Bovine casein (>98%), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) were obtained from Sigma–Aldrich, Chemical Co. (St. Louis, MO, USA). Paclitaxel (>99%) and cis-diammineplatinum dichloride were purchased from Shanghai Macklin Biochemical Technology Co., Ltd. (Shanghai, China). Human malignant melanoma cells (A375) were purchased from Shanghai Institutes for Biological Sciences (Chinese Academy of Sciences). All materials for cell culture were obtained from Sangon Biotech (Shanghai) Co., Ltd., Shanghai, China. The preparation of specific-molecular-weight HA oligosaccharides (10,000 Da) was performed by using the methods mentioned in our previous study [12 (link),16 (link)]. High-molecular-weight HA was hydrolyzed by leech hyaluronidase, and the molecular weight of hydrolyzed HA was determined by high performance size exclusion chromatography. All other reagents were of analytical grade.
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