Chemical Modification of Gums

Towle, Gordon A.; Whistler, Roy L.

doi:10.1016/b978-0-08-092654-4.50007-3

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…Among the wide diversity of plant polysaccharides, some of them display characteristic rheological behaviors. , In many cases, these properties have made them especially suitable as additives for several industries. − The simple recuperation of the polymers constitutes frequently a principal key to their future uses. Thus, gums and mucilages represent an easy way to recover a large range of polysaccharides at a low cost .…”

Section: Introductionmentioning

confidence: 99%

Contributions of Intermolecular Interactions between Constitutive Arabinoxylans to the Flaxseeds Mucilage Properties

et al. 2005

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The main fraction (about 75%) of the mucilage extracted from seeds of Linum usitatissimum which consists of arabino-xylans (AX) has been studied in dilute and semidilute regimes by SEC/MALLS analysis and rheology, respectively. It has been found that AX contains 3 populations of about 5 000 000 g mol(-1) (less than 10%), 1 000 000 g mol(-1) (about 40%), and 200 000 g mol(-1) (about 50%). We have also observed a great retention of polymer during the filtration procedure, which is much pronounced as the AX concentration increases. This evidences the presence of large aggregates in the solution. The retention can be greatly diminished if the filtration is conducted under higher temperature. Aggregation could result from the establishment of intermolecular associations via hydrogen bonds. This hypothesis seems to be confirmed by the two higher populations in molar masses which present a random coil conformation consistent with a low degree of branching. Rheological measurements, conducted at 20 g L(-1), have confirmed the association tendency leading to pseudo gels behavior. Viscoelastic properties have been evidenced by time-temperature master curves of dynamic spectra. Such master curves have also been established with addition of chaotropic (i.e., KSCN) and lyotropic (i.e., NaCl) salts. It has been shown that intermolecular associations are greatly diminished under chaotropic salts influence. This has been also confirmed by SEC/MALLS analysis. These results point out the role of hydrogen bonds in the organization of the AX system.

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Section: Introductionmentioning

confidence: 99%

Contributions of Intermolecular Interactions between Constitutive Arabinoxylans to the Flaxseeds Mucilage Properties

et al. 2005

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“…Oleh karena itu, kekuatan gel yang dihasilkan turut meningkat [16]. NaOH mudah dalam mengeluarkan gugus 6-sulfat dari polimernya menjadi 3,6-anhidro-galaktosa yang mengakibatkan peningkatan nilai strength gel [17].…”

Section: Hasil Dan Pembahasanunclassified

PENGARUH WAKTU DAN SUHU MASERASI TERHADAP STRENGTH GEL KARAGINAN Eucheuma Cottonii DENGAN NaOH SEBAGAI PELARUT

Setyorini,

Syafaatullah,

Variyana

2022

JTKM

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Eucheuma cottonii merupakan salah satu jenis rumput laut yang paling banyak diproduksi di Indonesia. Tingginya angka penjualan rumput laut Eucheuma cottonii dalam bentuk bahan mentah, mengakibatkan diperlukannya pengolahan lebih lanjut untuk meningkatkan nilai jualnya. Salah satu produk rumput laut yang diminati yaitu karaginan yang dapat dimanfaatkan oleh industry pangan maupun non pangan karena dapat digunakan sebagai penstabil, pengemulsi, maupun gelatasi. Untuk mendapatkan karaginan, perlu dilakukan proses lanjutan yaitu ekstraksi. Terdapat berbagai jenis metode ekstraksi salah satunya yaitu maserasi (perendaman). Sebelum dilakukan maserasi, rumput laut sebaiknya dibersihkan dari kotoran – kotoran yang menempel untuk menghindari adanya kontaminasi sekaligus meningkatkan nilai kualitasnya. Solvent yang digunakan untuk proses maserasi sebaiknya merupakan solvent yang bersifat alkali, salah satunya yaitu NaOH. Waktu maserasi yang digunakan dalam penelitian ini yaitu selama 1 jam, 2 jam dan 3 jam. Sedangkan variasi suhu yang digunakan yaitu 60oC, 70oC dan 80oC. Hasil maserasi selanjutnya dikeringkan dan direduksi ukurannya. Untuk mengetahui kualitas dari karaginan yang dihasilkan, maka dilakukan Analisa viskositas dan strength gel. Dari penelitian ini dapat diketahui bahwa nilai strength gel akan berbanding terbalik dengan viskositas. Karaginan dengan mutu terbaik, dihasilkan melalui proses maserasi menggunakan NaOH pada suhu 70oC selama 1 jam dengan nilai strength gel nya sebesar 575 gr/cm2 dan viskositasnya 227 cp.

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“…Locust bean gum (LBG), also known as carob bean gum, is obtained from the endosperm of the seed of the locust (carob) tree, an evergreen of the legume family, Ceratonia siliqua L. LBG and its derivatives are broadly used in a variety of applications, such as the papermaking, mining and textile industries as well as in food processing [1]. Moreover, LBG is also commonly used in conjunction with other gums, such as guar gums, j-carrageenan gums [2], and xanthan gums [3] because of its unique swelling and water-binding properties.…”

Section: Introductionmentioning

confidence: 99%

Rheological and kinetic study of the ultrasonic degradation of locust bean gum in aqueous saline and salt-free solutions

Feke

2015

Ultrasonics Sonochemistry

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The ultrasonic degradation of locust bean gum (LBG) in aqueous solutions has been studied at 25°C for ultrasonication times up to 120 min. Although LBG is not a polyelectrolyte, the degradation extent and kinetics were found to be somewhat sensitive to the ionic conditions in solution, and this is attributed to changes in molecular conformation that can occur in different salt environments. Ultrasonic degradation was tracked by rheological measurements that lead to the determination of intrinsic viscosity for the LBG molecules. A kinetic model was also developed and successfully applied to characterize and predict the degradation results.

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Chemical Modification of Gums

Cited by 7 publications

References 11 publications

Contributions of Intermolecular Interactions between Constitutive Arabinoxylans to the Flaxseeds Mucilage Properties

Contributions of Intermolecular Interactions between Constitutive Arabinoxylans to the Flaxseeds Mucilage Properties

PENGARUH WAKTU DAN SUHU MASERASI TERHADAP STRENGTH GEL KARAGINAN Eucheuma Cottonii DENGAN NaOH SEBAGAI PELARUT

Rheological and kinetic study of the ultrasonic degradation of locust bean gum in aqueous saline and salt-free solutions

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