi jelas viskositas nilai agar-agar asetatlebih rendah dari salah satu mentah agar-agar dalam kondisi yang sama,dan solusi asetat agar-agar dengan DS lebih besar lebih rendahviskositas. Hal ini dapat ditemukan dari Fig. 3 di atas bahwa molekuldari agar-agar mentah maupun agar-agar asetat mulai berubah dari singleCoil untuk heliks ganda ketika suhu yang lebih rendah dari 70◦C.
Sedang diterjemahkan, harap tunggu..
still owned the characteristic of chirality like agar molecule. This
may be the reason why agar acetate and raw agar had the similar
variation trend of solution optical rotation on cooling. However,
the introduction of acetyl group could lower the solution optical
rotation value of raw agar. The variation process of agar molecules
in solution from coil to helix could be observed not only in a higher
concentration solution (0.25 wt%) at which the solution could form
a gel, but also in a lower concentration solution (0.05 wt%) at which
even the solution could not form a gel. The temperature of the transition beginning point (from coil to helix) of the agar molecules
was higher in a higher concentration solution (0.25 wt%) than that
in a lower concentration solution (0.05 wt%), but its temperature
of the transition end point (from coil to helix) was almost the
same in both higher and lower concentration solution. As for this,
it might be attributed to that the probability of collision between
agar molecules was greater in the higher concentration solution
than that in the lower concentration solution. Meanwhile, it could
be also found that the temperature of the transition end point of
agar acetate was obviously lower than that of raw agar.
3.4. Rheological studies
The solution apparent viscosity of raw agar and its acetates at
different temperature was shown in Fig. 4.
It could be seen from Fig. 4 that the solution apparent viscosity values of raw agar and agar acetates increased gradually as
the temperature decreased, and the increase amplitude of solution
apparent viscosity for all samples was small at the temperature
above 50
◦
C. All solution apparent viscosity values of agar acetates
were lower than the one of raw agar under the same conditions,
and the solution of the agar acetates with bigger DS had lower
viscosity. It could be found from Fig. 3 above that the molecules
of both raw agar and agar acetate began to change from single
coil to double helix when the temperature was lower than 70
◦
C.
may be the reason why agar acetate and raw agar had the similar
variation trend of solution optical rotation on cooling. However,
the introduction of acetyl group could lower the solution optical
rotation value of raw agar. The variation process of agar molecules
in solution from coil to helix could be observed not only in a higher
concentration solution (0.25 wt%) at which the solution could form
a gel, but also in a lower concentration solution (0.05 wt%) at which
even the solution could not form a gel. The temperature of the transition beginning point (from coil to helix) of the agar molecules
was higher in a higher concentration solution (0.25 wt%) than that
in a lower concentration solution (0.05 wt%), but its temperature
of the transition end point (from coil to helix) was almost the
same in both higher and lower concentration solution. As for this,
it might be attributed to that the probability of collision between
agar molecules was greater in the higher concentration solution
than that in the lower concentration solution. Meanwhile, it could
be also found that the temperature of the transition end point of
agar acetate was obviously lower than that of raw agar.
3.4. Rheological studies
The solution apparent viscosity of raw agar and its acetates at
different temperature was shown in Fig. 4.
It could be seen from Fig. 4 that the solution apparent viscosity values of raw agar and agar acetates increased gradually as
the temperature decreased, and the increase amplitude of solution
apparent viscosity for all samples was small at the temperature
above 50
◦
C. All solution apparent viscosity values of agar acetates
were lower than the one of raw agar under the same conditions,
and the solution of the agar acetates with bigger DS had lower
viscosity. It could be found from Fig. 3 above that the molecules
of both raw agar and agar acetate began to change from single
coil to double helix when the temperature was lower than 70
◦
C.
Sedang diterjemahkan, harap tunggu..
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